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Checklist of water mites (Acari: Hydrachnidia and Halacaridae) of the Baltic States

Smit, H.; van Haaren, T.; Tempelman, D.

Publication date 2010 Document Version Final published version Published in Latvijas Entomologs

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Citation for published version (APA): Smit, H., van Haaren, T., & Tempelman, D. (2010). Checklist of water mites (Acari: Hydrachnidia and Halacaridae) of the Baltic States. Latvijas Entomologs, 48, 52-75.

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Download date:29 Sep 2021 52 Checklists of Water Mites (Acari: Hydrachnidia and Halacaridae) of the Baltic States

Checklists of Water Mites (Acari: Hydrachnidia and Halacaridae) of the Baltic States

1 2 2 HARRY SMIT , TON VAN HAAREN , DAVID TEMPELMAN

1 - Zoological Museum, University of Amsterdam, Plantage Middenlaan 64, 1018-DH, Amsterdam, The Netherlands; e-mail [email protected] 2 - Grontmij|AquaSense, P.O. Box 95125, DH-1090 HC, Amsterdam, The Netherlands

SMIT H., VAN HAAREN T., TEMPELMAN D., 2010. CHECKLISTS OF WATER MITES (ACARI: HYDRACHNIDIA AND HALACARIDAE) OF THE BALTIC STATES. – Latvijas Entomologs , 48: 52-75.

Abstract: In this paper we give an overview of the water mites currently known from the Baltic countries. For each species all literature data are given and additionally many new data are provided. This work resulted in up-to-date checklists for Estonia, Latvia and Lithuania. Species numbers reported from Estonia, Latvia and Lithuania are 161, 162 and 137 respectively. It is expected that this number will rise considerably when more research is conducted.

Key words: Baltic, checklist, Hydrachnidia, water mites.

Introduction Võrtsjärv. A number of publications, i.e. Riikoja et al. (1973), Ristkok (1994), Timm et al. (1996) Research on water mites in the Baltic were repetitions of the earlier results. states of Estonia, Latvia and Lithuania started as The aim of this paper is to give an up-to- early as the mid 19 th century with a publication date listing of water mites of the three Baltic of Grube (1859). He listed nine species for the countries, including, the results of new fauna of Estonia. A second paper dealing with collections by the authors between 2005 and Estonian water mites was published by Von zur 2009. Mühlen & Schneider (1920). Ozolin (1925, 1930) was the first author to report on the water Methods mites of Latvia. He made an extensive inventory of the water mites of Latvia, examining 48 The taxonomy follows recent publications lakes, 42 streams and 59 ponds, ditches and of Davids et al. (2006), Gerecke (2003, 2009) other small water bodies. Ozolin (1930) listed and Di Sabatino et al. (2009, 2010). For every 133 species of water mites for the fauna of species all previous references are given, as well Latvia. The first author publishing a paper on as new records. Numbers for each species are the water mites of Lithuania was Čeraška given as male/female/deutonymph, or (1932). During the years 1927-1931 he collected adult/deutonymph. A complete list of locations water mites in Lithuania from some 75 is given in Annex 1, and the abbreviations given locations, including lakes, streams, pools, for each record can be found here. ditches and bogs. Čeraška (1932) listed 109 species of water mites for the fauna of Abbreviations used: Lithuania. th NP = National Park; NR = Nature Reserve, P-4 = fourth It was not until the second half of the 20 palp segment, Vgl 1 = ventroglandularia 1, La1 = Latvia1, century that water mites of the Baltic States Li2 = Lithuania2, E3 = Estonia3. The material is lodged were the subject of new publications. Lissenko in the Zoological Museum of the University of (1956, 1958, 1962) reported on the water mite Amsterdam or in the collection of the authors. fauna of Estonia, and Jankowskaja (1959) on the water mite fauna of Latvia. Most of the publications on the water mites of Estonia dealt with two lakes only, Lake Peipsi and Lake

Latvijas Entomologs 2010, 48: 52-75. 53

Systematic part 122; Timm et al. 1996: 151; Timm et al. 1999: 149; Timm et al. 2001: 98. Latvia: Ozolin 1930: Hydrachnidia 259, 260. Latvia: Jankowskaja 1959: 202. Family Hydrachnidae LEACH Lithuania: Čeraška 1932: 11. Hydrachna comosa KOENIKE , 1896 New records. Latvia. 1/0/0, La33; 1/0/0, La31. Previous records. Latvia: Ozolin 1930: 259. Lithuania: Čeraška 1932: 11. Hydrachna leegei KOENIKE , 1895 Syn.: Hydrachna leegei punctoscutata Hydrachna conjecta KOENIKE , 1895 LUNDBLAD , 1920 Syn.: Hydrachna conjecta dissecta VIETS , 1911 Previous records. Latvia: Ozolin 1930: 259, Previous records. Estonia: Nordenskiöld 1913: 260. Lithuania: Čeraška 1932: 11. 95; Von zur Mühlen & Schneider 1920: 23; New records. Estonia. 0/3/0, E22. Lithuania: Lissenko 1956: 187; 1962: 155; Riikoja et al. 2/1/0, Li14; 1/0/0, Li23; 1/0/0, Li25; 3/0/0, 1973: 211; Ristkok 1994: 122. Latvia: Ozolin Li28. 1930: 259. Remarks. Reported here for the first time for Estonia. Hydrachna crassipalpis PIERSIG , 1897 Previous records. Lithuania: Čeraška 1932: 11. Hydrachna processifera KOENIKE , 1903 New records. Lithuania. 1/0/0, Li7. Syn.: Hydrachna bimaculata KOENIKE , 1908 Previous records. Estonia: Lissenko 1956: 187; Hydrachna cruenta MÜLLER , 1776 1962: 155; Ristkok 1994: 122. Latvia: Ozolin Syn.: Hydrachna schneideri scutata PIERSIG , 1930: 260. Lithuania: Čeraška 1932: 12. 1897 Previous records. Estonia: Lissenko 1956: 187; Hydrachna skorikowi PIERSIG , 1900 1962: 155; Ristkok 1994: 122. Latvia: Ozolin Syn.: Hydrachna schneideri KOENIKE , 1895; 1930: 260. Lithuania: Čeraška 1932: 10. Hydrachna valida valida KOENIKE , 1914 Previous records. Latvia: Ozolin 1930: 260. Hydrachna cf. extorris KOENIKE , 1897 Lithuania: Čeraška 1932: 10. New records. Estonia. 1/0/0, E28. Remarks. Reported here for the first time for Family Limnocharidae GRUBE Estonia. The specimen reported here differs Limnochares (Limnochares) aquatica from H. processifera in a long rostrum, the low (LINNAEUS , 1758) number of setae on the fourth coxal plates and a Syn.: Limnochares holosericea (DEGEER , 1778) not very slender palp. The description is close to Previous records. Estonia: Lissenko 1956: 187; the enigmatic H. extorris , of unknown origin 1962: 155; Ristkok & Ruse 1962: 11; T. Timm (Davids et al. 2005). More material is needed to 1965: 96; Riikoja et al. 1973: 211; Koplan-Diks clarify the taxonomy of this species. & Stravinskaja 1980: 88; Ristkok 1994: 123. Latvia: Ozolin 1930: 258; Jankowskaja 1959: Hydrachna geographica MÜLLER , 1776 202. Lithuania: Čeraška 1932: 8. Previous records. Latvia: Ozolin 1930: 260. New records. Estonia. 3/0, E7; 0/0/1, E10; 1/0, Lithuania: Čeraška 1932: 11. E14; 0/0/1, E17; 1/0, E21; 1/1, E23; 5/4, E28. New records. Latvia. 2/0, La3. Lithuania. 1/0/0, Latvia. 2/0, La17; 6/0, La18; 1/0, La22; 4/0, Li24. La26; 0/1, La29. Lithuania. 3/1, Li5; 5/2, Li6; 1/0, Li11; 5/0, Li29. Hydrachna globosa (DEGEER , 1778) Syn.: Hydrachna uniscutata THOR , 1897; Family Eylaidae Leach Hydrachna uniscutata paludosa THON , 1899; Eylais curvipons SOKOLOW , 1922 Hydrachna uniscutata separata VIETS , 1919; Previous records. Lithuania: Čeraška 1932: 10. Hydrachna uniscutata sinuata SOKOLOW , 1931. Previous records. Estonia: Grube 1859: 52; Eylais discreta KOENIKE , 1897 Lissenko 1956: 187; 1962: 155; Ristkok 1994: Previous records. Estonia: Lissenko 1956: 187; 54 Checklists of Water Mites (Acari: Hydrachnidia and Halacaridae) of the Baltic States

1962: 155; Ristkok 1994: 122. Latvia: Ozolin 1962: 155; Ristkok 1994: 122. 1930: 259. New records. Latvia. 0/1/0, La6. New records. Latvia. 0/14/0, La28; 0/2/0, La29. Remarks. Reported here for the first time for Latvia. Eylais extendens (MÜLLER , 1776) Syn.: Eylais alutacea KOCH , 1837; Eylais Eylais setosa KOENIKE , 1897 undulosa KOENIKE , 1897; Eylais limnophila Previous records. Estonia: Lissenko 1962: 155. PIERSIG , 1899; Eylais soari PIERSIG , 1899; Latvia: Jankowskaja 1959: 206. Eylais rimosa PIERSIG , 1899. New records. Latvia. 0/5/0, La31. Previous records. Estonia: Grube 1859: 53; Nordenskiöld 1913: 95; Von zur Mühlen & Eylais tantilla KOENIKE , 1897 Schneider 1920: 23; Lissenko 1956: 187; 1958: Syn.: Eylais setosa tantilla KOENIKE , 1897 186; 1962: 155; T. Timm 1965: 96; Riikoja et Previous records. Estonia: Nordenskiöld 1913: al. 1973: 211; Ristkok 1994: 122. Latvia: Ozolin 95; Von zur Mühlen & Schneider 1920: 23; 1930: 259; Jankowskaja 1959: 206. Lithuania: Lissenko 1956: 187; 1962: 155; Riikoja et al. Čeraška 1932: 9. 1973: 211; Ristkok 1994: 122. New records. Lithuania. 1/0, Li11; 2/0, Li29. New records. Estonia. 2/1/0, E25; 0/1/0, E27. Lithuania. 1/0/0, Li28. Eylais hamata KOENIKE , 1897 Remarks. Reported here for the first time for Previous records. Estonia: Nordenskiöld 1913: Lithuania. 95; Von zur Mühlen & Schneider 1920: 23; Lissenko 1956: 187; 1962: 155; Riikoja et al. Eylais triarcuata PIERSIG , 1899 1973: 211; Ristkok 1994: 122. Latvia: Ozolin Previous records. Latvia: Ozolin 1930: 259. 1930: 258; Jankowskaja 1959: 206. Lithuania: Čeraška 1932: 8. Eylais tullgreni THOR , 1899 New records. Latvia. 1/0, La18. Lithuania. 1/0, Previous records. Estonia: Lissenko 1956: 187; Li11; 1/0, Li20. 1958: 186; 1962: 155; Riikoja et al. 1973: 211; Ristkok 1994: 122. Eylais infundibulifera KOENIKE , 1897 Previous records. Estonia: Lissenko 1956: 187; Family Hydryphantidae PIERSIG 1962: 155; Ristkok 1994: 122. Latvia: Euthyas truncata (NEUMAN , 1875) Jankowskaja 1959: 206. Lithuania: Čeraška Syn.: Thyas truncata (NEUMAN , 1875) 1932: 9. Previous records. Estonia: Lissenko 1956: 187; 1962: 155; Ristkok 1994: 122. Latvia: Ozolin Eylais koenikei HALBERT , 1903 1930: 261. Lithuania: Čeraška 1932: 12. New records. Lithuania. 1/0/0, Li7. New records. Estonia. 1/0, E4; 1/0, E5; 5/0, Remarks. Previously, not recorded from the E18; 8/0, E22; 1/0, E25; 2/2, E26. Latvia. 2/0, Baltic countries and reported here for the first La34. Lithuania: 1/0, Li7; 2/0, Li23; 1/0, Li30. time for Lithuania. Hydryphantes (Hydryphantes) crassipalpis Eylais mutila KOENIKE , 1897 KOENIKE , 1914 Syn.: Eylais cordifera VIETS , 1919 Previous records. Estonia: Lissenko 1956: 188; Previous records. Estonia: Lissenko 1962: 155. 1962: 155; Ristkok 1994: 122. Latvia: Latvia: Ozolin 1930: 259. Lithuania: Čeraška Jankowskaja 1959: 207. 1932: 9. New records. Lithuania. 1/0, Li19. Hydryphantes (Hydryphantes) dispar (SCHAUB , 1888) Eylais relicta HALBERT , 1911 Syn.: Hydryphantes dubius KOENIKE , 1916 Syn.: Eylais stagnaliformes SOKOLOW , 1937 – Previous records. Estonia: Lissenko 1956: 188; Davids et al. (2006). 1962: 155; Ristkok 1994: 122. Latvia: Ozolin Previous records. Estonia: Lissenko 1956: 187; 1930: 261. Lithuania: Čeraška 1932: 15. Latvijas Entomologs 2010, 48: 52-75. 55

New records. Estonia. 1/0, E19. Latvia. 1/0, Previous records. Lithuania: Čeraška 1932: 13. La18; 1/0, La22; 1/0, La25; 1/0, La29. New records. Lithuania: 0/1/0, Li17.

