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Freshwater Halacarid Mites (Acari: Halacaridae) from Madagascar

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Freshwater Halacarid Mites (Acari: Halacaridae) from Madagascar Freshwater halacarid mites (Acari: Halacaridae) from Madagascar. New records and the description of a new species I. Bartsch To cite this version: I. Bartsch. Freshwater halacarid mites (Acari: Halacaridae) from Madagascar. New records and the description of a new species. Acarologia, Acarologia, 2013, 53 (1), pp.77-87. 10.1051/acarolo- gia/20132080. hal-01565799 HAL Id: hal-01565799 https://hal.archives-ouvertes.fr/hal-01565799 Submitted on 20 Jul 2017 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. Distributed under a Creative Commons Attribution - NonCommercial - NoDerivatives| 4.0 International License ACAROLOGIA A quarterly journal of acarology, since 1959 Publishing on all aspects of the Acari All information: http://www1.montpellier.inra.fr/CBGP/acarologia/ [email protected] Acarologia is proudly non-profit, with no page charges and free open access Please help us maintain this system by encouraging your institutes to subscribe to the print version of the journal and by sending us your high quality research on the Acari. Subscriptions: Year 2017 (Volume 57): 380 € http://www1.montpellier.inra.fr/CBGP/acarologia/subscribe.php Previous volumes (2010-2015): 250 € / year (4 issues) Acarologia, CBGP, CS 30016, 34988 MONTFERRIER-sur-LEZ Cedex, France The digitalization of Acarologia papers prior to 2000 was supported by Agropolis Fondation under the reference ID 1500-024 through the « Investissements d’avenir » programme (Labex Agro: ANR-10-LABX-0001-01) Acarologia is under free license and distributed under the terms of the Creative Commons-BY-NC-ND which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original author and source are credited. Acarologia 53(1): 77–87 (2013) DOI: 10.1051/acarologia/20132080 FRESHWATER HALACARID MITES (ACARI: HALACARIDAE) FROM MADAGASCAR. NEW RECORDS AND THE DESCRIPTION OF A NEW SPECIES Ilse BARTSCH (Received 12 June 2012; accepted 24 August 2012; published online 29 March 2013) Forschungsinstitut Senckenberg, c/o DESY, Notkestr. 85, 22607 Hamburg, Germany. [email protected] ABSTRACT — In recent years the numbers of aquatic mite species from Madagascar has increased considerably (Gerecke 2004a, b, 2006, 2009; Goldschmidt 2008; Tuzovski and Gerecke 2009), but the area is still a white spot with respect to knowledge of its freshwater halacarid (Halacaridae) fauna. Recently, some halacarid specimens were extracted from sandy deposits of the banks of streams and creeks. These samples included four species, namely Limnohalacarus cultellatus Viets, 1940, Limnohalacarus novus Bartsch, 2013, Lobohalacarus weberi (Romijn and Viets, 1924), and a new species of the genus Ropohalacarus. The new species, Ropohalacarus pallidus n. sp., is described, and the characters of the other species are outlined. The three genera collected in Madagascar are cosmopolitan and the Lobohalacarus and Limnohalacarus species are wide-spread. The halacarid fauna of Madagascar seems to be poor in endemic species, which is contrary to the situation for the freshwater Hydrachnidia mites. Future studies will certainly increase the number of halacarid species but not the percentage of endemics. KEYWORDS — Halacaroidea; Madagascar; running water; description; Limnohalacarus; Lobohalacarus; Ropohalacarus; bio- geography INTRODUCTION At present eight halacarid species are known from continental Africa, i.e. Limnohalacarus africanus Madagascar with its diverse aquatic mite fauna Walter, 1935 (Sahara, Burkino Faso, Cameroon, (Gerecke 2004b; Goldschmidt 2008) is a terra incog- South Sudan), L. fontinalis Walter and Bader, 1952 nita as to the knowledge of its freshwater hal- (Kenya, South Sudan), L. major Bader, 1968 (DR acarids. From the African continent, most records Congo, Lake Tanganyika), L. portmanni Bader, 1967 and descriptions of halacarids are from the 1950th (DR Congo, Lake Tanganyika), Lobohalacarus weberi to 1970th (Walter and Bader 1952; Bader 1967, 1968; (Romijn and Viets, 1924) (Kenya, Tunisia), Poroha- Green et al. 1974). Reasons for absence of halacarid lacarus alpinus (Thor, 1910) (Algeria), Ropohalacarus records from Madagascar may be the size of the uniscutatus (Bartsch, 1982) (Tunisia), and Soldanel- mites, their colour and life-style. Most of the adults lonyx monardi Walter, 1919 (Kenya, Tunisia) (Wal- have an idiosomal length of distinctly less than 600 ter 1935; Walter and Bader 1952; Bader 1967, 1968; µm, often the species are pale