Torrenticola ussuriensis (Sokolow, 1940)

Pesic, Vladimir, Semenchenko, Ksenia A., Chatterjee, Tapas, Yam, Rita S. W. & Chan, Benny K. K., 2011, New records of water mites of the family Torrenticolidae (Acari, Hydrachnidia) with descriptions of two new species from Nanshih River system in Taiwan and redescription of Torrenticola ussuriensis (Sokolow, 1940) from the Russian Far East, ZooKeys 116, pp. 1-14 : 4-6

Torrenticola ussuriensis (Sokolow, 1940) Figs 4 A–B 5

Material examined.

Russia, Primory Territory: Anuchinsky District, 10 km from Vinogradovka, Arsen’evka River, 43°48.261'N, 132°56.407'E, 13.ix.2008, K.A. S emenchenko & D.A. Sidorov 0/1/0; Anuchinsky District, Arsen’evka River near Kornilovka, 43°07.757'N, 133°13.280'E, 03.vi.2009, K.A. Semenchenko & D.A. Sidorov 1/6/0; Khabarovsk Territory, Bikinsky District, Bikin River, 46°46.531'N, 134°17.026'E, 17.vi.2005, K.A. Semenchenko & D.A. Sidorov 0/2/0; Jewish Autonomous Area, Birobidzhansky District, 4 km from Zholty Yar, Bira River, 48°32.373'N, 133°01.664'E, 16.vii.2005, K.A. Semenchenko & D.A. Sidorov 1/2/0; Amurskaya Area, Mazanovsky District, Zeya River, 51°40.034'N, 128°51.265'E, 06.viii.2006, K.A. Semenchenko & T.M. Tiunova 0/2/0.

Morphology.

Male (n = 2). Idiosoma (ventral view: Fig. 5B) L 697-748, W 548-554; dorsal shield (Fig. 5A) L 581-620, W 435-482, L/W ratio 1.28-1.33; dorsal plate L 508-541; dorsal plate with colour pattern as illustrated in Fig. 4A; frontal plate L 119-135, W 44-46, L/W ratio 2.5-3; gnathosomal bay L 110-118, Cx-1 total L 257-264, Cx-1 medial L 152-158, Cx-2+3 medial 72-74; ratio Cx-1 L/Cx-2+3 medial L 3.5; Cx-1 medial L/Cx-2+3 medial L 2-2.19; Cxgl-4 posterior to Cxgl-2, distance between glandular openings of Cxgl-4 and Cxgl-2 48-60; genital field L/W 154 –173/118– 121, L/W ratio 1.3-1.43, ejaculatory complex conventional in shape, L 153-189; distance genital field–excretory pore 138-165, genital field–caudal idiosoma margin 185-232; capitulum ventral L 302-310; chelicera total L 356-372; palp (Fig. 5D) total L 300-303, L: P-1 32-38, P-2 101-102, P-3 58-59, P-4 89-94, P-5 16-17; P-2/P-4 ratio 1.08-1.12; distal margin of P-3 with denticles; P-4 with four well developed ventral tubercles.

Female (n = 2). Idiosoma (ventral view: Fig. 5C) L 782-816, W 594-595; dorsal shield L 643-673, W 468-488, L/W ratio 1.36-1.37; dorsal plate L 547-607; dorsal plate with colour pattern as illustrated in Fig. 4B; frontal plate L 130-132, W 35-40, L/W ratio 3.3-3.7; gnathosomal bay L 125-145, Cx-1 total L 264-284, Cx-1 medial L 140-152, Cx-2+3 medial 46-47; ratio Cx-1 L/Cx-2+3 medial L 5.62-6.16; Cx-1 medial L/Cx-2+3 medial L 3-3.23; distance between glandular openings of Cxgl-4 and Cxgl-2 48-54; genital field L/W 167 –172/138– 140, L/W ratio 1.19-1.25; distance genital field–excretory pore 191-204, genital field–caudal idiosoma margin 270-363; capitulum ventral L 350-356; chelicera total L 420-435; palp total L 354-358, L: P-1 46-48, P-2 116-119, P-3 69-70, P-4 102-103, P-5 18-21; P-2/P-4 ratio 1.13-1.16; shape and setation as in male.

Remarks.

Torrenticola ussuriensis was described from the Primory Territory, in Russian Far East ( Sokolow 1934) and later reported from Uzi region in Japan ( Enami 1940). The specimens from Japan agree with the material from the Far East of Russia in the shape of dorsal shield (e.g., the angle of dorsal plate between the frontal plates pointed, the anterior part of the dorsal plate lying between the traces of the shoulder plates delimitation narrow and the angles of the traces of shoulder plates delimitation posterior to setae Dgl-3 pronounced, see: Enami 1940, Figs 19, 21) and shape of palp (P-3 distal margin with denticles, P-4 relatively short, L P-2/P-4 ratio 1.2 in male, data taken from Enami 1940). However, because some characters (e.g., distance between the glandular openings of Cxgl-4 and Cxgl-2) were lacking in original description, additional specimens are required to confirm that the specimens from Japan are conspecific with Torrenticola ussuriensis .

Distribution.

Far East of Russia (Primory and Khabarovsk Territory, Jewish Autonomous and Amurskaya Area - Sokolow 1934; present study); Japan (Uzi region - Enami 1940).