Hydryphantes (Hydryphantes) placationis Protzia eximia (PROTZ , 1896) THON , 1899 New records. Estonia. 2/0/0, E16. Previous records. Latvia: Ozolin 1930: 261. Remarks. Previously, not recorded from the Lithuania: Čeraška 1932: 15. Baltic countries and reported here for the first New records. Estonia. 1/0, E27. time for Estonia. Remarks. Reported here for the first time for Estonia. Thyopsis cancellata (PROTZ , 1896) Previous records. Estonia: Lissenko 1962: 155. Hydryphantes (Hydryphantes) planus THON , Latvia: Jankowskaja 1959: 207. 1899 Previous records. Latvia: Jankowskaja 1959: Parathyas barbigera (VIETS , 1908) 208. Syn.: Thyas barbigera VIETS , 1908 New records. Estonia. 4/0, E26. Latvia. 6/0, Previous records. Estonia: Lissenko 1962: 155. La30. Latvia: Jankowskaja 1959: 207. Lithuania: Remarks. Reported here for the first time for Čeraška 1932: 13. Estonia. New records. Lithuania: 3/1, Li7; 6/0, Li14; 4/0, Li30. Hydryphantes (Hydryphantes) ruber (DEGEER , 1778) Parathyas dirempta (KOENIKE , 1912) Syn.: Hydryphantes ornatus GRUBE , 1859; Syn.: Thyas dirempta KOENIKE , 1912 Hydryphantes plicatulus KOCH , 1842; Previous records. Latvia: Jankowskaja 1959: Hydryphantes puniceus KOCH , 1842; 207. Lithuania: Čeraška 1932: 14. Hydryphantes hellichi (THON , 1899); Hydryphantes ruber prolongatus THON , 1899; Parathyas pachystoma (KOENIKE , 1914) Hydryphantes hellichi auriculatus VIETS , 1919. Syn.: Thyas vietsi Koenike, 1914 Previous records. Estonia: Grube 1859: 53; Previous records. Estonia: Lissenko 1962: 155; Lissenko 1956: 187; 1962: 155; Ristkok 1994: Ristkok 1994: 124. Latvia: Ozolin 1930: 261. 122. Latvia: Ozolin 1930: 261; Jankowskaja New records. Estonia. 4/0, E6; 6/0, E18; 8/0, 1959: 207, 208. Lithuania: Čeraška 1932: 14. E26. Latvia. 1/0, La15; 1/0, La35. Lithuania: New records. Estonia. 3/0, E3; 1/0, E4; 1/0, 1/0, Li9; 1/2/0, Li17; 1/0, Li23. E11; 8/3, E12; 11/2, E18; 6/0, E19; 2/0, E22; Remarks. Reported here for the first time for 2/0, E25; 6/0, E26; 2/0, E27. Latvia. 1/0, La11; Lithuania. 8/12, La27; 10/1, La30; 4/2, La34. Lithuania. 7/22, Li7; 1/0, Li13; 16/13, Li14; 11/1, Li17; Parathyas palustris KOENIKE , 1912 2/1, Li18; 1/0, Li19; 20/5, Li23; 7/4, Li25; 1/0, Syn.: Thyas rivalis KOENIKE , 1912 Li27; 1/3, Li28. Previous records. Lithuania: Čeraška 1932: 14.

Hydryphantes (Polyhydryphantes) octoporus Thyasides dentatus (THOR , 1897) KOENIKE , 1896 Syn.: Thyas dentata dubia LUKIN , 1928 Syn.: Hydryphantes thoni Piersig, 1900 Previous records. Lithuania: Čeraška 1932: 13. Previous records. Latvia: Ozolin 1930: 262. Lithuania: Čeraška 1932: 16. Pseudohydryphantes parvulus VIETS , 1907 New records. Estonia. 3/0, E2. Previous records. Latvia: Ozolin 1930: 262. Remarks. Reported here for the first time for Estonia. Family Hydrodromidae VIETS Hydrodroma despiciens (MÜLLER , 1776) Parathyas thoracata (PIERSIG , 1896) Syn.: Diplodontus despiciens (MÜLLER , 1776) Syn.: Thyas thoracata PIERSIG , 1896 Previous records. Estonia: Lissenko 1956: 188; 56 Checklists of Water Mites (Acari: Hydrachnidia and Halacaridae) of the Baltic States

1958: 186; 1962: 156; Ristkok & Ruse 1962: Lithuania. 10; T. Timm 1965: 96; Riikoja et al. 1973: 211; Koplan-Diks & Stravinskaja 1980: 90; Ristkok Sperchon (Hispidosperchon) compactilis 1994: 122. Latvia: Ozolin 1930: 262; KOENIKE , 1911 Jankowskaja 1959: 208. Lithuania: Čeraška New records. Latvia. 1/0, La4. 1932: 16. Remarks. Previously not recorded from the New records. Estonia. 4/0, E21; 6/0, E28. Baltic countries and reported here for the first Latvia. 8/0, La1; 2/0, La17; 11/0, La18; 13/0, time for Latvia. La23; 8/0, La22; 1/0, La26; 2/0, La28; 2/0, La31; 4/0, La32; 10/0, La33; Lithuania. 1/0, Sperchon (Hispidosperchon) papillosus Thor, Li5; 1/0, Li6; 3/0, Li11; 9/0, Li15; 1/0, Li19; 1901 10/0, Li24; 10/0, Li29. Previous records. Latvia: Jankowskaja 1959: Remarks. It is most likely that previous records 209. of H. despiciens may refer to H. pilosa or H. New records. Latvia. 1/0, La14. torrenticola . Sperchon (Hispidosperchon) setiger THOR , Hydrodroma pilosa BESSELING , 1940 1898 New records. Latvia. 6/0, La17; 8/0, La28; 1/0, Previous records. Latvia: Ozolin 1930: 261. La31; 4/0, La32; 1/0, La35. Lithuania. 5/0, Li9; New records. Lithuania. 1/2/0, Li1; 0/1/0, Li10. 9/0, Li11; 4/0, Li15; 7/0, Li31. Remarks. Reported here for the first time for Remarks. Previously not recorded from the Lithuania. Baltic countries and reported here for the first time for Latvia and Lithuania. Sperchonopsis verrucosa (PROTZ , 1896) Previous records. Estonia: Lissenko 1956: 188; Hydrodroma torrenticola (WALTER , 1908) 1962: 156; Ristkok 1994: 124. Latvia: New records. Estonia. 2/0, E8; 1/0, E29. Jankowskaja 1959: 209. Remarks. Previously not recorded from the New records. Estonia. 0/1/1, E13; 2/3/0, E16; Baltic countries and reported here for the first 2/0/0, E23. Latvia. 2/0, La24. Lithuania. 1/4/0, time for Estonia. Li22. Remarks. Reported here for the first time for Family Sperchontidae THOR Lithuania. Sperchon (Sperchon) glandulosus KOENIKE , 1886 Family Teutoniidae KOENIKE Previous records. Latvia: Ozolin 1930: 261. Teutonia cometes (KOCH , 1837) Syn.: Teutonia primaria KOENIKE , 1889 Sperchon (Sperchon) squamosus Kramer, 1879 Previous records. Estonia: Lissenko 1956: 188; Previous records. Lithuania: Čeraška 1932: 12. 1962: 156; Ristkok 1994: 124. Latvia: Ozolin 1930: 262. Sperchon (Hispidosperchon) clupeifer PIERSIG , New records. Latvia. 1/1/0, La8. Lithuania. 1896 1/7/0, Li21. Syn.: Sperchon elegans THOR , 1898; Sperchon Remarks. Reported here for the first time for thori KOENIKE , 1901; Sperchon undulosus Lithuania. KOENIKE , 1908. Previous records. Estonia: Lissenko 1956: 188; Family Lebertiidae THOR 1962: 156; Ristkok 1994: 124. Latvia: Lebertia (Lebertia) glabra THOR , 1897 Jankowskaja 1959: 208, 209. Syn.: Lebertia lineata THOR , 1906 New records. Estonia. 2/0, E1; 0/2/0, E16; Previous records. Latvia: Jankowskaja 1959: 1/0/0, E23. Latvia. 1/0, La4; 0/2/0, La16; 2/0, 213. La14; 3/11/0, La24. Lithuania. 0/3/0, Li1; 1/0/0, Li4; 0/19/0, Li10; 0/1/0, Li16. Lebertia (Lebertia) natans K.VIETS , 1926 Remarks. Reported here for the first time for New records. Lithuania. 0/1/0, Li1; 0/1/0, Li4; Latvijas Entomologs 2010, 48: 52-75. 57

1/3/0, Li21. New records. Estonia. 0/1/0, E23. Latvia. 4/0, Remarks. Previously not recorded from the La4; 7/0, La6. Baltic countries and reported here for the first Remarks. Reported here for the first time for time for Lithuania. Estonia.

Lebertia (Lebertia) ignatowi SOKOLOW , 1930 Lebertia (Pilolebertia) porosa THOR , 1900 Previous records. Estonia: Lissenko 1958: 187; Syn.: Lebertia stackelbergi SOKOLOW , 1934; Riikoja et al. 1973: 211. Lebertia pachydermis KOENIKE , 1908; Lebertia caucasica SOKOLOW , 1927 Lebertia (Lebertia) oblonga KOENIKE , 1911 Previous records. Estonia: Lissenko 1956: 188; New records. Latvia. 5/0, La14. 1958: 187; 1962: 156; Riikoja et al. 1973: 211; Remarks. Previously not recorded from the Ristkok 1994: 123; Timm et al. 1996: 151; Baltic countries and reported here for the first Timm et al. 1999: 149; Timm et al. 2001: 98. time for Latvia. Latvia: Ozolin 1930: 262; Jankowskaja 1959: 210, 212. Lithuania: Čeraška 1932: 17. Lebertia (Lebertia) reticulata KOENIKE , 1919 New records. Estonia. 2/0, E1. Latvia. 33/0 , Syn.: Lebertia rufipes reticulata KOENIKE , 1919 La12. Lithuania. 1/0/0, Li26. Previous records. Estonia: Lissenko 1962: 156; Ristkok 1994: 123. Lebertia (Mixolebertia) halberti KOENIKE , 1902 Syn.: Lebertia schmidtii THOR , 1911 Lebertia (Lebertia) rivulorum K.VIETS , 1933 Previous records. Estonia: Lissenko 1956: 188; Previous records. Estonia: Lissenko 1956: 188; Ristkok 1994: 123. 1962: 156; Ristkok 1994: 123. Family Oxidae K.VIETS Lebertia (Mixolebertia) halberti KOENIKE , 1902 Oxus carpenteri (HALBERT , 1911) Previous records. Estonia: Lissenko 1962: 156. New records. Lithuania. 8/0, Li15. Remarks. Previously not recorded from the Lebertia (Pilolebertia) inaequalis (KOCH , 1837) Baltic countries and reported here for the first Syn.: Lebertia riabuschinkskii THOR , 1926; time for Lithuania. Lebertia exuta KOENIKE , 1908 Previous records. Estonia: Lissenko 1956: 188; Oxus musculus (MÜLLER , 1776) 1958: 187; 1962: 156; Ristkok & Ruse 1962: Syn.: Frontipoda musculus (MÜLLER , 1776) 11; Riikoja et al. 1973: 211; Ristkok 1994: 123; Previous records. Estonia: Lissenko 1956: 188; Timm et al. 1996: 151; Timm et al. 1999: 149. 1958: 187; 1962: 156; Ristkok & Ruse 1962: Latvia: Jankowskaja 1959: 210, 211. Lithuania: 10; T. Timm 1965: 96; Riikoja et al. 1973: 211; Čeraška 1932: 17. Ristkok 1994: 122; Timm et al. 1996: 151; New records. Latvia. 0/1/0, La6; 0/1/0, La7; 3/0 , Timm et al. 1999: 149; Timm et al. 2001: 98. La12. Latvia: Ozolin 1930: 263. Lithuania: Čeraška 1932: 17. Lebertia (Pilolebertia) insignis NEUMAN , 1880 New records. Latvia. 1/0, La26; 1/0, La35. Previous records. Estonia: Lissenko 1956: 188; Lithuania. 1/0, Li24. 1962: 156; Ristkok 1994: 123. Latvia: Ozolin 1930: 262; Jankowskaja 1959: 211. Lithuania: Oxus nodigerus KOENIKE , 1898 Čeraška 1932: 16. Previous records. Latvia: Ozolin 1930: 262. New records. Estonia. 2/0/0, E23. Latvia. 13/0, New records. Estonia. 1/0, E18. La4; 4/0/0, La5; 51/0, La6; 1/0/0, La7; 8/0, La8; Remarks. Reported here for the first time for 13/0, La14; 0/1/0, La21; 1/0/0, La24. Lithuania. Estonia. 4/2/0, Li1; 0/1/0, Li4; 1/1/0, Li21. Oxus ovalis (MÜLLER , 1776) Lebertia (Pilolebertia) pilosa MAGLIO , 1924 Previous records. Estonia: Lissenko 1956: 188; Previous records. Latvia. Gerecke 2009: 81. 1958: 187; 1962: 156; Ristkok & Ruse 1962: 58 Checklists of Water Mites (Acari: Hydrachnidia and Halacaridae) of the Baltic States

11; Riikoja et al. 1973: 211; Koplan-Diks & 1994: 123. Latvia: Ozolin 1930: 263. Lithuania: Stravinskaja 1980: 88; Ristkok 1994: 123. Čeraška 1932: 18. Latvia: Ozolin 1930: 262. New records. Estonia. 0/4/0, E18. Latvia. 0/1/0, New records. Lithuania. 1/0, Li6; 2/0, Li11. La17; 0/6/0, La18. Lithuania. 0/1/0, Li11; 0/1/0, Remarks. Reported here for the first time for Li24; 0/2/0, Li29. Lithuania. Limnesia (Limnesia) fulgida KOCH , 1836 Oxus strigatus (MÜLLER , 1776) Syn.: Limnesia cyanipes KOCH , 1836; Limnesia Syn.: Oxus quadriporus PIERSIG , 1901 cinnamomea GRUBE , 1859 Previous records. Estonia: Lissenko 1962: 156. Previous records. Estonia: Grube 1859: 52; Latvia: Ozolin 1930: 263. Lithuania: Čeraška Lissenko 1962: 156; Riikoja et al. 1973: 211. 1932: 17. Latvia: Ozolin 1930: 263; Jankowskaja 1959: 213. Lithuania: Čeraška 1932: 18. Family Torrenticolidae PIERSIG New records. Estonia. 0/1/0, E17; 0/1/0, E24; Torrenticola (Torrenticola) abbreviata 9/10/0, E28. Latvia. 0/1/0, La1; 0/3/0, La8; (SOKOLOW , 1934) 3/2/0, La9; 1/1/0, La13; 0/1/0, La20; 0/1/0, Syn.: Atractides abbreviatus Sokolow, 1934 La23; 2/1/0, La26; 0/4/0, La33. Lithuania. 1/1/0, Previous records. Estonia: Lissenko 1956: 189; Li2; 0/1/0, Li6; 2/0/0, Li24. 1962: 156; Ristkok 1994: 121. Limnesia (Limnesia) koenikei PIERSIG , 1894 Torrenticola (Torrenticola) amplexa (KOENIKE , Previous records. Estonia: Von zur Mühlen & 1908) Schneider 1920: 23; Timm et al. 1996: 151; Syn.: Atractides amplexus Koenike, 1908 Timm et al. 1999: 149; Timm et al. 2001: 98. Previous records. Estonia: Lissenko 1956: 189; New records. Latvia. 5/6/0, La6; 3/4/0, La25. 1962: 156; Ristkok 1994: 121, 124. Latvia: Lithuania. 5/1/0, Li27. Ozolin 1930: 262; Jankowskaja 1959: 213. Remarks. Reported here for the first time for Lithuania: Čeraška 1932: 18. Latvia and Lithuania. New records. Estonia. 2/2/0, E13; 1/2/0, E15; 4/14/5, E23; 4/6/0, La24. Latvia. 3/0, La4; 1/0, Limnesia (Limnesia) maculata (MÜLLER , 1776) La6. Lithuania. 0/1/0, Li1; 1/1/0, Li3; 0/2/0, Syn.: Limnesia oblonga KOCH , 1836 Li4; 1/4/0, Li22; 1/2/0, Li26. Previous records. Estonia: Nordenskiöld 1913: 95; Grube 1859: 52; Von zur Mühlen & Torrenticola (Torrenticola) anomala (KOCH , Schneider 1920: 23; Lissenko 1956: 189; 1958: 1837) 187; 1962: 156; Ristkok & Ruse 1962: 11; T. Syn.: Atractides anomalus KOCH , 1837Previous Timm 1965: 96; V. Timm 1967: 160; Koplan- records. Estonia: Lissenko 1956: 189; 1962: Diks & Stravinskaja 1980: 90; Ristkok 1994: 156; Ristkok 1994: 121. Latvia: Jankowskaja 123; Timm et al. 1996: 151; Timm et al. 1999: 1959: 213. 149; Timm et al. 2001: 98. Latvia: Ozolin 1930: 263; Jankowskaja 1959: 213. Lithuania: Torrenticola (Torrenticola) brevirostris Čeraška 1932: 18 (laps. L. masculata ). (HALBERT , 1911) New records. Estonia. 2/7/0, E17. Latvia. 2/5/1, New records. Estonia. 1/2/0, E13; 0/1/0, E15; La1; 3/0/0, La9; 0/3/0, La17; 1/4/0, La20; 1/0/0, 3/1/0, La24. La22; 3/4/0, La26; 0/1/0, La28; 0/1/0, La33. Remarks. Reported here for the first time for Lithuania. 0/1/0, Li6; 2/2/0, Li9; 1/0/0, Li11; Estonia. 1/1/0, Li15; 0/1/0, Li29; 3/3/0, Li31.

