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Acari: Hydrachnidia: Hygrobatidae) Ecologica Montenegrina 44: 1-10 (2021) This journal is available online at: www.biotaxa.org/em http://dx.doi.org/10.37828/em.2021.44.1 https://zoobank.org/urn:lsid:zoobank.org:pub:145A84E6-3C8C-4D80-9D9E-B77CAF2A3227 New records of the water mite genus Atractides Koch, 1837 from Iran (Acari: Hydrachnidia: Hygrobatidae) VLADIMIR PEŠIĆ1*, HARRY SMIT2 & ALIREZA SABOORI3 1 Department of Biology, University of Montenegro, Cetinjski put b.b., 81000 Podgorica, Montenegro. 2 Naturalis Biodiversity Center, P.O. Box 9517, 2300 RA Leiden, the Netherlands. 3 Department of Plant Protection, Faculty of Agriculture, University of Tehran, Karaj, Iran. *Corresponding author. E-mail: [email protected] Received 1 July 2021 │ Accepted by V. Pešić: 7 July 2021 │ Published online 8 July 2021. Abstract In the present study three water mite species of the genus Atractides Koch, 1837 are reported from Iran. Atractides yazdensis sp. nov., is decribed as new for science; the hitherto unknown females of A. elburzensis Pešić, Smit & Saboori, 2014 and A. bakhtiari Pešić, Asadi & Saboori, 2016 are described. Key words: Acari, new species, taxonomy, running waters, Iran. Introduction The water mite genus Atractides Koch, 1837 has been found in all biogeographical regions except Antarctica and Australasia (Gerecke 2003). The name Atractides was firstly proposed in 1837 by the German arachnologist Carl Ludwig Koch, with A. spinipes Koch, 1837 as typus generis (Radford 1950). In the Palaearctic, the genus comprises of three subgenera, i.e., Atractides s. s., Tympanomegapus Thor, 1923, and Polymegapus K. Viets, 1926. More than 180 years of taxonomic studies has led to the identification of 172 species from the Palaearctic region (Pešić and Smit 2021a, b). In Iran, the genus Atractides includes 30 species (Schwoerbel and Sepasgozarian1976, Pešić and Asadi 2002, Pešić and Saboori 2007, Pešić and Vafaei 2009, Asadi et al. 2010, Pešić et al. 2004a,b, 2005a,b, 2006, 2007, 2008, 2009, 2011, 2012, 2014, 2016, 2019). Most of these species belong to Atractides s.s., while two species belong to Polymegapus K. Viets, 1926 (i.e., A. cf. polyporus (K. Viets, 1922) and A. persicus Pešić & Asadi, 2010) and two species belong to Tympanomegapus Thor, 1923 (i.e., A. acutirostris (Motaş & C. Angelier, 1927) and A. omanensis Smit & Pešić, 2010). In this paper, one new species of the genus Atractides is described from Iran. Moreover, the hitherto unknown females of two species (A. elburzensis and A. bakhtiari) are described. Ecologica Montenegrina, 44, 2021, 1-10 NEW RECORDS OF WATER MITE GENUS ATRACTIDES FROM IRAN Material and Methods Water mites were collected by hand netting, sorted live in the field, and immediately preserved in Koenike’s fluid and/or 96% ethanol. Some specimens were dissected, and slide mounted in Faure’s medium. Morphological nomenclature follows Gerecke et al. (2016). The holotype and paratype of the new species are deposited in Naturalis Biodiversity Center in Leiden (RMNH). In the section ‘Material examined’ collecting site abbreviations derive from the geographical database Pešić. All measurements are in µm. The following abbreviations are used: Ac-1 = first acetabulum; asl = above sea level; Cx-I = first coxae; dL = dorsal length; Dgl-3 = dorsoglandularia 3; H = height; I-L-4-6 = fourth-sixth segments of first leg; L = length; lL = lateral length; mL = medial length; P-1-P-5 = palp segment 1-5; pregen = pregenital sclerite; RMNH = Naturalis Biodiversity Center, Leiden; S-1 = seta 1 on I- leg-5; Vgl-1 = ventroglandularia 1; W = width. Systematics Family Hygrobatidae Koch Genus Atractides Koch, 1837 Subgenus Atractides s.s. Atractides (Atractides) elburzensis Pešić, Smit & Saboori, 2014 Fig. 1 Material examined — Iran, IR81 Mazandaran Province, Tilikenar (ca. 25 km from Chalus), Warabon, stream in forest, 17.06.2005, leg. Pešić & Saboori, 1 ♂, 14 ♀ (1 ♂, 1 ♀, dissected and slide mounted - RMNH). Description. Female — Integument striated, muscle insertions unsclerotized. Glandularia enlarged (Dgl-3 38 µm); secondary sclerotization generally less extended than in males (see Pešić et al. 2014), but clearly visible in the irregular margins of the glandularia, coxae and genital sclerites. Mediocaudal margin Cx-I convex, apodemes of Cx-II in an obtuse angle. Acetabula in an obtuse triangle, pregen large (Fig. 1A). Excretory pore