Torrenticola recentis Tuzovskij, 2003

Pesic, Vladimir, Semenchenko, Ksenia A. & Lee, Wonchoel, 2013, Torrenticolid water mites from Korea and the Russian Far East, ZooKeys 299, pp. 21-48 : 32-34

Torrenticola recentis Tuzovskij, 2003 Figs 8, 11 A–C

Torrenticola recentis Tuzovskij, 2003: 45.4

Material examined.

SOUTH KOREA: CR1 Seoul, Dobong stream, 37°41.262'N, 127°01.706'E, 19 m asl., 7.x.2012, Pešić & Choi 6/6/0 (1/1/0 mounted, NIBR IV0000268849); CR2 Seoul, Ui-dong stream 37°39.554'N, 127°00.249'E, 114 m asl., 7.x.2012, Pešić & Choi 3[1 juvenile]/0/1; CR4 Seoraksan NP, stream near Temple, 38°10.399'N, 128°29.050'E, 196 m asl., 8.x.2012 Pešić & Karanović 7/2/5; CR7 Odesean NP, stream, 37°49.642'N, 128°42.170'E, 215 m asl., 9.x.2012, Pešić & Karanović 6/6/0 (2/1/0 mounted, NIBRIV0000268850);; CR11 Mudeung Mt., stream, 35°8'50.2584"N, 126°59'18.942"E, 11.x.2012, Pešić & Choi 2/2/1; CR12 JiriSan NP, stream near waterfall, 35°22'47''N, 127°29'10''E, 11.x.2012, Pešić & Choi 4/12[1 juvenile]/0 (1/0/0 mounted); CR14 Duckyu San NP, stream, 35°53'50"N, 127°46'35"E, 11.x.2012, Pešić & Choi 0/2/0. RUSSIA, Primory Territory, Khasansky District, "Kedrovaya Pad National Nature Biosphere Reserve", Sea of Japan basin, Kedrovaya River, 43°06.056'N, 131°33.310'E; depth 12-50 cm; substrate: boulders, cobbles, pebbles; 8.xi.1993, Tiunova 2/2/0 (IBSS).

Morphology.

General features. Idiosoma roundish; dorsal shield with colour pattern as illustrated in Figs 11 A–C; Cxgl-4 subapical; suture line of Cx-IV hardly evident; excretory pore and Vgl-2 only slightly away from the line of primary sclerotization (Fig. 8A); gnathosoma ventral margin strongly curved (Fig. 8F); P-2 longer than P-4, P-2 ventral margin slightly concave, P-4 with well developed ventral protuberance bearing one long and three short setae (Fig. 8E). Male: Medial suture line of Cx-II+III moderately long; genital field subrectangular in shape, ejaculatory complex with small proximal chamber and robust proximal arms (Fig. 8D).

Measurements. Male (from CR1, in parentheses specimen from CR7). Idiosoma (ventral view: Fig. 7A) L 769 (753), W 556 (522); dorsal shield (Figs 7C, 11A-B) L 631 (613), W 450 (446), L/W ratio 1.4 (1.4); dorsal plate L 589 (575); shoulder plate L 195-202 (188-195), W 78 (70-72), L/W ratio 2.5-2.6 (2.6-2.8); frontal plate L 134-138 (136-138), W 58-63 (55-56), L/W ratio 2.1-2.4 (2.4-2.5); shoulder/frontal plate L ratio 1.4-1.5 (1.4). Gnathosomal bay L 152 (159), Cx-I total L 292 (306), Cx-I mL 141 (147), Cx-II+III mL 117 (103); ratio Cx-I L/Cx-II+III mL 2.5 (3.0); Cx-I mL/Cx-II+III mL 1.2 (1.4). Genital field L/W 161 (150) /129 (125), ratio 1.25 (1.2); ejaculatory complex L 189 (193); distance genital field-excretory pore 131 (134), genital field-caudal idiosoma margin 198 (191). Gnathosoma vL 325 (320); chelicera total L 376 (381); palp total L 298 (285), dL: P-1, 34 (34); P-2, 104 (97); P-3, 55 (52); P-4, 91 (88); P-5, 14 (14); P-2/P-4 ratio 1.14 (1.1).

Female (from CR1). Idiosoma (ventral view: Fig. 7B) L 825, W 569; dorsal shield (Fig. 11X) L 672, W 488, L/W ratio 1.38; dorsal plate L 631; shoulder plate L 212-213, W 69, L/W ratio 3.1; frontal plate L 142-144, W 56-59, L/W ratio 2.4-2.5; shoulder/frontal plate L ratio 1.5. Gnathosomal bay L 179, Cx-I total L 320, Cx-I mL 141, Cx-II+III mL 47; ratio Cx-I L/Cx-II+III mL 6.8; Cx-I mL/Cx-II+III mL 3.0. Genital field L/W 191/176, ratio 1.09; egg (n = 1) maximum diameter 222; distance genital field-excretory pore 163, genital field-caudal idiosoma margin 250. Gnathosoma vL 344; chelicera total L 404; palp total L 318-321, dL: P-1, 39; P-2, 110-112; P-3, 56-57; P-4, 97; P-5, 16; P-2/P-4 ratio 1.13-1.16.

Remarks.

The specimens from South Korea fit the description of Torrenticola recentis ,a species described by Tuzovskij (2003) from the Primory Territory in the Russian Far East, and later on reported by Semenchenko (2006) from the River Kedrovaya in the southern part of Primory Territory and from many other southern and northern rivers in the Primory Territory ( Semenchenko 2010). The specimens examined from River Kedrovaya agrees well with our specimens due to colour pattern of dorsal shield and length of medial suture line of Cx-II+III, characters not given by Tuzovskij (2003) in the original description of Torrenticola recentis .

Torrenticola elliptica Maglio, 1909, a species similar in general shape of idiosioma and palps, differs from Torrenticola recentis in a more slender idiosoma, a more extended postgenital area in the male and the ejaculatory complex with a large proximal chamber (see: Di Sabatino et al. 2010). Possibly Torrenticola recentis was misidentified as Torrenticola elliptica in many old records from the Russian Primory Territory (e.g. Sokolow 1934). Likewise, old records from Japan ( Enami 1940) might refer to Torrenticola recentis .

Habitat.

Running waters at low and middle elevations (Figs 14A,D, F).

Distribution.

Far East of Russia (Primory Territory - Tuzovskij 2003, Semenchenko 2006, 2010). New for the fauna of Korea.