Family Limnesiidae THOR Limnesia (Limnesia) polonica SCHECHTEL , 1910 Limnesia (Limnesia) connata KOENIKE , 1895 New records. Latvia. 0/3/0, La1; 0/4/0, La22. Previous records. Estonia: Lissenko 1956: 189; Lithuania. 0/3/0, Li11; 0/2/0, Li15; 0/3/0, Li24. 1962: 156; Ristkok & Ruse 1962: 11; T. Timm Remarks. Previously not recorded from the 1965: 96; Riikoja et al. 1973: 211; Ristkok Baltic countries and reported here for the first Latvijas Entomologs 2010, 48: 52-75. 59 time for Latvia and Lithuania Remarks. Reported here for the first time for Lithuania. Limnesia (Limnesia) undulata (MÜLLER , 1776) Previous records. Estonia: Nordenskiöld 1913: Atractides (Atractides) ovalis KOENIKE , 1883 95; Von zur Mühlen & Schneider 1920: 23; Syn.: Megapus ovalis (KOENIKE , 1883) Lissenko 1956: 189; 1958: 187; 1962: 156; T. Previous records. Estonia: Ristkok 1994: 123. Timm 1965: 96; Ristkok & Ruse 1962: 11; V. Latvia: Ozolin 1930: 264; Jankowskaja 1959: Timm 1967: 160; Ristkok 1994: 123; Timm et 215. al. 1996: 151; Timm et al. 1999: 149; Timm et New records. Latvia. 0/2/0, La1. Lithuania. al. 2001: 98. Latvia: Ozolin 1930: 263; 0/1/0, Li11; 0/1/0, Li19; 0/9/0, Li24. Jankowskaja 1959: 214; Koplan-Diks & Remarks. Reported here for the first time for Stravinskaja 1980: 94. Lithuania: Čeraška 1932: Lithuania. 18. New records. Latvia. 0/1/0, La15; 0/1/0, La26. Atractides (Atractides) robustus (SOKOLOW , Lithuania. 0/16/0, Li9; 3/7/0, Li31. 1940) Remarks. Very likely the old records of this Syn.: Atractides (Atractides) nodipalpis species refer to either L. undulata or L. robustus (SOKOLOW , 1940) undulatoides . Previous records. Latvia: Jankowskaja 1959: 214. Limnesia (Limnesia) undulatoides DAVIDS , 1997 Atractides (Atractides) spinipes KOCH , 1837 New records. Estonia. 0/1/0, E17. Latvia. 0/1/0, Previous records. Latvia: Ozolin 1930: 264; La17; 4/11/0, La31. Lithuania. 1/0/0, Li6; 0/1/0, Jankowskaja 1959: 214. Lithuania: Čeraška La26. 1932: 20. Remarks. Previously, not recorded from the Baltic countries and reported here for the first Atractides (Atractides) subasper KOENIKE , 1902 time for Estonia, Latvia and Lithuania. Previous records. Latvia: Jankowskaja 1959: 215. Family Hygrobatidae KOCH Atractides (Atractides) digitatus LUNDBLAD , Atractides (Tympanomegapus) acutirostris 1954 (MOTA et ANGELIER , 1927) New records. Estonia. 0/1/0, E13. New records. Estonia. 0/1/0, E23. Lithuania. Remarks. A remarkable record, as all other 0/1/0, Li3; 0/1/0, Li26. records are confined to Spain (Gerecke 2003). Remarks. Previously not recorded from the Reported here for the first time for Estonia. Baltic countries and reported here for the first time for Estonia and Lithuania. Atractides (Atractides) distans (K.VIETS , 1914) Previous records. Latvia: Ozolin 1930: 264. Atractides (Tympanomegapus) cf. pavesii New records. Lithuania. 1/0/0, Li1; 8/6/1, Li4; MAGLIO , 1905 14/47/0, Li16. Previous records. Latvia: Ozolin 1930: 264. Remarks. Reported here for the first time for New records. Estonia. 0/1/0, E23. Lithuania. Lithuania. 3/0/0, Li26. Remarks. The identification of the material Atractides (Atractides) nodipalpis (THOR , 1899) reported here is somewhat uncertain. The males Syn.: Megapus nodipalpis THOR , 1899 are intermediate between pavesii and Previous records. Estonia: Lissenko 1956: 189; longirostris , with a more slender P-4 and 1958: 187; 1962: 157; Riikoja et al. 1973: 212; separate Vgl-1/2. The species is new for the Ristkok 1994: 123. Latvia: Ozolin 1930: 264; fauna of Estonia and Lithuania. Jankowskaja 1959: 214. New records. Estonia. 4/3/0, E13; 2/1/0, E15. Hygrobates (Hygrobates) calliger PIERSIG , 1896 Latvia. 0/14/0, La24. Lithuania. 0/2/0, Li3. Previous records. Estonia: Lissenko 1956: 189; 60 Checklists of Water Mites (Acari: Hydrachnidia and Halacaridae) of the Baltic States

1962: 156; Ristkok 1994: 122. Latvia: Ozolin 1962: 157; Ristkok & Ruse 1962: 10; V. Timm 1930: 264; Jankowskaja 1959: 214. 1967: 160; Riikoja et al. 1973: 212; Ristkok New records. Estonia. 3/1/0, E13; 2/5/0, E23; 1994: 123; Timm et al. 1996: 152; Timm et al. 0/2/0, E29. Latvia. 7/5/0, La4; 2/0, La12; 10/0, 1999: 149; Timm et al. 2001: 98. La14; 2/2/0, La16; 6/6/0, La24. Lithuania. 7/8/0, New records. Latvia. 0/2/0, La4. Lithuania. Li1; 8/6/1, Li4; 0/4/0, Li3; 4/10/0, Li9; 8/5/0, 0/1/0, Li26. Li10; 3/0/0, Li16; 5/3/0, Li22; 5/14/5, Li26. Remarks. Reported here for the first time for Remarks. Reported here for the first time for Latvia and Lithuania. Lithuania. Hygrobates (Hygrobates) nigromaculatus Hygrobates (Hygrobates) fluviatilis (STRÖM , LEBERT , 1879 1768) Previous records. Estonia: Lissenko 1962: 157; Syn.: Hygrobates naicus (JOHNSTON , 18148); 1958: 187; Ristkok & Ruse 1962: 11; V. Timm Dictyobates fluviatilis (STRÖM , 1768); 1967: 160; Riikoja et al. 1973: 212; Koplan- Hygrobates reticulatus KOENIKE , 1892 Diks & Stravinskaja 1980: 91; Ristkok 1994: Previous records. Estonia: Lissenko 1956: 189; 122; Timm et al. 1996: 151; Timm et al. 1999: 1958: 187; 1962: 156; Riikoja et al. 1973: 212; 149; Timm et al. 2001: 98. Latvia: Ozolin 1930: Ristkok 1994: 121, 122. Latvia: Ozolin 1930: 264; Koplan-Diks & Stravinskaja 1980: 94. 264; Jankowskaja 1959: 214. Lithuania: Lithuania: Čeraška 1932: 19. Čeraška 1932: 19. New records. Estonia. 0/2/0, E16. Latvia. 1/0, New records. Estonia. 2/1/0, E23. Latvia. 1/2/0, La14; 1/0/0, La16. Lithuania. 0/1/0, Li1; 0/2/0, La4; 2/1/0, La6; 5/0, La8; 5/0, La12; 6/0, La14; Li9. 0/2/0, La16. Lithuania. 0/2/0, Li1; 4/12/0, Li26. Hygrobates (Hygrobates) sokolowi THOR , 1927 Hygrobates (Hygrobates) foreli (LEBERT , 1874) Previous records. Estonia: Lissenko 1956: 189; Previous records. Estonia: Lissenko 1956: 189; 1962: 157; Ristkok 1994: 122. 1962: 157; Ristkok & Ruse 1962: 10; Ristkok 1994: 122. Latvia: Jankowskaja 1959: 214. Hygrobates (Hygrobates) trigonicus KOENIKE , 1895 Hygrobates (Hygrobates) longipalpis Previous records. Estonia: Lissenko 1962: 157; (HERMANN , 1804) 1958: 187; Ristkok & Ruse 1962: 11; Riikoja et Syn.: Hygrobates varians Koch, 1837 (?). al. 1973: 212; Ristkok 1994: 123; Timm et al. Previous records. Estonia: Grube 1859: 52; 1996: 152; Timm et al. 1999: 149; Timm et al. Nordenskiöld 1913: 95; Von zur Mühlen & 2001: 98. Schneider 1920: 23; Lissenko 1956: 189; 1958: 187; 1962: 157; Ristkok & Ruse 1962: 10; T. Hygrobates (Rivobates) norvegicus (THOR , Timm 1965: 96; Riikoja et al. 1973: 212; 1897) Ristkok 1994: 122; Timm et al. 1996: 151; Previous records. Latvia: Ozolin 1930: 264. Timm et al. 1999: 149; Timm et al. 2001: 98. Latvia: Ozolin 1930: 263. Lithuania: Čeraška Family Unionicolidae OUDEMANS 1932: 19 (laps. H. longipalpus ). Neumania (Neumania) callosa (KOENIKE , 1895) New records. Estonia. 1/0, E3; 16/0, E8; 2/4/0, Previous records. Estonia: Lissenko 1956: 190; E17; 0/1/0, E29. Latvia. 2/3/0, La6; 0/1/0, La7. 1962: 157; Ristkok 1994: 123. Latvia: Ozolin Lithuania. 1/2/0, Li6; 5/20/0, Li9; 0/1/0, Li11; 1930: 265. 1/1/0, Li15; 0/1/0, Li21; 0/1/0, Li24; 2/5/0, Li27. Neumania (Neumania) deltoides (PIERSIG , 1894) Hygrobates (Hygrobates) longiporus THOR , Syn.: Neumania triangularis (PIERSIG , 1893) 1898 Previous records. Estonia: Lissenko 1962: 157; Syn.: Hygrobates squamifer THOR , 1898 Timm et al. 1996: 152; Timm et al. 1999: 149; Previous records. Estonia: Lissenko 1956: 189; Timm et al. 2001: 98. Latvia: Ozolin 1930: 265. Latvijas Entomologs 2010, 48: 52-75. 61

Previous records. Estonia: Lissenko 1956: 190; Neumania (Neumania) limosa (KOCH , 1836) 1958: 187; 1962: 157; Ristkok & Ruse 1962: Syn.: Neumania agilis KOENIKE , 1916 11; T. Timm 1965: 96; Riikoja et al. 1973: 212; Previous records. Estonia: Lissenko 1956: 190; Ristkok 1994: 124. Latvia: Ozolin 1930: 264. 1962: 157; Ristkok 1994: 123; Timm et al. Lithuania: Čeraška 1932: 19. 1996: 152; Timm et al. 1999: 149; Timm et al. New records. Estonia. 4/8/0, E20. Latvia. 0/2/0, 2001: 98. Latvia: Ozolin 1930: 265; La8; 1/2/0, La26; 0/2/0, La27; 0/9/0, La32. Jankowskaja 1959: 215. Lithuania. 0/1/0, Li19; 0/5/0, Li24. New records. Estonia. 0/1/0, E8. Latvia. 0/10/0, La25. Unionicola (Unionicola) figuralis (KOCH , 1836) Previous records. Estonia: Lissenko 1962: 157; Neumania (Neumania) martynowi SOKOLOW , Ristkok & Ruse 1962: 11; Riikoja et al. 1973: 1931 212. Lithuania: Čeraška 1932: 19. Previous records. Estonia: Riikoja et al. 1973: 212; Ristkok 1994: 123. Unionicola (Unionicola) gracilipalpis (K.VIETS , 1908) Neumania (Neumania) spinipes (MÜLLER , Previous records. Estonia: Lissenko 1956: 190; 1776) 1962: 157; Ristkok & Ruse 1962: 11; T. Timm Previous records. Estonia. T. Timm 1965: 96. 1965: 96; Riikoja et al. 1973: 212; Ristkok Latvia: Ozolin 1930: 265. Lithuania: Čeraška 1994: 124. Latvia: Ozolin 1930: 264. 1932: 20. New records. Estonia. 0/4/0, E20. Latvia. 0/2/0, New records. Estonia. 0/4/0, E20; 0/1/0, E24; La26; 0/1/0, La32. Lithuania. 0/1/0, Li6; 0/1/0, 0/1/0, E28. Latvia. 0/1/0, La32. Lithuania. 0/1/0, Li24. Li13; 0/1/0, Li27. Remarks. Reported here for the first time for Lithuania. Neumania (Neumania) vernalis (MÜLLER , 1776) Previous records. Estonia: Lissenko 1956: 190; Unionicola (Unionicola) minor (SOAR , 1900) 1958: 187; 1962: 157; Ristkok & Ruse 1962: New records. Latvia. 0/1/0, La6. Lithuania. 11; T. Timm 1965: 96; Riikoja et al. 1973: 212; 0/1/0, Li2. Koplan-Diks & Stravinskaja 1980: 88; Ristkok Remarks. Previously not recorded from the 1994: 123; Timm et al. 1996: 152; Timm et al. Baltic countries and reported here for the first 1999: 149; Timm et al. 2001: 98. Latvia: Ozolin time for Latvia and Lithuania 1930: 265; Jankowskaja 1959: 215. Lithuania: Čeraška 1932: 20. Unionicola (Unionicola) parvipora LUNDBLAD , New records. Estonia. 0/4/0, E7; 0/4/0, E17. 1920 Latvia. 0/7/0, La1; 0/1/0, La2; 0/2/0, La8; 0/8/0, Syn.: Unionicola gracilipalpis parvipora La17; 0/1/0, La18; 0/6/0, La22; 0/5/0, La32. LUNDBLAD , 1920 Lithuania. 0/5/0, Li2; 0/9/0, Li6; 0/2/0, Li11; Previous records. Latvia: Ozolin 1930: 265. 0/2/0, Li24. New records. Latvia. 0/90, La18.

