Torrenticola kimichungi, Pesic, Vladimir, Semenchenko, Ksenia A. & Lee, Wonchoel, 2013

Pesic, Vladimir, Semenchenko, Ksenia A. & Lee, Wonchoel, 2013, Torrenticolid water mites from Korea and the Russian Far East, ZooKeys 299, pp. 21-48 : 24-29

Torrenticola kimichungi sp. n. Figs 3, 4, 7 C–F

Type series.

Holotype male (NIBRIV0000268846), dissected and slide mounted, SOUTH KOREA: CR4 Seoraksan NP, stream near Temple, 38°10.399'N, 128°29.050'E, 196 m asl., 8.x.2012 Pešić & Karanović. Paratype: same data as holotype, one male (NIBRIV0000268847); RUSSİA, Primory Territory, Partizansky District, Partizanskay River basin, Tigrovaya River, 43°11.401'N, 133°12.660'E; depth 30 cm below the sediment surface; substrate: cobbles, pebbles, sand; 12.vi.2010, Semenchenko & Sidorov, three males (490-492- kas–IBSS), two females (493-494- kas–IBSS), dissected and slide mounted.

Diagnosis.

Idiosoma elongated (dorsal shield L/W ratio 1.5-1.6); medial suture line of Cx-II+III in male short (L 74-85 μm); suture line of Cx-IV extended posterior to the genital field; excretory pore posterior to the line of primary sclerotization, Vgl-2 posterior to excretory pore; male genital field with maximum width at the anterior margin; gnathosoma deep with a short rostrum; P-4 with ventral setae on flat hump.

Description.

General features. Idiosoma elongated; Cxgl-4 subapical; suture line of Cx-IV evident and curved, starting posterior from genital field, laterally curved anteriorly (Figs 3B, 4B); excretory pore posterior to the line of primary sclerotization, Vgl-2 posterior to excretory pore; gnathosoma deep with a short rostrum not evidently set off from gnathosomal base (Fig. 3F); P-2 ventrally slightly convex, ventrodistal projection cone-shaped, pointed towards distal, P-3 with ventrodistal projection slightly larger than projection of P-2, P-4 slightly curved, ventral setae (one long and three short) on flat hump (Figs 3 D–E, 4C). Male: Medial suture line of Cx-II+III short; genital field with maximum width at the anterior margin; ejaculatory complex normal in shape (Fig. 3C); P-2 and P-4 almost equal in length.

Measurements. Male (holotype, in parentheses measurements of paratype from South Korea, in square parentheses specimens from Russia, n = 2): Idiosoma (ventral view: Fig. 3B) L 723 (741) [731-748], W 477 (513) [488-578]; dorsal shield (Figs 3A, 7 C–E) L 628 (650) [607-663], W 414 (444) [409-425], L/W ratio 1.52 (1.46) [1.47-1.56]; dorsal plate 575 (596) [554-595]; shoulder plate L 166-169 (163-166) [161-167], W 72-75 (73) [72-79], L/W ratio 2.2-2.3 (2.2-2.3) [2.11-2.24]; frontal plate L 131-134 (127-131) [125-126], W 72 (69-73) [62-72], L/W ratio 1.8-1.9 (1.7-1.9) [1.75- 2.0]; shoulder/frontal plate L ratio 1.24-1.29 (1.27-1.28) [1.28-1.33]. Gnathosomal bay L 122 (125) [112-119], Cx-I total L 231 (244) [231-237], Cx-I mL 109 (119) [118-119], Cx-II+III mL 75 (85) [74-79]; ratio Cx-I L/Cx-II+III mL 3.1 (2.9) [2.91-3.2]; Cx-I mL/Cx-II+III mL 1.45 (1.4) [1.5-1.58]. Genital field L/W 138 (148) [145-152]/122 (125) [112-114], L/W ratio 1.12 (1.18) [1.26-1.36]; ejaculatory complex L 183 (184) [180-200]; distance genital field-excretory pore 166 (163) [152-172], genital field-caudal idiosoma margin 266 (263) [251-257]. Gnathosoma vL 191 (198) [194-211]; chelicera total L 234 (231) [231-232]; palp total L 215 (210) [210-216], dL: P-1, 25 (21) [24-27]; P-2, 62 (61) [59-62]; P-3, 43 (42) [43-46]; P-4, 60 (63) [62-63]; P-5, 25 (23) [19-21]; P-2/P-4 ratio 1.03 (0.97) [0.94-1.0].