and lack conspicuous Green 1984; Green et al. 1974; Bartsch 2008a, 2013). pigment spots, and halacarids are benthic, crawling rather slowly amongst a substratum. http://www1.montpellier.inra.fr/CBGP/acarologia/ 77 ISSN 0044-586-X (print). ISSN 2107-7207 (electronic) Bartsch I. MATERIALS AND METHODS with 3-10 pairs of perigenital setae, males with 17- 30 pairs of setae. Female genital opening near pos- The halacarid mites were extracted from the banks terior margin of genital plate and covered by large of small streams and creeks by digging pits into genital sclerites. Male genital opening smaller, re- the sandy deposits and filtering the seeped wa- moved from posterior margin of genitoanal plate. ter (Karaman-Chappuis Method). Collectors are Anal sclerites much smaller than genital sclerites. Drs R. Gerecke and T. Goldschmidt. The mites Base of gnathosoma wide, rostrum conical. Palps were cleared in lactic acid, rinsed in glycerine and four-segmented, attached dorsally. Second palpal mounted in glycerine jelly. The holotype, paratypes segment with short basal and long distal seta, third and voucher specimens are deposited in the Zoo- segment with large ventral spine, fourth segment logical Museum, Hamburg (ZMH), additional ma- with six setae and apical spine. Leg segments slen- terial in the author’s collection. der, in general bearing conspicuously long setae. Rarely occurring numbers of setae or acetabula Genua I and II shorter than these legs’ telofemora. are in parentheses. The legs are numbered I to IV, Tibia III with four ventral setae, mostly two of them the segments are trochanter, basifemur, telofemur, bipectinate. Tarsi I to IV with 1, 0, 0, 0 ventral setae genu, tibia, and tarsus. The number of setae on and 4, 4, 4, 3 dorsal setae. Tarsi I to III with solenidia the tarsi includes the solenidion but excludes the in dorsolateral position. Paired claws of tarsi with parambulacral setae. In the illustrations marginal pectines. Arrangement and size of tines on claw I setae are shown either in the dorsal or in the ventral different from those of following tarsi. aspect but not in both. Drawings were done with a Comments — The genus in spread on all con- drawing tube. tinents except Antarctica. Records are from fresh water as well as from coastal and inland saline wa- ters. Limnohalacarus includes at present 13 species RESULTS (Bartsch 2009, 2013). Four species were extracted from sandy deposits Limnohalacarus cultellatus Viets, 1940 of banks of rivers, Limnohalacarus cultellatus Viets, 1940, Limnohalacarus novus Bartsch, 2013, Lobohal- Collecting data — One female (slide), ZMH, north- acarus weberi, and a new Ropohalacarus species, R. ern Madagascar, Antisiranana, Antalaha, Marofi- pallidus n. sp. naritra, River Andranomenaheli, upstream conflu- ence with River Ankavia (right affluent below MD 135), 70 m, 22.3°C, 0.009 mS/cm, riffle; 04 Nov. GENUS Limnohalacarus WALTER, 1917 2001; coll. R. Gerecke and T. Goldschmidt. Diagnosis (female, Madagascar individual) — Type species — Halacarus wackeri Walter, 1914. Idiosoma pale, its length 274 µm. Dorsal plates Diagnosis (adults) — Plates delicately and with reticulate ornamentation. Anteriormost part evenly punctate. Dorsum with anterior and poste- of anterior dorsal plate smooth and separated from rior dorsal plate and pair of ocular plates, five pairs reticulate major part; anterior dorsal plate rectan- of gland pores and three to four pairs of very short gular, 1.1 times longer than wide. Ocular plates dorsal setae. Ocular plate and sclerite with third sub-circular, 1.1 times longer than wide. Sclerite gland pore often fused. Venter with anterior and with gland pore triangular, not fused with ocular pair of posterior epimeral plates and genital plate. plate. Posterior dorsal plate elongate, 1.7 times Either plates separated or all fused to a shield. An- longer than wide and 2.4 times longer than anterior terior epimeral plate with three pairs of setae, pos- dorsal plate. With four pairs of dorsal setae, second terior plates with a dorsal, lateral and ventral seta. pair of setae in striated integument between ante- Acetabula arranged along lateral margins of genital rior dorsal plate and ocular plates; adanal setae on plate (or part corresponding to this plate). Females anal cone, in ventrolateral position. Ventral plates 78 Acarologia 53(1): 77–87 (2013) (anterior, pair of posterior epimeral plates and gen- soma 1.2 times longer than wide; rostrum short. ital plate) separated. Genital plate with four to five Dorsal pair of maxillary setae wider than basal pair. pairs of acetabula,
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