Neumania (Soarella) papillosa (SOAR , 1902) Unionicola (Anodontinatax) intermedia Syn.: Neumania umbonata (KOENIKE , 1895) (KOENIKE , 1882) Previous records. Estonia: Lissenko 1956: 190; Previous records. Latvia: Ozolin 1930: 264. 1958: 187; 1962: 157; Riikoja et al. 1973: 212; Ristkok 1994: 123; Timm et al. 1996: 152; Unionicola (Parasitatax) ypsilophora (BONZ , Timm et al. 1999: 149; Timm et al. 2001: 98. 1783) Latvia: Ozolin 1930: 265. Previous records. Lithuania: Čeraška 1932: 20. New records. Latvia. 21/0, La6. Unionicola (Pentatax) aculeata (KOENIKE , Unionicola (Unionicola) crassipes (MÜLLER , 1890) 1776) Previous records. Estonia: Timm et al. 1996: 62 Checklists of Water Mites (Acari: Hydrachnidia and Halacaridae) of the Baltic States

152; Timm et al. 1999: 149; Timm et al. 2001: 0/4/0, Li29; 1/5/0, Li31. 98. Remarks. Reported here for the first time for Lithuania. Unionicola (Pentatax) bonzi (CLAPARÈDE , 1869) Hydrochoreutes ungulatus (KOCH , 1836) Previous records. Latvia: Ozolin 1930: 264. Previous records. Estonia: Lissenko 1956: 191; Lithuania: Čeraška 1932: 20. 1958: 188; 1962: 158; Riikoja et al. 1973: 212; Ristkok 1994: 122. Latvia: Ozolin 1930: 267. Family Pionidae THOR Lithuania: Čeraška 1932: 23. Forelia (Forelia) brevipes (NEUMAN , 1880) New records. Lithuania. 1/0/0, Li11. Piona alpicola (NEUMAN , 1880) Remarks. Previously not recorded from the Syn.: Piona uncata (KOENIKE , 1888); Piona Baltic countries and reported here for the first uncata controversia (PIERSIG , 1896); Piona time for Lithuania. controversia (PIERSIG , 1896) Previous records. Estonia: Lissenko 1962: 157; Forelia (Forelia) curvipalpis K.VIETS , 1930 1958: 188; Ristkok & Ruse 1962: 11; T. Timm New records. Lithuania. 0/1/0, Li11. 1965: 96; Riikoja et al. 1973: 212; Timm et al. Remarks. Previously not recorded from the 1996: 152; Timm et al. 1999: 150; Timm et al. Baltic countries and reported here for the first 2001: 98. Latvia: Ozolin 1930: 267; time for Lithuania. Jankowskaja 1959: 217. Lithuania: Čeraška 1932: 22 (laps P. centroversoria ). Forelia (Forelia) liliacea (MÜLLER , 1776) New records. Latvia. 2/4/0, La31. Lithuania. Previous records. Estonia: Lissenko 1956: 190; 1/0/0, Li27. 1958: 188; 1962: 157; Ristkok & Ruse 1962: 10; T. Timm 1965: 96; Riikoja et al. 1973: 212; Piona ambigua (PIERSIG , 1894) Koplan-Diks & Stravinskaja 1980: 88; Ristkok Syn.: Piona nodatoides SOKOLOW , 1926 1994: 122; Timm et al. 1996: 152; Timm et al. Previous records. Estonia: Lissenko 1962: 157. 1999: 149; Timm et al. 2001: 98. Latvia: Ozolin New records. Estonia. 10/10/0, E11; 0/3/0, E12; 1930: 265. Lithuania: Čeraška 1932: 20. 1/5/0, E26. Latvia. 0/5/0, La34. Lithuania. 0/3/0, Li7; 1/2/0, Li13; 0/7/0, Li14; 6/8/0, Li17; 0/5/0, Forelia (Forelia) variegator (KOCH , 1837) Li23; 0/13, Li25; 0/12/2, Li30. Syn.: Forelia parmata KOENIKE , 1906 Remarks. Reported here for the first time for Previous records. Estonia: Lissenko 1956: 190; Latvia and Lithuania. 1958: 188; 1962: 157; Riikoja et al. 1973: 212; Koplan-Diks & Stravinskaja 1980: 91; Ristkok Piona brehmi WALTER , 1910 1994: 122; Timm et al. 1996: 152; Timm et al. Syn.: Piona trisetica Thor, 1912 1999: 149; Timm et al. 2001: 98. Latvia: Ozolin Previous records. Estonia: Riikoja et al. 1973: 1930: 265. Lithuania: Čeraška 1932: 21. 212. New records. Estonia. 1/0/0, E16. Latvia. 0/2/0, La6. Piona carnea (KOCH , 1836) Previous records. Estonia: Lissenko 1962: 157. Huitfeldtia rectipes THOR , 1898 Latvia: Ozolin 1930: 267; Jankowskaja 1959: Previous records. Estonia: Lissenko 1962: 157. 216. Lithuania: Čeraška 1932: 22. New records. Estonia. 0/1/0, E7; 0/1/2, E28. Hydrochoreutes krameri PIERSIG , 1896 Previous records. Estonia: Lissenko 1956: 191; Piona clavicornis (MÜLLER , 1776) 1962: 158; Ristkok & Ruse 1962: 10; T. Timm Previous records. Estonia: Timm et al. 1996: 1965: 96; Riikoja et al. 1973: 212; Ristkok 152; Timm et al. 1999: 150; Timm et al. 2001: 1994: 122. Latvia: Ozolin 1930: 268. 98. Latvia: Ozolin 1930: 266. Lithuania: New records. Latvia. 0/2/0, La20; 0/5/0, La31; Čeraška 1932: 21. 0/1/0, La32; 0/7/0, La33. Lithuania. 1/0/0, Li6; New records. Estonia. 0/6/0, E4; 0/1/0, E12; Latvijas Entomologs 2010, 48: 52-75. 63

0/1/0, E20. Latvia. 0/2/0, La27. Lithuania. 0/6/0, Li13; 0/2/0, Li28. Piona imminuta (PIERSIG , 1897) Syn.: Piona coccinea imminuta (PIERSIG , 1897) Piona coccinea (KOCH , 1836) Previous records. Latvia: Ozolin 1930: 267. Syn.: Neseae coccinea KOCH , 1836; Piona longicornis (MÜLLER , 1776) Piona longipalpis (KRENDOWSKY , 1878) Previous records. Estonia: Grube 1859: 52; Previous records. Estonia: Lissenko 1956: 190; Lissenko 1956: 190; 1958: 188; 1962: 157; 1958: 188; 1962: 157; Ristkok & Ruse 1962: Ristkok & Ruse 1962: 11; T. Timm 1965: 96; 11; T. Timm 1965: 96; Riikoja et al. 1973: 212; Riikoja et al. 1973: 212; Ristkok 1994: 123; Koplan-Diks & Stravinskaja 1980: 88; Ristkok Timm et al. 1996: 152; Timm et al. 1999: 150; 1994: 123; Timm et al. 1996: 152; Timm et al. Timm et al. 2001: 98. Latvia: Ozolin 1930: 267; 1999: 150; Timm et al. 2001: 98. Latvia: Ozolin Jankowskaja 1959: 216; Koplan-Diks & 1930: 267; Jankowskaja 1959: 216. Lithuania: Stravinskaja 1980: 94. Lithuania: Čeraška 1932: Čeraška 1932: 22. 21, 22. New records. Estonia. 0/1/0, E20. Latvia. 0/1/0, New records. Estonia. 7/0/0, E17. Latvia. 0/2/0, La8; 0/1/0, La9; 0/1/0, La20; 0/1/0, La21; 1/2/0, La9; 1/0/0, La20; 1/0/0, La28; 0/1/0, La29. La28. Lithuania. 0/1/0, Li31. Lithuania. 0/1/0, Li11; 0/2/0, Li31. Piona neumani (KOENIKE, 1883) Piona coccinoides (THOR , 1897) Syn.: Piona circularis (PIERSIG , 1896) Previous records. Estonia: Lissenko 1956: 191; Previous records. Estonia: Lissenko 1962: 157; 1958: 188; 1962: 157; Riikoja et al. 1973: 212; Riikoja et al. 1973: 212; Ristkok 1994: 123; Ristkok 1994: 123; Timm et al. 1996: 152; Timm et al. 1996: 152; Timm et al. 1999: 149; Timm et al. 1999: 150; Timm et al. 2001: 98. Timm et al. 2001: 98. Latvia: Ozolin 1930: 266.

Piona conglobata (KOCH , 1836) Piona nodata (MÜLLER , 1776) Previous records. Estonia: Lissenko 1956: 190; Previous records. Estonia: Nordenskiöld 1913: 1958: 188; 1962: 157; T. Timm 1965: 96; 95; Von zur Mühlen & Schneider 1920: 23; Riikoja et al. 1973: 212; Ristkok 1994: 123; Lissenko 1956: 191; 1962: 157; Riikoja et al. Timm et al. 1996: 152; Timm et al. 1999: 150; 1973: 212; Ristkok 1994: 124; Timm et al. Timm et al. 2001: 98. Latvia: Ozolin 1930: 266; 1996: 152; Timm et al. 1999: 150; Timm et al. Jankowskaja 1959: 217. Lithuania: Čeraška 2001: 98. Latvia: Ozolin 1930: 266; 1932: 22. Jankowskaja 1959: 216. Lithuania: Čeraška New records. Latvia. 0/4/0, La31; 1/1/0, La32; 1932: 21. 0/1/0, La33. Lithuania. 1/0/0, Li19. New records. Estonia. 1/4/0, E12; 2/1/0, E20; 4/10/0, E25; 1/18/0, E27. Latvia. 1/0/0, La2; Piona conglobata conjugula KOENIKE , 1909 0/1/0, La10; 0/1/0, La19; 5/0/0, La21; 5/20/0, Previous records. Estonia: Lissenko 1962: 157. La27; 0/3/0, La31; 3/0/0, La35. Lithuania. 3/5/0, Latvia: Ozolin 1930: 266. Li14; 4/5/0, Li18; 6/3/1, Li27; 1/0/0, Li28.

Piona discrepans (KOENIKE , 1895) Piona obturbans (PIERSIG , 1896) Previous records. Estonia: Lissenko 1962: 158; Previous records. Estonia: Lissenko 1962: 157; Riikoja et al. 1973: 212. Latvia: Ozolin 1930: 1958: 188; Ristkok & Ruse 1962: 11; Riikoja et 266. al. 1973: 212; Timm et al. 1996: 152; Timm et al. 1999: 150; Timm et al. 2001: 98. Piona disparilis (KOENIKE , 1895) New records. Latvia. 0/1/0, La1; 3/5/0, La25; Previous records. Estonia: Lissenko 1962: 157; 0/2/0, La34. Lithuania. 1/0/0, Li28. Riikoja et al. 1973: 212. Remarks. Reported here for the first time for Latvia and Lithuania. Piona falcigera (KOENIKE , 1905) Previous records. Latvia: Ozolin 1930: 266. Piona paucipora (THOR , 1897) 64 Checklists of Water Mites (Acari: Hydrachnidia and Halacaridae) of the Baltic States