Female (from Russia, n = 2). Idiosoma (ventral view: Fig. 4B) L 800-816, W 544-580; dorsal shield (Figs 4A, 7F) L 714-731, W 476-493, L/W ratio 1.45-1.54; dorsal plate L 650-663; shoulder plate L 174-185, W 72-74, L/W ratio 2.34-2.57; frontal plate L 132-133, W 71-72, L/W ratio 1.83-1.86; shoulder/frontal plate L ratio 1.32-1.4. Gnathosomal bay L 119-132, Cx-I total L 231-244, Cx-I mL 112-113, Cx-II+III mL 39-46; ratio Cx-I L/Cx-II+III mL 5.02-6.25; Cx-I mL/Cx-II+III mL 2.43-2.9. Genital field L/W 174-178/162-165, L/W ratio 1.05-1.09; distance genital field-excretory pore 160-198, genital field-caudal idiosoma margin 310-330. Gnathosoma vL 218-264; chelicera total L 244; palp total L 220-228, dL: P-1, 24-27; P-2, 66-70; P-3, 46-48; P-4, 64-65; P-5, 18-20; P-2/P-4 ratio 1.01-1.08.

Etymology.

The species is named after Drs Il-Hoi Kim and Kyung-Sook Chung in appreciation of their studies of the Korean water mites.

Remarks.

The new species belongs to the group of species characterized by having well-developed finger or peg-like ventrodistal tubercles on P-2 and P-3, the deep gnathosoma with a short rostrum, not evidently set off from gnathosomal base and a relatively short medial suture line of Cx-II+III in male. This group includes the following Asian species of Torrenticola : Torrenticola brevirostris (Halbert, 1911) (Palaearctic), Torrenticola nanshihensis Pešić et al., 2011 (Taiwan), Torrenticola projectura Pešić et al., 2012 (Taiwan), Torrenticola retractipora Lundblad, 1969 (Burma), Torrenticola siamis Pešić & Smit, 2009 (Thailand), and Torrenticola subterranea Imamura, 1957 (Japan). Males of Torrenticola brevirostris and Torrenticola nanshihensis differ in a prominent suture line of Cx-IV starting at a right angle from the genital field, excretory pore on the same level as Vgl-2 and more away from the line of primary sclerotization and P-4 stockier with well developed ventral tubercles (see: Di Sabatino et al. 2010 for Torrenticola brevirostris , and Pešić et al. 2012 for Torrenticola nanshihensis ). Torrenticola projectura clearly separates in having P-3 with a long tapering ventral protrusion which curves distally ( Pešić et al. 2012a). Males of Torrenticola retractipora can easily be distinguished by larger dimensions of the idiosoma, a differently shaped ejaculatory complex with large proximal chamber (see: Lundblad 1969), and a moderately long median suture line of Cx-II+III (101 μm, data taken from Wiles 1997). Torrenticola subterranea , a weakly defined species known from subterranean habitats in Japan ( Imamura 1957, 1959) is similar in Cx-IV extended posterior to the genital field, but differs in narrower frontal platelets, excretory pore and Vgl-2 lying on the margin of primary sclerotization, and a less developed distoventral projections on P-2 and P-3 (see: Imamura 1959). Torrenticola siamis closely resembles Torrenticola kimichungi sp. n. in the general shape of idiosoma and palp, but males are distinguishable in having Cx-IV not extended posterior to the genital field and the genital field more elongated (L/W ratio 1.4, data taken from Pešić and Smit 2009) and rectangular in shape.

Habitat.

A permanent sandy/bouldery stream with considerably exposure to sunlight (Fig. 14C); the specimens from Russia were collected from interstitial waters.

Distribution.

South Korea, Far East of Russia (present study).