Limnesia (Limnesia) papillosa Viets, 1935

Yi, Tianci & Jin, Daochao, 2009, Water mites of the genus Limnesia Koch, 1836 (Acari: Hydrachnidia, Limnesiidae) from China, with description of four new species, Zootaxa 2234, pp. 21-38 : 31

Limnesia (Limnesia) papillosa Viets, 1935

Figure 6 , A–I

Metrial examined One male from a plunge pool, Mayang River National Nature Reserve, Yanhe County, Guizhou Province, 30 September 2007, leg. Yi Tianci; one male and four female from a stream, Jinyunshan National Nature reserve, Beibei, Chongqing City, 7 May 2008, leg. Yi Tianci, 106º23´62"E, 29º50´39"N, altitude, 503m; 14 males and 21 females from a stream, Chishui County, Guizhou Province, 27 May 2000, leg. Guo Jianjun. One male and one female from Chishui City were dissected and slide-mounted.

Description Male Body soft and smooth, 571 in length, 487 in width; dorsum with a pair of small anterior platelets and a single small posterior plate between D3, which 42 in length and 25 in width; A1, with short and stout seta, on the anterior end of body; O1 anterior to anterior-lateral eyes, A2 and posterior-lateral eyes at the same level; coxae occupying about half of the ventral surface; infracapitular bay V-shaped, much less than half of median margins of CxI; medial margins of CxI 82 in length; CxI separated but close to each other, ACG with well developed posterior apodemes; gap between ACG and PCG small; E4 located on midland of CxIII; medial margins of CxIII extended with moderated secondary sclerotization; distance between CxIII median angles (including the secondary sclerotization) 38; posterolateral sides of genital field extramely outstretched and straw hat-shaped or somewhat isosceles triangle-like, 145 in length, 254 in width; three pairs of acetabula, the first oblong oval-shaped, the second and the third somewhat triangle-shaped, the second lateral to the third one; prostgential sclerite extended posteriorly and cauda-shaped; V1, V3 and posterior margin of genital plate at the same level; chelicera as shown in Figure 6 -G, 202 in length, chelicera claw 63 in length; proportion and chaetotaxy of palp as shown in Figure 6 -E; P-II stout and distal ventral surface inflated, with peg-like seta, 18 in length; ventral side of P-IV with two long hair-like setae; dorsal lengths of P-I to P-V: 11, 58, 63, 95, 33; IV-L-6 with three strong setae, and a subterminal seta, 95 in length; dorsal lengths of I-L-3 to 6: 71, 81, 75; dorsal lengths of IV-L-3 to 6: 94, 131, 123, 98; III-L-4 with 3, III-L-5 with 4, IV-L-4 with 4 and IV-L-5 with 4 swimming hairs.

Female Body soft and smooth, 667 in length, 503 in width; the shape of dorsum and coxae similar to male; medial margins of CxI 88 in length; distance between CxIII median angles (including the secondary sclerotization) 55; genital plates (including pregenital sclerite) 183 in length and 109 in width; three pairs of genital acetabula, chelicera 234 in length, chelicera claw 71 in length; the characters of palp similar to male; dorsal lengths of P-I to P-V: 19, 75, 61, 110, 35; dorsal lengths of I-L-3 to 6: 55, 75, 93, 76; dorsal lengths of IV-L-3 to 6: 101, 158, 141, 120; III-L-4 with 4, III-L-5 with 5, IV-L-4 with 6 and IV-L-5 with 6 swimming hairs.

Remarks Previously, the species was known from nymphs by K. Viets (1935), the adults were then reported by Lundlad (1971). Uchida (1937) described the species from Japan; however, K.O. Viets (1987) noted that the species described by Uchida was not Limnesia (Limnesia) papillosa Viets, 1935 . The species is first reported from China. It can be easily identified by isosceles triangle-like genital field, of which the width is much longer than the length.

Figures

FIGURE 6. Limnesia papillosa Viets, 1935 A—idiosoma, ventral view, male, B—idiosoma, ventral view, female, Cgenital field, male, D—genital field, female, E—palp, lateral view, male, F—palp, lateral view, female, G—chelicera, lateral view, male, H—infracapitular, lateral view, male, I—IV-L- 5, 6, male. Bars = 100 Μm.