Previous records. Estonia: Lissenko 1962: 158; Syn.: Piona rufa (KOCH , 1836); Piona variabilis 1958: 188; Ristkok & Ruse 1962: 11; T. Timm dispersa SOKOLOW , 1926 1965: 96; Riikoja et al. 1973: 212; Ristkok Previous records. Estonia: Grube 1859: 52; 1994: 124. Lissenko 1956: 190; 1958: 188; 1962: 158; New records. Lithuania. 9/0/0, Li11. Ristkok & Ruse 1962: 11; T. Timm 1965: 96; Remarks. Reported here for the first time for V. Timm 1967: 160; Riikoja et al. 1973: 212; Lithuania. Ristkok 1994: 124; Timm et al. 1996: 152; Timm et al. 1999: 150; Timm et al. 2001: 98. Piona pusilla (NEUMAN , 1875) Latvia: Ozolin 1930: 266; Jankowskaja 1959: Syn.: Piona rotunda (KRAMER , 1879) 217. Lithuania: Čeraška 1932: 22. Previous records. Estonia: Nordenskiöld 1913: New records. Estonia. 16/1/0, E17. Latvia. 95; Von zur Mühlen & Schneider 1920: 23; 1/3/0, La2; 12/18/0, La17; 2/1/0, La20; 13/9/0, Lissenko 1956: 191; 1958: 188; 1962: 157; La23; 11/40/0, La22; 5/19/0, La26; 1/9/0, La28; Ristkok & Ruse 1962: 11; T. Timm 1965: 96; 0/1/0, La31. Lithuania. 0/1/0, Li5; 22/4/0, Li6; Riikoja et al. 1973: 212; Ristkok 1994: 124; 0/1/0, Li19; 8/17/0, Li29; 11/10/0, Li31. Timm et al. 1996: 152; Timm et al. 1999: 150; Timm et al. 2001: 98. Latvia: Ozolin 1930: 267; Pionacercus (Pionacercus) norvegicus THOR , Jankowskaja 1959: 216. Lithuania: Čeraška 1898 1932: 22. New records. Estonia. 0/1/0, E18. New records. Latvia. 1/0/0, La17; 4/1/0, La20; Remarks. Previously not recorded from the 5/35/0, La25; 1/0/0, La26; 0/3/0, La31; 2/32/0, Baltic countries and reported here for the first La32; 0/6/0, La33. Lithuania. 1/0/0, Li6; 3/0/0, time for Estonia. Li11; 4/1/0, Li24; 2/2/0, Li31. Pionacercus (Pionacercus) uncinatus Piona rotundoides (THOR , 1897) (KOENIKE , 1885) Previous records. Estonia: Lissenko 1956: 191; Previous records. Estonia: Lissenko 1956: 191; 1958: 188; 1962: 157; Ristkok & Ruse 1962: 1962: 158; Ristkok 1994: 124. 11; Riikoja et al. 1973: 212; Ristkok 1994: 124; Timm et al. 1996: 152; Timm et al. 1999: 150; Pionopsis lutescens (HERMANN , 1804) Timm et al. 2001: 98. Latvia: Ozolin 1930: 267. Syn.: Acercus lutescens (HERMANN , 1804) New records. Lithuania. 0/1/0, Li11. Previous records. Estonia: Lissenko 1956: 191; Remarks. Reported here for the first time for 1962: 158; Ristkok 1994: 124. Latvia: Ozolin Lithuania. 1930: 268; Jankowskaja 1959: 215. Lithuania: Čeraška 1932: 23. Piona stjoerdalensis (THOR , 1897) New records. Estonia. 2/5/0, E25. Latvia. 0/3/0, Syn.: Piona coccinea stjördalensis (THOR , La1; 0/3/0, La25; 0/1/0, La27; 0/4/0, La31; 1897); Piona coccinea occulta KOENIKE , 1914 0/1/0, La32; 5/15/0, La34. Lithuania. 1/0/0, Li6; Previous records. Estonia: Lissenko 1956: 190; 4/1/0, Li28; 1/0/0, Li32. 1958: 188; 1962: 157; Ristkok & Ruse 1962: 11; T. Timm 1965: 96; Riikoja et al. 1973: 212; Tiphys (Tiphys) bullatus (THOR , 1899) Ristkok 1994: 123; Timm et al. 1996: 152; Syn.: Acercus bullatus (THOR , 1899) Timm et al. 1999: 150; Timm et al. 2001: 98. Previous records. Estonia: Lissenko 1962: 158. Latvia: Ozolin 1930: 267. Latvia: Ozolin 1930: 268. New records. Lithuania. 0/1/0, Li9; 0/1/0, Li31. New records. Lithuania. 0/2/0, Li13. Remarks. Reported for the first time for Remarks. Reported here for the first time for Lithuania. Lithuania.

Piona tubifera VIETS , 1910 Tiphys (Tiphys) latipes (MÜLLER , 1776) Previous records. Latvia: Ozolin 1930: 267. Syn.: Acercus latipes (MÜLLER , 1776) Previous records. Estonia: Lissenko 1962: 158. Piona variabilis (KOCH , 1836) Latvia: Ozolin 1930: 268. Lithuania: Čeraška Latvijas Entomologs 2010, 48: 52-75. 65

1932: 23. Aturus scaber KRAMER , 1875 New records. Estonia. 1/7/0, E26. Lithuania. New records. Estonia. 0/1/0, E13. 0/4/0, Li14; 0/13/0, Li17. Remarks. Previously not recorded from the Baltic countries and reported here for the first Tiphys (Tiphys) ornatus KOCH , 1836 time for Estonia. Syn.: Acercus ornatus (KOCH , 1836) Previous records. Estonia: Lissenko 1956: 191; Axonopsis (Axonopsis) complanata (MÜLLER , 1962: 158; Ristkok 1994: 120. Latvia: Ozolin 1776) 1930: 268; Jankowskaja 1959: 215. Lithuania: Previous records. Latvia: Ozolin 1930: 269. Čeraška 1932: 23. New records. Lithuania. 0/1/0, Li15. New records. Estonia. 0/2/0, E12; 0/3/0, E25. Remarks. Reported here for the first time for Latvia. 0/2/0, La21; 0/1/0, La25; 0/2/0, La27; Lithuania. 0/1/0, La31; 0/7/0, La34; 0/1/0, La35. Lithuania. 0/2/0, Li7; 1/1/0, Li13; 3/2/0, Li17; 0/1/0, Li28. Axonopsis (Hexanopsis) romijni VIETS , 1923 Previous records. Latvia: Ozolin 1930: 269. Tiphys (Tiphys) scaurus (KOENIKE , 1892) Syn.: Acercus scaurus (KOENIKE , 1892) Barbaxonella angulata (VIETS , 1955) Previous records. Latvia: Ozolin 1930: 268. New records. Estonia. 0/1/0, E13;1/0/0, E15. Remarks. Previously not recorded from the Tiphys (Tiphys) torris (MÜLLER , 1776) Baltic countries and reported here for the first Syn.: Acercis torris (MÜLLER , 1776) time for Estonia. Previous records. Estonia: Lissenko 1956: 191; 1962: 158 Ristkok 1994: 120. Latvia: Ozolin Brachypoda (Brachypoda) versicolor (MÜLLER , 1930: 268. Lithuania: Čeraška 1932: 23. 1776) New records. Latvia. 0/2/0, La34. Previous records. Estonia: Lissenko 1956: 191; 1958: 188; 1962: 158; Ristkok & Ruse 1962: Tiphys (Acercopsis) pistillifer (KOENIKE , 1908) 10; Riikoja et al. 1973: 212; Ristkok 1994: 121; New records. Lithuania. 1/1/0, Li18. Timm et al. 1996: 152; Timm et al. 1999: 150; Remarks. Previously not recorded from the Timm et al. 2001: 98. Latvia: Ozolin 1930: 269. Baltic countries and reported here for the first Lithuania: Čeraška 1932: 24. time for Lithuania. New records. Estonia. 0/2/0, E17. Lithuania. 0/1/0, Li9; 0/19/3, Li15; 0/3/0, Li19; 0/4/0, Tiphys (Pionides) ensifer (KOENIKE , 1895) Li24. Syn.: Acercus ensifer (KOENIKE , 1895) Previous records. Latvia: Ozolin 1930: 268. Ljania bipapillata bipapillata THOR , 1898 New records. Estonia. 1/0/0, E4; 1/0/0, E26. New records. Estonia. 1/1/0, E23. Lithuania. Remarks. Reported here for the first time for 0/1/0, Li22. Estonia. Remarks. Previously not recorded from the Baltic countries and reported here for the first Family Aturidae THOR time for Estonia and Lithuania. Albia (Albia) stationis THON , 1899 Previous records. Estonia: Lissenko 1956: 191; Ljania macilenta KOENIKE , 1908 1962: 158; Ristkok 1994: 120. New records. Estonia. 0/2/0, E29. Remarks. Previously not recorded from the Aturus fontinalis LUNDBLAD , 1920 Baltic countries and reported here for the first Previous records. Latvia: Ozolin 1930: 269. time for Estonia.

Aturus natangensis PROTZ , 1900 Neobrachypoda ekmani (WALTER , 1911) Previous records. Estonia: Lissenko 1956: 191; Previous records. Estonia: Lissenko 1956: 191; 1962: 158; Ristkok 1994: 121. 1962: 158; Ristkok 1994: 123.

66 Checklists of Water Mites (Acari: Hydrachnidia and Halacaridae) of the Baltic States

Family Mideidae THOR time for Estonia, Latvia and Lithuania. Midea orbiculata (MÜLLER , 1776) Previous records. Estonia: Lissenko 1956: 192; Family Krendowskiidae K.VIETS 1958: 189; 1962: 158; Ristkok & Ruse 1962: Krendowskia (Krendowskia) latissima PIERSIG , 11; T. Timm 1965: 96; Ristkok 1994: 123; 1895 Timm et al. 1996: 152; Timm et al. 1999: 150; Previous records. Estonia: Lissenko 1956: 192; Timm et al. 2001: 98. Latvia: Ozolin 1930: 268; 1962: 158; Ristkok 1994: 123. Jankowskaja 1959: 217. Lithuania: Čeraška 1932: 24. Family Arrenuridae THOR New records. Estonia. 3/4/0, E20. Latvia. 0/1/0, Arrenurus (Arrenurus) affinis KOENIKE , 1887 La27. Lithuania. 0/2/0, Li6; 2/11/0, Li11; 0/2/0, Previous records. Estonia: Lissenko 1956: 192; Li24. 1962: 158; T. Timm 1965: 96; Ristkok 1994: 120. Lithuania: Čeraška 1932: 25. Family Mideopsidae KOENIKE New records. Latvia. 0/1/0, La10. Mideopsis (Mideopsis) crassipes SOAR , 1904 Remarks. Reported here for the first time for Previous records. Estonia: Lissenko 1956: 192; Latvia. 1958: 188; 1962: 158; Riikoja et al. 1973: 212; Ristkok 1994: 123. Latvia: Ozolin 1930: 269; Arrenurus (Arrenurus) albator (MÜLLER , 1776) Jankowskaja 1959: 218. Previous records. Estonia: Lissenko 1956: 192; New records. Estonia. 0/1/0, E13; 1/1/0, E16; 1962: 159; Ristkok & Ruse 1962: 10; T. Timm 5/0/0, E23; 0/2/0, E29. Latvia. 33/0, La6. 1965: 96; Riikoja et al. 1973: 212; Koplan-Diks Lithuania. 1/1/0, Li1; 0/1/0, Li4; 0/1/0, Li21; & Stravinskaja 1980: 88; Ristkok 1994: 120. 0/1/0, Li22. Latvia: Osolin 1925: 217; 1930: 270. Lithuania: Remarks. Reported here for the first time for Čeraška 1932: 25. Lithuania. New records. Latvia. 0/21/0, La1; 0/2/0, La22; 0/4/0, La33. Lithuania. 2/13/0, Li6; 0/1/0, Li15. Mideopsis (Mideopsis) orbicularis (MÜLLER , 1776) Arrenurus (Arrenurus) batillifer KOENIKE , 1896 Previous records. Estonia: Lissenko 1956: 192; Previous records. Estonia: Lissenko 1956: 192; 1958: 188; 1962: 158; Ristkok & Ruse 1962: 1962: 158; Ristkok & Ruse 1962: 10; Riikoja et 11; T. Timm 1965: 96; V. Timm 1967: 160; al. 1973: 212; Ristkok 1994: 121. Latvia: Osolin Riikoja et al. 1973: 212; Koplan-Diks & 1925: 217; 1930: 270. Lithuania: Čeraška 1932: Stravinskaja 1980: 90; Ristkok 1994: 123; 27. Timm et al. 1996: 152; Timm et al. 1999: 150; New records. Estonia. 0/3/0, E24; 0/3/0, E25; Timm et al. 2001: 98. Latvia: Ozolin 1930: 268; 0/1/0, E28. Latvia. 1/0/0, La8; 1/0/0, La13; Jankowskaja 1959: 218; Koplan-Diks & 0/7/0, La15; 0/4/0, La21; 0/2/0, La23; 1/0/0, Stravinskaja 1980: 94. Lithuania: Čeraška 1932: La26; 0/2/0, La27; 0/3/0, La29. Lithuania. 0/5/0, 23. Li2; 0/1/0, Li12; 0/6/0, Li13; 0/3/0, Li20; 0/2/0, New records. Estonia. 0/2/0, E17. Lithuania. Li24; 0/1/0, Li27; 1/7/0, Li28. 0/1/0, Li5; 1/1/0, Li6; 0/6/0, Li11; 0/4/0, Li29. Remarks. Very likely a number of the old Arrenurus (Arrenurus) bicuspidator BERLESE , records of flowing waters (e.g. V. Timm 1967) 1885 refer to M. roztoczensis . Previous records. Estonia: Lissenko 1956: 192; 1962: 158; Ristkok & Ruse 1962: 10; Riikoja et Mideopsis (Mideopsis) roztoczensis BIESIADKA al. 1973: 212; Timm et al. 1996: 152; Ristkok et KOWALIK , 1979 1994: 121; Timm et al. 1999: 150; Timm et al. New records. Estonia. 2/1/0, E23. Latvia. 5/0, 2001: 98. Latvia: Osolin 1925: 218; 1930: 269; La4; 65/0, La6; 2/0, La8; 0/2/0, La16. Jankowskaja 1959: 218. Lithuania: Čeraška Lithuania. 0/1/0, Li4; 1/4/0, Li21; 0/1/0, Li26. 1932: 26. Remarks. Previously not recorded from the New records. Latvia. 2/7/0, La32. Lithuania. Baltic countries and reported here for the first 0/2/0, Li5; 4/6/0, Li6; 2/0/0, Li11; 0/3/0, Li29; Latvijas Entomologs 2010, 48: 52-75. 67

1/5/0, Li31. 26.

