Brachypoda sokolowi, Pešić, Vladimir & Semenchenko, Ksenia, 2014

Pešić, Vladimir & Semenchenko, Ksenia, 2014, Water mites of the genus Brachypoda Lebert, 1879 (Acari: Hydrachnidia: Aturidae) from South Korea and the Russian Far East, Zootaxa 3753 (4), pp. 335-346 : 339-341

Brachypoda sokolowi sp. n.

( Figs. 3A–D , 4A–B , 5A–D )

Material examined. Holotype: male (299-kas IBSS), RUSSIA: Amurskaya Province, Magdagachinsky District, Levaya Burinda River, 53°27.731'N, 125°07.808'E; depth 0,2– 1 m; substrates: coarse-grained sand, 21.vii.2006, Semenchenko & Sidorov. Paratypes: one female (307-kas– IBSS), same data as holotype.

Diagnosis. Male. Tip of Cx-I extending beyond frontal idiosoma margin; 3–4 long, curved setae at the lateral margin of genital field; IV-L-5 thickened, in proximal half with a group (8–9) heavy, short ventral setae; IV-L-6 with two very long, whip-like setae and one toothed seta inserting at distal margin; anterior claw 1.5 times longer than posterior claw. Female. Tip of Cx-I not reaching frontal idiosoma margin; number of swimming setae: II-L-5, 3, III-L-5, 4, IV-L-5, 3.

Male (holotype): Idiosoma L/W 464/345; dorsal shield L/W 436/343, excretory pore and flanking glandularia on dorsal shield, near posterior margin ( Fig. 3A ). Tip of Cx-I extending beyond frontal idiosoma margin ( Fig. 3B ); distance tip Cx-I – gonopore 352; gnathosomal bay L 106; distance between IV-L insertions 150; posterior margin of Cx-IV forming a transverse ridge, flexuous in medial part, with a row of four short setae between Ac-1 and Ac- 2. No ridges anterolaterally to genital field, gonopore L/W 31/20, in a deep pit surrounded in distal part by sclerotized lips and laterally flanked by acetabula arranged in a curved line, 3–4 long curved setae at the lateral margin of genital field. Gnathosoma vL 62, L with apodemes 90; chelicera ( Fig. 3C ) total L 108, basal segment L 78, claw L 30. Palp ( Fig. 3D ): total L 255, L/H, ratio L/H: P-1, 35/21, 1.6; P-2, 57/48, 1.19; P-3, 42/30, 1.34; P-4, 92/32, 2.8; P-5, 29/11, 2.5; P-1 with one dorsal seta; P-2 with rounded distoventral extension (not obvious in figure 3D due to the oblique position of the palp); P-3 ventral margin concave; P-4 ventral margin appears convex due to the position of the palp, but in reality proximally narrowed and has an elevated projection near the insertion of the stronger ventral seta (as in female, see Fig. 5C ). Legs: IV-L-4–6 as shown in Figs. 4A–B ; IV-L-4 enlarged from base to tip, IV-L-4 L/H 82–85/57–61, ratio 1.44; IV-L-5 thickened, in proximal half with 8–9 short, ventral setae, distally with two long, whip-like setae, IV-L-5 L/H 146–150/64–65, ratio 2.3; IV-L-6 with two very long, whip-like setae and one toothed seta inserting at distal margin, IV-L-6 L/H 134–133/33–34, ratio 4.0; anterior claw 1.5 times longer than posterior claw.

Female (paratype): Idiosoma L/W 561/422; dorsal shield L/W 530/383, excretory pore and flanking glandularia on transversal plate posterior to dorsal shield ( Fig. 5A ). Tip of Cx-I not reaching frontal idiosoma margin ( Fig. 5B ); L of ventral shield from tip Cx-I 469; gnathosomal bay L 118; distance between IV-L insertion 224. Genital plates L/W 81/35, transversal, each with 3 acetabula and 3–4 short, thin setae. Gnathosoma vL 67, L with apodemes 95; chelicera total L 132, basal segment L 97, claw L 35. Palp ( Fig. 5C ): total L 249, L/H, ratio L/ H: P-1, 38/22, 1.7; P-2, 56/51, 1.1; P-3, 40/32, 1.25; P-4, 89/35, 2.5; P-5, 26/12, 2.16. Legs: number of swimming setae: II-L-5, 3, III-L-5, 4, IV-L-5, 3; IV-L unmodified, IV-L-4 L/H 116/35, ratio 3.31; IV-L-5 L/H 130/32, ratio 4.0; IV-L-6 L/H 119/27, ratio 4.4; claws with 3 clawlets ( Figs. 5D ).

Etymology. The species is named after Professor Ivan Ivanovich Sokolow in appreciation of his studies on water mites of the Russian Far East.

Discussion. See discussion under Brachypoda milicaae sp. n.

Habitat. A river with pebble and coarse-grained sand ( Fig. 9E ).

Distribution. Far East of Russia, known only from the locus typicus.

Figures

FIGURE 3 A – D. Brachypoda sokolowi sp. n., male: A = dorsal shield; B = idiosoma, ventral view; C = chelicera; D = palp. Scale bars = 100 Μm (A – B), 25 Μm (C – D).

FIGURE 4 A – B. Brachypoda sokolowi sp. n., male: A = IV-L; B = IV-L- 4 – 6. Scale bar = 100 µm.

FIGURE 5 A – D. Brachypoda sokolowi sp. n., female: A = dorsal shield; B = idiosoma, ventral view; C = palp; D = IV-L- 4 – 6. Scale bars = 100 Μm (A – B, D), 25 Μm (C).

FIGURE 9 A – E. A – B Photographs of Brachypoda rubidata Kim & Chung, 1996, male: A = idiosoma, ventral view; B = idiosoma, dorsal view. C – E Photographs of sampling sites: C = CR 9 (stream in Naebyeansan NP, South Korea, locus typicus of Brachypoda milicaae sp. n.; D = CR 10 (pool near stream in Naebyeansan NP, South Korea, sampling site of Brachypoda rubidata Kim & Chung, 1996); E = Levaya Burinda River, Russia, locus typicus of Brachypoda sokolowi sp. n. and B. rossica sp. n. Photos. V. Pešić (Figs. A – D), K. Semenchenko (Fig. E).