smooth; Vgl-1 not fused to Vgl-2 (but in older specimens apparently fused). Palps: more slender than in males (see Pešić et al. 2014), ventral margin P-2 straight, with slightly curved distal margin, ventral margin P-3 straight or slightly concave, P-4 with a small denticle near ventral setae, P-4 sword seta halfway between ventral setae (Fig. 1B). Legs: I-L-5 with dorsal and ventral margins subparallel basally and centrally, but slightly diverging near the distal edge, S-1 and -2 slender and close to each other; I-L-6 relatively long and weakly curved, narrowed in the centre of the segment (Fig. 1C). Measurements. Female — Idiosoma L 675, W 531; maximum diameter Dgl-3, 38. Coxal shield L 316; Cx-III W 386; Cx-I+II mL 106, Cx-I+II lL 216. Genital field L/W 141/147, genital plates L 92-99, pregenital sclerite W 100, gonopore L 106, L Ac-1-3: 29, 30, 33. Eggs (n = 2) maximum diameter 141-144. Gnathosoma — palp total L 332; dL/H, dL/H ratio: P-1, 26/25, 1.03; P-2, 66/41, 1.6; P-3, 89/37, 2.4 1.9; P-4, 118/27, 4.2; P-5, 33/11, 3.0; length ratio P-2/P-4, 0.59. Gnathosoma vL 115. Legs — I-L-5 dL 157, vL 130, dL/vL ratio 1.21, maximum H 31, dL/maximum H 5.1, S-1 L 48, L/W ratio 7.7, S-2 L 48, L/W ratio 6.8, distance S-1-2, 4.0, dL ratio S-1/2 1.0; I-L-6 dL 119, central H 23, dL/central H ratio 5.17; L I-L-5/6 ratio 1.32. Remarks — The species was described by Pešić et al. (2014) on the basis of a single male collected in a mountain stream in Kheirud Kenar forest in Mazandaran Province. Therefore, this is the first description of the female. Distribution — Iran (Pešić et al. 2014; this study). 2 PEŠIĆ ET AL. Figure 1. Atractides elburzensis Pešić, Smit & Saboori, 2014, ♀, Tilikenar, Iran. A – idiosoma, ventral view; B – palp, lateral view; C – I-L-5 and -6. Scale bars = 100 µm. Ecologica Montenegrina, 44, 2021, 1-10 3 NEW RECORDS OF WATER MITE GENUS ATRACTIDES FROM IRAN Atractides (Atractides) bakhtiari Pešić, Asadi & Saboori, 2016 Figs. 2-3 Material examined — Iran, IR75 North Khorasan Province, Darrood stream in Darrood city (ca. 59º08´E, 36º10´N), ca. 2200 m asl., 10.06.2005. leg. Pešić & Saboori, 2 ♂, 4 ♀ (1 ♂, 1 ♀, dissected and slide mounted - RMNH). Description. Female — Integument lineated, muscle insertions unsclerotized. Glandularia diameter 23 µm. Mediocaudal margin Cx-I indented, apodemes of Cx-II strong, in an acute angle with the median line (Fig. 3A). Acetabula in a weakly curved line (Fig. 3C). Excretory pore smooth; Vgl-1 not fused to Vgl-2. Palp: P- 2 with a slightly convex ventrodistal margin; P-3 ventral margin concave; P-4 slender than in male, ventral margin slightly protruding near proximoventral seta, sword seta between ventral setae (Fig. 3B). I-L-5: S-1-2 separated, with obtuse tips, S-1 slender, S-2 shorter and proximally enlarged; I-L-6 maximum H in basal part, distally equally narrowed (Fig. 3D). Measurements. Male — Idiosoma L 525 W 413; maximum diameter Dgl-3, 23. Coxal shield L 322 ; Cx-III W 353; Cx-I+II mL 91, Cx-I+II lL 197. Genital field L/W 98/102 ratio 0.97, L Ac-1-3: 31-34, 34-36, 24-25. Ejaculatory complex L 125. Figure 2. Atractides bakhtairi Pešić, Asadi & Saboori, 2016, ♂, Darrood, Iran. A – genital field; B – palp, medial view; C – I-L-5 and -6. Scale bar = 100 µm. 4 PEŠIĆ ET AL. Figure 3. Atractides bakhtiari Pešić, Asadi & Saboori, 2016, ♀, Darrood, Iran. A – coxal field, partial view; B – palp, medial view; C – genital field; D – I-L-5 and -6. Scale bars = 100 µm. Ecologica Montenegrina, 44, 2021, 1-10 5 NEW RECORDS OF WATER MITE GENUS ATRACTIDES FROM IRAN Gnathosoma — palp total L 275; dL/H, dL/H ratio: P-1, 31/25, 1.25; P-2, 64/53, 1.21; P-3, 59/42, 1.41; P-4, 88/38, 2.3; P-5, 33/14, 2.3; length ratio P-2/P-4 0.73. Chelicera total L 192. Legs — I-L-5 dL 170, vL 109, dL/vL ratio 1.56, maximum H 47, dL/maximum H 3.6, S-1 L 83, L/W ratio 8.3, S-2 L 66, L/W ratio 5.3, distance S-1-2, 22, dL ratio S-1/2 1.26; I-L-6 dL 134, central H 23, dL/central H ratio 5.9; L I-L-5/6 ratio 1.27. Female — Idiosoma L 734, W 550; maximum diameter Dgl-3, 23. Coxal shield L 381; Cx-III W 453; Cx-I+II mL 98, Cx-I+II lL 234. Genital field L/W 154/166, genital plates L 120, pregenital sclerite W 75, gonopore L 136, L Ac-1-3: 41-44, 35-38, 31. Gnathosoma — palp total L 362; dL/H, dL/H ratio: P-1, 38/33, 1.14; P-2, 81/56, 1.46; P-3, 91/44, 2.1; P-4, 113/30, 3.8; P-5, 39/14, 2.8; length ratio P-2/P-4 0.72. Chelicera total L 238.
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