Arrenurus (Arrenurus) bruzelii KOENIKE , 1885 Arrenurus (Arrenurus) cuspidator (MÜLLER , Previous records. Estonia: Lissenko 1956: 192; 1776) 1962: 159; T. Timm 1965: 96; Ristkok 1994: Previous records. Estonia: Lissenko 1956: 192; 121. Latvia: Osolin 1925: 217; 1930: 269. 1962: 158; T. Timm 1965: 96; Ristkok 1994: Lithuania: Čeraška 1932: 24. 121. Latvia: Ozolin 1930: 269; Jankowskaja New records. Estonia. 0/2/0, E17; 0/1/0, E25. 1959: 218. Lithuania: Čeraška 1932: 25. Latvia. 0/3/0, La9; 0/5/0, La11; 0/6/0, La13; New records. Estonia. 0/1/0, E24. Latvia. 0/1/0, 0/2/0, La21; 0/2/0, La23; 1/1/0, La26; 0/1/0, La2; 0/2/0, La11. La32; 0/16/0, La33; 0/13/0, La35. Lithuania. 3/14/0, Li2; 0/1/0, Li20. Arrenurus (Arrenurus) cuspidifer PIERSIG , 1894 Remarks. The colour of all specimens reported Previous records. Estonia: Lissenko 1956: 192; here is red. In Western Europe, the colour is 1962: 158; Ristkok 1994: 121. usually green. New records. Latvia. 0/1/0, La31. Remarks. Reported here for the first time for Arrenurus (Arrenurus) claviger KOENIKE , 1885 Latvia. Previous records. Estonia: Lissenko 1956: 192; 1962: 159; Ristkok 1994: 121. Latvia: Osolin Arrenurus (Arrenurus) fimbriatus KOENIKE , 1925: 218; 1930: 270. Lithuania: Čeraška 1932: 1885 26 (laps. A. clariger ). Previous records. Estonia: Lissenko 1956: 192; New records. Latvia. 0/2/0, La1; 0/1/0, La17; 1962: 159; Ristkok 1994: 121. 1/4/0, La18; 0/11/0, La28; 0/1/0, La31; 0/2/0, New records. Estonia. 0/3/0, E28. Latvia. 0/1/0, La33. Lithuania. 2/7/0, Li24. La25. Remarks. Reported here for the first time for Arrenurus (Arrenurus) compactus PIERSIG , Latvia. 1894 New records. Latvia. 0/1/0, La18. Arrenurus (Arrenurus) kjerrmanni NEUMAN , Remarks. Previously not recorded from the 1880 Baltic countries and reported here for the first Previous records. Estonia: Lissenko 1956: 193; time for Latvia. 1958: 189; 1962: 158; Riikoja et al. 1973: 212; Ristkok 1994: 121. Latvia: Osolin 1925: 217; Arrenurus (Arrenurus) crassicaudatus KRAMER , 1930: 269; Jankowskaja 1959: 219. 1875 Previous records. Estonia: Lissenko 1962: 159; Arrenurus (Arrenurus) latus BARROIS et 1958: 189; Ristkok & Ruse 1962: 10; T. Timm MONIEZ , 1887 1965: 96; V. Timm 1967: 160; Riikoja et al. Previous records. Estonia: Lissenko 1956: 193; 1973: 212; Koplan-Diks & Stravinskaja 1980: 1962: 159; Ristkok 1994: 121. Latvia: 88; Ristkok 1994: 121; Timm et al. 1996: 152; Jankowskaja 1959: 219. Timm et al. 1999: 150; Timm et al. 2001: 98. New records. Latvia. 0/2/0, La31; 0/3/0, La32. Latvia: Osolin 1925: 218; 1930: 270; Lithuania. 0/1/0, Li6. Jankowskaja 1959: 218; Koplan-Diks & Remarks. Reported here for the first time for Stravinskaja 1980: 94. Lithuania: Čeraška 1932: Lithuania. 25. New records. Estonia. 0/3/0, E17. Latvia. 0/1/0, Arrenurus (Arrenurus) maculator (MÜLLER , La28. Lithuania. 0/1/0, Li6; 0/1/0, Li15. 1776) Previous records. Estonia: Lissenko 1956: 193; Arrenurus (Arrenurus) crenatus KOENIKE , 1896 1962: 158; Ristkok 1994: 121. Latvia: Osolin Previous records. Estonia: Lissenko 1956: 192; 1925: 217; 1930: 270; Jankowskaja 1959: 219. 1962: 159; Ristkok 1994: 121. Latvia: Osolin Lithuania: Čeraška 1932: 25. 1925: 217; 1930: 270. Lithuania: Čeraška 1932: New records. Estonia. 1/2/0, E24; 4/10/0, E28. 68 Checklists of Water Mites (Acari: Hydrachnidia and Halacaridae) of the Baltic States

Latvia. 0/11/0, La11; 0/1/0, La13; 0/4/0, La15; 1925: 217; 1930: 270; Jankowskaja 1959: 219. 1/0/0, La22; 0/1/0, La23; 0/1/0, La26; 0/4/0, Lithuania: Čeraška 1932: 26. La27; 0/1/0, La33. Lithuania. 0/1/0, Li6; 0/1/0, New records. Estonia. 0/1/0, E28. Lithuania. Li24; 0/1/0, Li27; 0/2/0, Li28; 0/1/0, Li29. 0/1/0, Li11.

Arrenurus (Arrenurus) neumani PIERSIG , 1895 Arrenurus (Arrenurus) suecicus LUNDBLAD , Previous records. Estonia: Lissenko 1956: 193; 1917 1962: 159; T. Timm 1965: 96; Ristkok 1994: New records. Latvia. 0/1/0, La28. 121. Latvia: Osolin 1925: 217; 1930: 269; Remarks. Previously not recorded from the Jankowskaja 1959: 219. Lithuania: Čeraška Baltic countries and reported here for the first 1932: 26. time for Latvia. New records. Estonia. 1/2/0, E7; 0/12/0, E9; 1/1/0, E10; 2/7/0, E14; 1/7/0, E21; 1/22/0, E28. Arrenurus (Arrenurus) tetracyphus PIERSIG , Latvia. 0/2/0, La17; 0/3/0, La18. Lithuania. 1894 0/1/0, Li11; 6/19/0, Li29. Previous records. Estonia: Lissenko 1956: 193; 1962: 159; Ristkok & Ruse 1962: 10; T. Timm Arrenurus (Arrenurus) nobilis NEUMAN , 1880 1965: 96; Riikoja et al. 1973: 212; Ristkok Previous records. Estonia: Lissenko 1962: 159; 1994: 121. Latvia: Osolin 1925: 217; 1930: 270. 1958: 189; Ristkok & Ruse 1962: 10; Riikoja et Lithuania: Čeraška 1932: 25. al. 1973: 212; Ristkok 1994: 121; Timm et al. 1996: 152; Timm et al. 1999: 150; Timm et al. Arrenurus (Arrenurus) tricuspidator (MÜLLER , 2001: 98. 1776) Syn.: Arrenurus maximus PIERSIG , 1894. Arrenurus (Arrenurus) papillator (MÜLLER , Previous records. Estonia: Nordenskiöld 1913: 1776) 95; Von zur Mühlen & Schneider 1920: 23; Previous records. Estonia: Lissenko 1956: 193; Lissenko 1956: 193; 1958: 189; 1962: 158; 1962: 159; Ristkok 1994: 121 (laps A. Riikoja et al. 1973: 212; Ristkok 1994: 121. papillifer ). Latvia: Osolin 1925: 217; 1930: 270. Latvia: Osolin 1925: 217; Jankowskaja 1959: Lithuania: Čeraška 1932: 24. 220. Lithuania: Čeraška 1932: 27. New records. Estonia. 0/1/0, E17. Latvia. 0/2/0, Arrenurus (Arrenurus) pustulator (MÜLLER , La9; 0/1/0, La13; 0/1/0, La26; 0/2/0, La32; 1776) 0/5/0, La33. Lithuania. 0/6/0, Li6; 0/2/0, Li11. Previous records. Estonia: Lissenko 1956: 193; 1958: 189; 1962: 159; T. Timm 1965: 96; Arrenurus (Arrenurus) virens NEUMAN , 1880 Riikoja et al. 1973: 212; Ristkok 1994: 121. Syn.: Arrenurus crassipetiolatus KOENIKE , 1885 Latvia: Osolin 1925: 218; 1930: 270. Lithuania: Previous records. Estonia: Lissenko 1962: 159; Čeraška 1932: 26. T. Timm 1965: 96. Latvia: Osolin 1925: 218; New records. Latvia. 0/1/0, La1; 0/1/0, La9; 1930: 270. Lithuania: Čeraška 1932: 27. 0/1/0, La13; 0/1/0, La15; 0/1/0, La17; 0/2/0, New records. Estonia. 0/1/0, E25; 4/48/0, E28. La26; 0/3/0, La31. Lithuania. 0/1/0, Li24; 0/1/0, Latvia. 0/1/0, La21; 0/1/0, La28; 0/1/0, La31. Li28; 0/3/0, Li29. Arrenurus (Megaluracarus) buccinator Arrenurus (Arrenurus) radiatus PIERSIG , 1894 (MÜLLER , 1776) Previous records. Estonia. Lissenko 1956: 193; Syn.: Arrenurus caudatus (DEGEER , 1778) Ristkok 1994: 121. Latvia: Ozolin 1930: 269. Previous records. Estonia: Grube 1859: 52; Lithuania: Čeraška 1932: 27. Lissenko 1962: 159. Latvia: Osolin 1925: 215; New records. Estonia. 0/1/0, E4. 1930: 270; Jankowskaja 1959: 218. Lithuania: Čeraška 1932: 28. Arrenurus (Arrenurus) robustus KOENIKE , 1894 New records. Estonia. 0/2/0, E25. Latvia. 0/1/0, Previous records. Estonia: Lissenko 1956: 193; La11; 0/2/0, La27; 1/0/0, La34. Lithuania.1/4/0, 1962: 159; Ristkok 1994: 121. Latvia: Osolin Li2; 1/1/0, Li6; 0/3/0, Li27; 0/1/0, Li32.. Latvijas Entomologs 2010, 48: 52-75. 69

Previous records. Latvia: Jankowskaja 1959: Arrenurus (Megaluracarus) cylindratus 220. PIERSIG , 1896 Previous records. Latvia: Osolin 1925: 216; Arrenurus (Micruracarus) bifidicodulus 1930: 270. Lithuania: Čeraška 1932: 28. PIERSIG , 1897 Previous records. Estonia: Lissenko 1956: 192; Arrenurus (Megaluracarus) globator (MÜLLER , 1962: 159; Ristkok 1994: 121. Latvia: Osolin 1776) 1925: 216; 1930: 270. Lithuania: Čeraška 1932: Previous records. Estonia: Lissenko 1956: 193; 29. 1958: 189; 1962: 159; Ristkok & Ruse 1962: New records. Estonia. 0/3/0, E25; 0/2/0, E26. 10; Riikoja et al. 1973: 212; Ristkok 1994: 121; Latvia. 1/0/0,La11; 0/2/0, La15; 1/2/0, La27; Timm et al. 1996: 152; Timm et al. 1999: 150; 0/3/0, La35. Lithuania. 0/5/0, Li13; 3/8/0, Li17; Timm et al. 2001: 98. Latvia: Osolin 1925: 216; 2/9/0, Li27. 1930: 270. Lithuania: Čeraška 1932: 27. New records. Estonia. 2/11/0, E17; 0/1/0, E25. Arrenurus (Micruracarus) biscissus LEBERT , Latvia. 0/1/0, La15; 0/2/0, La17; 0/11/0, La18; 1879 0/2/0, La21; 1/0/0, La22; 1/11/0, La23. Syn.: Arrenurus fissus VIETS , 1908 Lithuania. 0/18/0, Li2; 3/12/0, Li6; 1/1/0, Li24; Previous records. Estonia: Lissenko 1956: 192; 1/5/0, Li31. 1958: 189; 1962: 159; Ristkok & Ruse 1962: 10; T. Timm 1965: 96; Riikoja et al. 1973: 212; Arrenurus (Megaluracarus) muelleri KOENIKE , Ristkok 1994: 121. Latvia: Osolin 1925: 217; 1901 1930: 270. Lithuania: Čeraška 1932: 25. Previous records. Estonia: Lissenko 1956: 193; Ristkok 1994: 121. Arrenurus (Micruracarus) bisulcicodulus PIERSIG , 1892 Arrenurus (Megaluracarus) securiformis Previous records. Latvia: Osolin 1925: 217; PIERSIG , 1894 1930: 271. Previous records. Estonia: Lissenko 1956: 193; 1958: 189; 1962: 159; Ristkok & Ruse 1962: Arrenurus (Micruracarus) forpicatus NEUMAN , 10; Riikoja et al. 1973: 212; Ristkok 1994: 121. 1880 Latvia: Osolin 1925: 216; 1930: 270. Lithuania: Previous records. Estonia: Lissenko 1956: 193; Čeraška 1932: 27. 1958: 189; 1962: 159; Ristkok & Ruse 1962: 10 (laps. A. forcipatus ); T. Timm 1965: 96 (laps. A. Arrenurus (Megaluracarus) tubulator (MÜLLER , forcipatus ); Riikoja et al. 1973: 212 (laps. A. 1776) forcipatus ); Ristkok 1994: 121 (laps A. Syn.: Arrenurus globator tubulator (MÜLLER , forcipatus ). Latvia: Osolin 1925: 216; 1930: 1776) 271; Jankowskaja 1959: 220. Lithuania: Previous records. Latvia: Jankowskaja 1959: Čeraška 1932: 29. 220. New records. Estonia. 0/1/0, E23; 0/3/0, E28. Arrenurus (Micruracarus) inexploratus Latvia. 1/2/0, La1; 0/1/0, La2; 0/3/0, La13; K.VIETS , 1930 1/21/0, La21; 0/2/0, La22; 0/2/0, La25; 0/7/0, New records. Estonia. 0/1/0, La11; 0/2/0, E18; La26; 0/1/0, La27; 0/4/0, La28; 1/8/0, La32; 0/3/0, E26. Latvia. 0/1/0, La35. Lithuania. 0/2/0, 6/10/0, La33. Lithuania. 0/2/0, Li6; 2/2/0, Li11; Li13; 1/3/0, Li17; 1/0/0, Li18; 0/1/0, Li30. 0/5/0, Li13; 0/3/0, Li15; 3/17/0, Li24; 0/2/0, Remarks. Previously not recorded from the Li29; 0/5/0, Li28. Baltic countries and reported here for the first Remarks. Reported here for the first time for time for Estonia, Latvia and Lithuania. Estonia and Lithuania. Arrenurus (Micruracarus) integrator (MÜLLER , Arrenurus (Megaluracarus) zachariae 1776) KOENIKE , 1886 New records. Estonia. 2/8/0, E20; 0/3/0, E24; 70 Checklists of Water Mites (Acari: Hydrachnidia and Halacaridae) of the Baltic States

