Studies on water mites of the family Hygrobatidae (Acari, Hydrachnidia) from Iran, I. The water mite genus Atractides Koch, with the description of five new species Author Pesic, Vladimir Author Saboori, Alireza Author Asadi, Mahdieh Author Vafaei, Reza text Zootaxa 2004 495 1 40 journal article 10.5281/zenodo.157855 2fcc9637-0666-42af-a7ea-47adc189b600 1175­5326 157855 A2244F7C-7DB5-4461-AF1D-85CE04C5EA25 Atractides nahavandii Schwoerbel & Sepasgozarian, 1976 ( Figs. 66–71 ) Type series: Holotype ɗ, Typ. P. J/22, Atractides (s.str) nahavandii . ɗ. Brook Avarde near Shandiz, Mashad, 30.09.1974 , coll. Schwoerbel. Paratype : Ψ, P. J/23. Allotyp, label and state as holotype . Diagnosis : dorsal integument: finely striated; muscle attachments: unsclerotized. I­L: I­L­5 with S­1/2 closely to each other, I­L­6 stout, distally thickened, in the center narrowed. Genital field: Ac in a weakly curved line; excretory pore: smooth; Vgl­1: not fused to Vgl­2. Palp: weak sexual dimorphism, P­4 sword seta inserted halfway between ventral hairs. Description: Male (in parentheses data from Schwoerbel & Sepasgosarian 1976 ): Length of idiosoma (448), width (304). Dorsally the integument is finely striated; muscle attachments: unsclerotized. Coxal field ( Fig. 66 ): length between anterior end of first coxae and posterior end of fourth coxae 255; Cx­3 width 278; Cx­1+2 medial suture 100 in length; distance from lateralmost tips of Cx­2 to the medioposterior edge of Cx­1+2 195. Measurements of mouthparts: palp total length 221, dorsal length and relative length (% total length, in parentheses) of single segments: P­1 24 (10.9), P­2 54 (24.4), P­3 52 (23.5), P­4 65 (29.4), P­5 26 (11.8); length ratio P­2/P­4 is 0.83; palp ( Fig. 67­68 ): P­2 ventral margins distally protruding, sword seta inserted halfway between ventral hairs. Genital field ( Fig. 66 ): anterior margin convex; 83 in length, 86 in width, Ac­1­3 length 24:23:29­ 35; excretory pore smooth; Vgl­1: separated from Vgl­2. I­L ( Fig. 70 ): I­L­5 with S­1/2 closely to each other, I­L­6 stout, distally thickened, in the center narrowed; I­L­5 dorsal length 109, I­L­5 central height 48, ratio dorsal length I­ L­5/central height 2.24, S­1 length 55, ratio length S­1/width 13.5, S­2 length 51, ratio length S­2/ width 11.6, distance between sword setae of I­L­5 2; ratio length S­1/2 1.08; I­ L­6 length 99, I­L­6 central height 32, ratio length I­L­6/central height 3.09; ratio length I­ L­5/6 1.1 Female (in parentheses data from Schwoerbel & Sepasgosarian 1976 ): Length of idiosoma (544), width (416). Dorsally the integument is finely striated; muscle attachments: unsclerotized. Coxal field: length between anterior end of first coxae and posterior end of fourth coxae 292; Cx­3 width 352, Cx­1+2 width 273; Cx­1+2 medial suture 119 in length; distance from lateralmost tips of Cx­2 to the medioposterior edge of Cx­1+2 227. Measurements of mouthparts: palp total length 291, dorsal length and relative length (% total length, in parentheses) of single segments: P­1 24 (8.3), P­2 70 (24.0), P­3 78 (26.8), P­4 86 (29.6), P­5 33 (11.3); length ratio P­2/P­4 is 0.81. Genital field ( Fig. 69 ): 131 in length, 129 in width, Ac­1­3 length 36­33­34; excretory pore smooth; Vgl­1: separated from Vgl­ 2. FIGURES 66–71. Atractides nahavandii Schwoerbel & Sepasgozarian, 1976 , (66–68, 70 = male; 69,71 = female): 66 = idiosoma, ventral view; 67–68 = palp; 69 = genital field; 70 = I­L­5/6; 71 = I­ L­5/6. Scale bars = 0.1 mm. I­L ( Fig. 71 ): I­L­5 dorsal length 145, I­L­5ventral length 111, ratio dorsal length I­L­ 5/ventral length 1.3, I­L­5 central height 47, ratio dorsal length I­L­5/central height 3.08, S­1 length 68, ratio length S­1/width 9.8, S­2 length 60, ratio length S­2/width 6.3, distance between sword setae of I­L­5 3.5; ratio length S­1/2 1.13; I­L­6 length 116, I­L­6 central height 32, ratio length I­L­6/central height 3.63; ratio length I­L­5/6 1.25. Remarks : Schwoerbel & Sepasgosarian (1976) compared A. nahavandii with A. nodipalpis , a species similar in the protruding ventral margin of P­ 2 in male. As stated by Schwoerbel and Sepasgosarian, A. nahavandii is easily distinguished by the more longish I­L. A. nahavandii is unique among all species with striated integument unsclerotized excretory pore and unfused Vgl­1/2, in the combination of a rather short I­L­5, and as a consequence L ratio I­L­5/6 <1.25, a thickened I­L­6 (L/HB I­L­6 3.0­3.7), short setae S­ 1/2, similar in shape and placed closely together, and a weakly developed ventrodistal projectionof P­ 2 in both sexes. From A. nodipalpis , the only species discussed in the original description, both sexes of differ in the homoiomorphic, little distant setae S­1/2, a strongly curved, but stocky I­L­6, palpus with weak sexual dimorphism and a smaller Ac. The only further striated species in Iran with a little modified I­L with homoiomorphic, relatively short and little distant setae S­1/2 is Atractides mirkopesici sp. nov. From A. nahavandii , A. mirkopesici sp. nov. is easily distinguished by the relatively shorter I­L­ 5, a more stout I­L­6 and the ventral margin of P­2 is straight, not distally slightly protruding. Distribution : Iran ; only known from the locus typicus .