0/11/0, E25. Latvia. 1/5/0, La2; 0/1/0, La34; 1776) 0/1/0, La35. Lithuania. 2/3/0, Li13; 0/1/0, Li17. Previous records. Estonia: Lissenko 1962: 159. Remarks. Previously not recorded from the Latvia: Osolin 1925: 216; 1930: 270; Baltic countries and reported here for the first Jankowskaja 1959: 219. Lithuania: Čeraška time for Estonia, Latvia and Lithuania. 1932: 28. New records. Estonia. 2/5/0, E24; 0/2/0, E25. Arrenurus (Micruracarus) perforatus GEORGE , Lithuania. 3/6/0, Li13; 0/1/0, Li23; 1/0/0, Li27; 1881 0/5/0, Li28. Syn.: Arrenurus madei KOENIKE , 1894 Previous records. Latvia: Osolin 1925: 216; Family Halacaridae Murray 1930: 270. Lithuania: Čeraška 1932: 29. Porolohmannella violacea (KRAMER , 1879) New records. Latvia. 0/1/0, La32. New records. Latvia. 0/1/0, La22. Remarks. No halacarid mites have been reported Arrenurus (Micruracarus) pugionifer KOENIKE , from freshwaters of the Baltic countries, and 1908 therefore reported here for the first time for Previous records. Latvia: Osolin 1925: 216; Latvia. 1930: 270. Discussion Arrenurus (Micruracarus) sinuator (MÜLLER , 1776) Species whose have been reported from Previous records. Estonia: Lissenko 1956: 193; the Baltic countries and that nowadays are 1958: 189; 1962: 159; Ristkok & Ruse 1962: considered species incertae , are listed below. 10; T. Timm 1965: 96; Riikoja et al. 1973: 212; Ristkok 1994: 121; Timm et al. 1996: 152; Arrenurus furvator KOCH , 1837 – Grube 1859. Timm et al. 1999: 150; Timm et al. 2001: 98. Eylais emarginata PIERSIG , 1899 – Latvia: Osolin 1925: 216; 1930: 270. Lithuania: Nordenskiöld 1913: 95; Von zur Mühlen & Čeraška 1932: 29. Schneider 1920: 23; Lissenko 1962: 155; New records. Latvia. 0/1/0, La32. Lithuania. Riikoja et al. 1973: 211. 0/2/0, Li6. Hydrachna bivirgulata PIERSIG , 1897 – Čeraška 1932: 10. Arrenurus (Truncaturus) knauthei KOENIKE , Hydrachna denudata PIERSIG , 1896 – Lissenko 1895 1962: 155. New records. Estonia. 0/1/0, E26. Lithuania. Hydrachna inermis PIERSIG , 1895 – Lissenko 0/2/0, Li13. 1956: 187; Ristkok 1994: 122. Remarks. Previously not recorded from the Hydrachna piersigi KOENIKE , 1897 – Baltic countries and reported here for the first Nordenskiöld 1913: 95; Von zur Mühlen & time for Estonia and Lithuania. Schneider 1920: 23; Lissenko 1962: 155; Riikoja et al. 1973: 211. Arrenurus (Truncaturus) nodosus KOENIKE , Hydryphantes bayeri PISA ŘOVIC , 1896 - 1896 Čeraška 1932: 14. Previous records. Latvia: Ozolin 1930: 270. Hydryphantes clypeatus THOR , 1899 – Lissenko Lithuania: Čeraška 1932: 28. 1956: 187; 1962: 155; Ristkok 1994: 122. Lebertia tauinsignata (LEBERT , 1879) – Arrenurus (Truncaturus) stecki KOENIKE , 1894 Nordenskiöld 1913: 95; Von zur Mühlen & Previous records. Estonia: Lissenko 1956: 193; Schneider 1920: 23; Lissenko 1962: 156; 1962: 159; Ristkok 1994: 121. Latvia: Osolin Riikoja et al. 1973: 211. 1925: 216; 1930: 270. Lithuania: Čeraška 1932: Lebertia saxonica THOR , 1911 – Jankowskaja 28. 1959; Lissenko 1956: 188; 1958: 187; 1962: New records. Lithuania. 2/7/0, Li28. 156; Riikoja et al. 1973: 211; Ristkok 1994: 123. Arrenurus (Truncaturus) truncatellus (MÜLLER , Thyas venusta KOCH , 1836 – Grube 1859. Latvijas Entomologs 2010, 48: 52-75. 71

Atractides distans (K.VIETS ), Atractides The data presented here resulted in nodipalpis (THOR ), Atractides (Atractides) documentation of the following new species for ovalis KOENIKE , Atractides cf. pavesii MAGLIO , the fauna: New for Estonia (26 species): Hygrobates calliger PIERSIG , Hygrobates Hydrachna cf. extorris KOENIKE , Hydrachna longiporus THOR , Unionicola gracilipalpis leegei KOENIKE , Hydrodroma torrenticola (K.VIETS ), Unionicola minor (SOAR ), Forelia (WALTER ), Hydryphantes octoporus KOENIKE , brevipes (NEUMAN ), Forelia curvipalpis Hydryphantes placationis THON , Hydryphantes K.VIETS ; Hydrochoreutes krameri PIERSIG , planus THON , Protzia eximia (PROTZ ), Piona ambigua (PIERSIG ), Piona obturbans Hydrodroma torrenticola (WALTER ), Lebertia (PIERSIG ), Piona paucipora (THOR ), Piona pilosa MAGLIO , Oxus nodigerus KOENIKE , rotundoides (THOR ), Piona stjoerdalensis Torrenticola brevirostris (HALBERT ), Limnesia (THOR ), Tiphys bullatus (THOR ), Tiphys undulatoides DAVIDS , Atractides acutirostris pistillifer (KOENIKE ), Axonopsis complanata MOTA et ANGELIER , Atractides digitatus (MÜLLER ), Ljania bipapillata bipapillata THOR , LUNDBLAD , Atractides cf. pavesii MAGLIO , Mideopsis crassipes SOAR , Mideopsis Pionacercus norvegicus THOR , Tiphys ensifer roztoczensis BIESIADKA et KOWALIK , Arrenurus (KOENIKE ), Aturus scaber KRAMER , latus BARROIS et MONIEZ , Arrenurus tubulator Barbaxonella angulata (VIETS ), Ljania (MÜLLER ), Arrenurus inexploratus K.VIETS , bipapillata bipapillata THOR , Ljania macilenta Arrenurus integrator (MÜLLER ), Arrenurus KOENIKE , Mideopsis roztoczensis BIESIADKA et knauthei KOENIKE . KOWALIK , Arrenurus tubulator (MÜLLER ), Total species numbers for Estonia, Latvia Arrenurus inexploratus K.VIETS , Arrenurus and Lithuania are 161, 162 and 137 integrator (MÜLLER ), Arrenurus knauthei respectively. Looking at the species list of each KOENIKE . country, it is clear that many common species New for Latvia (20 species): Eylais relicta have not yet been found. The total species HALBERT , Hydrodroma pilosa BESSELING , numbers will therefore increase considerably Sperchon compactilis KOENIKE , Lebertia when more research is conducted. The total (Lebertia) oblonga KOENIKE , Limnesia koenikei number of water mite species in Europe is PIERSIG , Limnesia polonica SCHECHTEL , estimated to be 1235 (Gerecke & Lehmann Limnesia undulatoides DAVIDS , Hygrobates 2005) and for the Palaearctic region as a whole longiporus THOR , Unionicola minor (SOAR ), 1642 (Di Sabatino et al. 2008). For a number of Piona ambigua (PIERSIG ), Piona obturbans European countries recent data are available: (PIERSIG ), Mideopsis roztoczensis BIESIADKA et The Netherlands, 246 species (Smit et al. 2008), KOWALIK , Arrenurus affinis KOENIKE , Poland, 419 species (Biesiadka 1997) and Arrenurus compactus PIERSIG , Arrenurus Germany, 550 species (Gerecke & Lehmann cuspidifer PIERSIG , Arrenurus fimbriatus 2005). Compared with these numbers an KOENIKE , Arrenurus suecicus LUNDBLAD , increased number of water mite species can be Arrenurus inexploratus K.VIETS , Arrenurus expected for the Baltic countries. integrator (MÜLLER ), Porolohmannella violacea (KRAMER ). Acknowledgements New for Lithuania (42 species): Eylais koenikei HALBERT , Eylais tantilla KOENIKE , We are indebted to Truus van der Pal Todothyas pachystoma (KOENIKE ), Hydrodroma (Alkmaar, The Netherlands) for her assistance pilosa BESSELING , Sperchon clupeifer PIERSIG , in the field work. Gert van Ee (Haarlem, The Sperchon setiger THOR , Sperchonopsis Netherlands) sent us a number of collections verrucosa (PROTZ ), Teutonia cometes (KOCH ), from Latvia, and Tarmo Timm (Rannu, Estonia) Lebertia natans K.VIETS , Oxus carpenteri commented a first draft and helped us find a (HALBERT ), Oxus ovalis (MÜLLER ), Limnesia number of papers. Reinhard Gerecke (Tübingen, koenikei PIERSIG , Limnesia polonica Germany) identified a number of Hydrachna , SCHECHTEL , Limnesia undulatoides DAVIDS , Torrenticola and Atractides species for us. Atractides acutirostris MOTA et ANGELIER , Mārti Ħš Kalni Ħš and Dmitry Telnov (The 72 Checklists of Water Mites (Acari: Hydrachnidia and Halacaridae) of the Baltic States

Entomological Society of Latvia, R īga) helped 138 : 141-378. us during field work in Latvia. Agu Leivits and Gerecke R. 2009. Revisional studies on the Murel Merivee (Nigula, Estonia) offered us European species of the water mite genus accommodation and access to Nigula. Johannes Lebertia NEUMAN , 1880 (Acari: Postma (Ann Arbor, USA) reviewed the Hydrachnidia: Lebertiidae). – English. Abhandlungender Senckenberg Gesellschaftfür References Naturforschung 566 : 1-144. Gerecke R., Lehmann E.O. 2005. Towards a Biesiadka E. 1997. Hydrachnidia. In: Razowski long-term monitoring of Central European J. (ed.), Checklist of Animals of Poland 4: water mite faunas (Acari: Hydrachnidia 229-239. and Halacaridae) - considerations on the Davids K., Di Sabatino A., Gerecke R., Gledhill background of data from 1900 to 2000. – T., Smit H. 2005. On the taxonomy of Limnologica 35 : 45-51. water mites (Acari: Hydrachnidia) Grube A.E. 1859. Verzeichnis der Arachnoiden described from the Palaearctic, part 1: Liv-, Ehst- und Kurlands. – Archiv für die Hydrachnidae, Limnocharidae and Naturkunde Liv-, Kur- und Ehstlands (s. 2) Eylaidae. – Zootaxa 1061 : 36–64. 1: 417-486. Davids C., Di Sabatino A. di, Gerecke R., Jankowskaja A.I. 1959. [Hydracarinen-Fauna Gledhill T., Smit H., Van der Hammen H. der Fischteichen und einiger anderen 2006. 7. Acari: Hydrachnidia. – In: Süsswasserboden der Lettischen SSSR]. – Gerecke, R. (ed.). Chelicerata: Araraneae, Rybnoe khozjajstvo vnutrennikh vodoemov Acari I. – Süßwasserfauna von Latvijskoj SSR 3: 199-224 (in Russian). Mitteleuropa 7/2-1: 241-376. Elsevier Koplan-Diks J.S., Stravinskaja E.A. 1980. – Spektrum Akademischer Verlag, [Anthropogenic impact on small lakes ]. München. Leningrad, Nauka, 173 pp. (in Russian). Di Sabatino A., Smit H., Gerecke R., Lissenko J.M. 1956. [Über die Goldschmidt T., Matsumoto N., Cicolani Wassermilbenfauna des Emajõgi- B. 2008. Global diversity of water mites Beckens]. – Eesti NSV Teaduste (Acari, Hydrachnidia; Arachnida) in Akadeemia juures asuva Loodusuurijate freshwater. – Hydrobiologia 595 : 303-315. Seltsi Aastaraamat 49 : 175-194 (in Di Sabatino A., Gerecke R., Gledhill T., Smit H. Russian). 2009. On the taxonomy of water mites Lissenko I. 1958. [Über die Süsswassermilben- (Acari: Hydrachnidia) described from the fauna des Sees Wõrtsjärw]. – Palaearctic, part 2: Hydryphantoidea and Hüdrobioloogilised Uurimused, Eesti NSV Lebertioidea. – Zootaxa 2266 : 1-34. Teaduste Akadeemia Zooloogia ja Di Sabatino, A., Gerecke R., Gledhill T., Smit Botaanika Instituut 1: 181-190 (in H. 2010. The taxonomic status of the Russian). water mite genera Todothyas Cook and Lissenko I. 1962. [Über die Hydracarinen der Parathyas Lundblad – supplement to Di Estnischen SSR]. – Hüdrobioloogilised Sabatino et al . (2009). Zootaxa 2361 : Uurimused, Eesti NSV Teaduste 68. Akadeemia Zooloogia ja Botaanika Čeraška L. 1932. Die provisorische Liste der Instituut 3: 152-161 (in Russian). Hydracarinen Litauens. – Mém. Fac. Sci. Mühlen von zur M., Schneider G. 1920. Der See Univ. Vytautas le Grand 6, sect. zool.: 1- Wirzjerw in Livland. Biologie und 29. Fischerei. – Archiv für die Naturkunde des Gerecke R. 2003. Water mites of the genus Ostbaltikums 14 : 1-156. Atractides KOCH , 1837 (Acari: Nordenskiöld E. 1913. Hydrachniden aus dem Parasitengona: Hygrobatidae) in the Wirzjerw, gesammelt von Dr. Guido western Palaearctic region: A revision. – Schneider, bestimmt von Dr. E. Zoological Journal of the Linnean Society Nordenskiöld zu Helsingfors. – Latvijas Entomologs 2010, 48: 52-75. 73

Korrespondenzblatt des Naturforscher- zeldzame soorten (Acari: Hydrachnidia). – Vereins zu Riga 56 : 95. Nederlandse Faunistische Mededelingen Osolin V. 1925. Bericht über 28 : 41-47 (in Dutch). hydracarinologische Untersuchungen in Timm T. 1965. [Über die Bodentierwelt der Lettland. I. Mitteilung. – Zoologischer kleinen Seen Südost-Estlands]. – Anzeiger 62 : 215-223. Loodusuurijate Seltsi Aastaraamat 57 : 83- Ozolin V. 1930. Bericht über 102 (in Estonian). hydracarinologische Untersuchungen in Timm V. 1967. [Notes on the benthos in the Lettland. II. Mitteilung. – Folia zoological Narva River]. – Loodusuurijate Seltsi et hydrobiologica 1 (2): 257-278. Aastaraamat 58 : 154-163 (in Estonian). Riikoja H., Ristkok J., Ruse K., Timm T., Timm Timm T., Kangur K., Timm H., Timm V. 1996. V., Tõlp Õ. 1973. Põhjaloomastik . In: Macrozoobenthos of Lake Peipsi-Pihkva: Timm T. (ed.). Võrtsjärv: 114-143. taxonomical composition, abundance, Valgus, Tallinn. biomass, and their relations to some Ristkok J., Ruse K. 1962. [Über den Bestand ecological parameters. – Hydrobiologia und die Verbreitung der Bodenfauna im 338 : 139-154. Litoral des Sees Wõrtsjärw]. – Tartu Timm T., Kangur K., Timm H., Timm V. 1999. Riikliku Ülikooli 120 , Zooloogia-Alaseid Zoobentos. In: Pihu E., Raukas A. (eds.). II : 3-52 (in Estonian). Peipsi : 137-153. Keskkonnaministeeriumi Ristkok J. 1994. [Hydrobionten in Info - Ja Tehnokeskus, Tallinn. Fliessgewässern des Systems vom Fluss Timm T., Kangur K., Timm H., Timm V. 2001. Emajõgi]. – Eesti Looduseuurijate Seltsi Zoobenthos. In: Pihu E., Haberman J. Aastaraamat 75 : 97-147 (In Estonian). (eds.). Lake Peipsi. Flora and Fauna . Smit H., Hop H., Munts R. 2008. Twee soorten Sulemees Publishers, Tartu: 82-98. watermijten nieuw voor de Nederlandse fauna, alsmede nieuwe vondsten van Received: November 13, 2009.

Annex 1. List of locations. Abbreviations: E – Estonia, La – Latvia, Li – Lithuania.

Location Description Coordinates Date leg. code N, E E1 Klooster jõgi at Padise monastery (Harnumaa 59º13.607, 24º08.437 20.04.2008 leg. D. Tempelman county) & T. van Haaren E2 brooklet through sedge marsh, Jaagarahu, 5 km 58º24.036, 21º59.447 21.04.2008 leg. D. Tempelman NW of Kihelkonna, just N of Vilsandi NP, & T. van Haaren Saaremaa E3 Saaremaa, forest pool along Karujärv 58º23.293, 22º13.097 21.04.2008 leg. D. Tempelman & T. van Haaren E4 Saaremaa, temporary pool near cape Undva nina 58º30.767, 21º55.103 21.04.2008 leg. D. Tempelman & T. van Haaren E5 Saaremaa, freshwater pool near seashore at 58º10.677, 22º06.198 22.04.2008 leg. D. Tempelman Toomalõuka, ca 20 km WSW of Kuressaare & T. van Haaren E6 stream with Berula erecta , 14 km south of 58º15.337, 22º01.839 22.04.2008 leg. D. Tempelman Kihelkonna, Saaremaa & T. van Haaren E7 Nigula jãrv 58º00.461, 24º42.707 23.04.2008 leg. D. Tempelman & T. van Haaren E8 Paadrema stream, 15 km SSW of Lihula, Pärnu 58º31.879, 23º41.865 23.04.2008 leg. D. Tempelman County & T. van Haaren E9 small bog pool 750m N of watching tower, 58º00.972, 24º42.352 23.04.2008 leg. D. Tempelman Nigula & T. van Haaren E10 bog pool in Rongu raba, Sookuninga raba 57º59.568, 24º53.040 24.04.2008 leg. D. Tempelman & T. van Haaren E11 marsh pool in forest with Calla , Nigula, southern 58º00.854, 24º40.649 24.04.2008 leg. D. Tempelman part of Neljas Peaksi & T. van Haaren E12 temporary pond, Puise, Matsalu NP 58°46.490, 3°27.624 14.05.2009 leg. H.Smit 74 Checklists of Water Mites (Acari: Hydrachnidia and Halacaridae) of the Baltic States

Annex 1. Continued. E13 Loobu River at Porgaste, Lahemaa NP 59°32.424, 5°47.797 16.05.2009 leg. H. Smit E14 moorland pool in Viru Bog, Lahemaa NP 59°28.123, 5°39.211 16.05.2009 leg. H. Smit E15 Valgejõgi River at Nõmmeveski, Lahemaa NP 59°30.484, 5°47.364 16.05.2009 leg. H. Smit E16 Altja stream, Lahemaa NP 59°34.267, 6°06.744 17.05.2009 leg. H. Smit E17 Lake Käsmu 59°35.173, 5°53.093 17.05.2009 leg. H. Smit E18 marsh W of Vergi, Lahemaa NP 59°36.290, 6°03.461 17.05.2009 leg. H. Smit E19 marshy area bordering Baltic Sea, W of Võsu 59°34.683, 5°55.976 17.05.2009 leg. H. Smit E20 Lake Endla, Lake Endla NR 58°51.659, 6°12.315 18.05.2009 leg. H. Smit E21 moorland pool in Männikjärve raba, Endla NR 58°52.553, 6°14.847 18.05.2009 leg. H. Smit E22 marshy pool along road to Palupõhja, Alam- 58°25.952, 6°18.861 19.05.2009 leg. H. Smit Pedja NR E23 Pedja River, Alam-Pedja NR 58°32.626, 6°14.197 20.05.2009 leg. H. Smit E24 small lake N of Kärevere bridge, along road 2 58°25.329, 6°30.048 20.05.2009 leg. H. Smit E25 ditch along road to Palupõhja, Alam-Pedja NR 58°25.889, 6°14.802 21.05.2009 leg. H. Smit E26 ditch along sideroad, Palupõhja, Alam-Pedja NR 58°25.876, 6°19.833 21.05.2009 leg. H. Smit E27 flooded meadow, Aardla 58°19.505, 6°45.352 21.05.2009 leg. H. Smit E28 former fishpond near Ilmatsalu 58°24.490, 6°33.388 21.05.2009 leg. H. Smit E29 Ahja River downstream of dam, Taevaskoja 58°06.478, 7°03.028 22.05.2009 leg. H. Smit La1 Riga district, Gaujas NP, Sigulda, Lindes atteka 57°08.923, 4°49.920 10.06.2005 leg. G. van Ee (oxbow) La2 Riga district, Gaujas NP, Sigulda, beaver ponds 57°09.058, 4°49.073 10.06.2005 leg. G. van Ee and oxbows at Maza velnala (cave/sandstone cliffs) La3 Cesis district, Oxbow at Titmanu, W of Ligatne, 57º14.629, 24º58.680 11.06.2005 leg. G. van Ee Gauja NP La4 Gauja River, riverbank, Gauja NP, Sigulda 57°09.933, 4°50.415 13.06.2005 leg. G. van Ee La5 Rauza River, Kalnini, Valkas District 57°22.328, 6°00.058 14.06.2005 leg. G. van Ee La6 Pededze River, Pertupe, Gulbenes district 57°00.318, 6°52.533 14.06.2005 leg. G. van Ee La7 Ramata brook 57º56.848, 25º00.404 25.04.2008 leg. D. Tempelman & T. van Haaren La8 Gauja river between Valmiera and Stren či near 57º36.880, 25º37.842 26.04.2008 leg. D. Tempelman Puri Ħi. Zieme Ĝgauja protected nature territory & T. van Haaren La9 Oxbow lake Karusene, east of Stren či, 57º37.269, 25º42.101 26.04.2008 leg. D. Tempelman Zieme Ĝgauja protected nature territory & T. van Haaren La10 Valka district, Pukšu purvs (bog) near Gail īši, 57º39.640, 25º56.133 26.04.2008 leg. D. Tempelman Zieme Ĝgauja protected nature territory & T. van Haaren La11 Valka district, Oxbow lake Gauja south of 57º36.999, 25º41.417 26.04.2008 leg. D. Tempelman Stren či, East of Udri Ħas, Zieme Ĝgauja protected & T. van Haaren nature territory La12 Amata river near A2 highway 57º13.310, 25º14.941 27.04.2008 leg. D. Tempelman & T. van Haaren La13 eutrofic pond at Nurmiži 57º11.980, 24º56.909 27.04.2008 leg. D. Tempelman & T. van Haaren La14 Gauja river at Ėūė u iezis, Gauja NP 57º16.448, 25º06.325 27.04.2008 leg. D. Tempelman & T. van Haaren La15 Oxbow lake at T ītma Ħu, W of L īgatne, Gauja NP 57º14.629, 24º58.680 27.04.2008 leg. D. Tempelman & T. van Haaren La16 Pearl Mussel Brook (P ērĜupe) near Ieri ėi, 57º13.269, 25º11.090 27.04.2008 leg. D. Tempelman Melturu Sils protected nature territory, C ēsis & T. van Haaren District La17 moorland pool in Teirumnieki 56°43.118, 6°56.883 11.05.2009 leg. H. Smit La18 Lake Islienas, Tei či Bog 56°39.245, 6°22.745 12.05.2009 leg. H. Smit La19 Lake Siksalas, Tei či Bog 56°09.040, 6°25.093 12.05.2009 leg. H. Smit La20 southern shore Lake Lub āns 56°43.416, 6°49.966 12.05.2009 leg. H. Smit La21 Aiviekste River between M ētriena and Madona 56°44.626, 6°20.157 13.05.2009 leg. H. Smit La22 lake, Sedas Bog 57°40.213, 5°45.086 22.05.2009 leg. H. Smit La23 Sedas Bog, canal north side 57°42.562, 5°43.005 22.05.2009 leg. H. Smit La24 Amata River, Gauja NP 57°15.671, 5°08.338 23.05.2009 leg. H. Smit Latvijas Entomologs 2010, 48: 52-75. 75

Annex 1. Continued. La25 beaver-pool east of Peldu Road, Sigulda 57°09.454, 4°50.303 23.05.2009 leg. H. Smit La26 Lake Āraišu, S of C ēsis 57°15.156, 5°16.688 23.05.2009 leg. H. Smit La27 marshy pool with Carex , W of T ītma Ħi, Gauja 57°14.607, 4°58.873 23.05.2009 leg. H. Smit NP La28 Lake Akmenradzi Ħa, Kemeri NP 56°59.262, 3°28.202 25.05.2009 leg. H. Smit La29 Lake Slokas, Kemeri NP 56°57.454, 3°32.807 25.05.2009 leg. H. Smit La30 car along road to Mazirbe, Sl īteres NP 57°38.646, 2°22.135 26.05.2009 leg. H. Smit La31 ditch E-side Lake Engure 57°16.300, 3°07.754 26.05.2009 leg. H. Smit La32 Lake Engure, N-side 57°19.052, 3°05.416 26.05.2009 leg. H. Smit La33 old gravel pit, V īdale 57°36.695, 2°26.457 26.05.2009 leg. H. Smit La34 beaver-swamp along road Mazirbe-Ventspils 57°40.333, 2°18.890 27.05.2009 leg. H. Smit La35 Equisetum-Carex swamp, along road Mazirbe- 57°36.720, 2°06.294 27.05.2009 leg. H. Smit Ventspils Li1 Gr ūda stream, Dz ūkijos NP 54°01.353, 4°20.005 2.05.2009 leg. H. Smit Li2 Lake Ūla, between Lynežeris and Rudnia 54°03.946, 4°38.231 2.05.2009 leg. H. Smit Li3 stream Uosupis at Pauosupe, Dz ūkijos NP 54°05.715, 4°35.403 2.05.2009 leg. H. Smit Li4 Ūla River at crossing with road 54°07.775, 4°27.713 2.05.2009 leg. H. Smit Li5 Lake Gr ūdos, Kabeliai 53°55.949, 4°17.925 3.05.2009 leg. H. Smit Li6 Lake at Kabeliai, SE of Druskininkai 53°57.022, 4°17.322 3.05.2009 leg. H. Smit Li7 forest pool near Dubas, SE of Druskininkai 53°58.697, 4°13.383 3.05.2009 leg. H. Smit Li8 Yznin ÷ stream 53°58.674, 4°06.661 3.05.2009 leg. H. Smit Li9 Lake Latežeris 53°58.792, 4°06.456 3.05.2009 leg. H. Smit Li10 stream Ratny čia, between Druskininkai and 53°59.537, 4°03.631 3.05.2009 leg. H. Smit Latežeris Li11 Lake Kastinis 54°03.599, 4°25.551 3.05.2009 leg. H. Smit Li12 small Sphagnum -bog bordering Lake Kastinis 54°03.588, 4°25.698 3.05.2009 leg. H. Smit Li13 Equisetum-pool, Mateliai 54°15.156, 3°47.516 4.05.2009 leg. H. Smit Li14 carr W of Lake Obelija, Meteliai 54°17.810, 3°48.925 4.05.2009 leg. H. Smit Li15 Lake Obelija, west-side 54°17.865, 3°48.967 4.05.2009 leg. H. Smit Li16 stream Bambena at Ąžuoliniai 54°25.741, 3°36.052 5.05.2009 leg. H. Smit Li17 forest pool in Buktos Forest 54°26.028, 3°25.227 5.05.2009 leg. H. Smit Li18 reed bed Lake Žuvintas 54°27.419, 3°38.180 5.05.2009 leg. H. Smit Li19 Lake Žuvintas 54°27.540, 3°38.426 5.05.2009 leg. H. Smit Li20 Lemna-pool, near Šal čia River 54°20.427, 4°57.203 6.05.2009 leg. H. Smit Li21 Šal čia River 54°20.427, 4°57.203 6.05.2009 leg. H. Smit Li22 stream Lakaja at Lakaja 55°10.930, 5°41.652 8.05.2009 leg. H. Smit Li23 forest pool between Labanoras and Pr ūdišk ÷, 55°13.948, 5°48.913 8.05.2009 leg. H. Smit Labanoras Regional Park Li24 Lake Labanoras, Labanoras Regional Park 55°15.962, 5°47.425 8.05.2009 leg. H. Smit Li25 carr near Murmos, S of Ignalina 55°13.526, 6°03.552 9.05.2009 leg. H. Smit Li26 Žeimena River at crossing with road 111 55°15.165, 5°59.466 9.05.2009 leg. H. Smit Li27 beaver-swamp, Aukštaitijos NP 55°24.274, 6°06.006 9.05.2009 leg. H. Smit Li28 pond at Garb ūnal, S of Ignalina 55°18.465, 6°08.624 10.05.2009 leg. H. Smit Li29 moorland pool near Šilinis, Aukštaitijos NP 55°23.793, 5°59.356 10.05.2009 leg. H. Smit Li30 carr between Nida and Russian border, Curonian 55°17.322, 0°58.297 28.05.2009 leg. H. Smit Spit Li31 ditch with Stratiotes , Rusn ē Island 55°19.751, 1°18.729 29.05.2009 leg. H. Smit Li32 ditch in Aukštumales Bog, NW of Šilut ÷ 55°23.638, 1°21.702 29.05.2009 leg. H. Smit