Torrenticola (Torrenticola) neodentifera, Pesic, Vladimir, Semenchenko, Ksenia A. & Lee, Wonchoel, 2015

Pesic, Vladimir, Semenchenko, Ksenia A. & Lee, Wonchoel, 2015, Further studies on water mites from Korea, with description of two new species (Acari, Hydrachnidia), ZooKeys 507, pp. 1-24 : 4-5

Taxon classification Animalia Trombidiformes Torrenticolidae

Torrenticola (Torrenticola) neodentifera sp. n. Figs 4, 5, 6

Torrenticola dentifera Pešić et al. 2013: 25, figs 2, 7B. Synonymy.

Type series.

Holotype male (NIBR), dissected and slide mounted, SOUTH KOREA: CR21 Chungcheongbuk Province, Woraksan NP, Jungseonam, River exposed to sunlight, sand, gravel substrate, 36°52.644'N, 128°17.784'E, 25.v.2013 Pešić & Karanović. Paratype (NIBR): one female, CR22 Gangwon Province, Chiaksan NP, Silim town, stream shaded, stones, gravels, 37°17.081'N, 128°15.389'E, 25.v.2013 Pešić & Karanović, dissected and slide mounted.

Diagnosis.

Idiosoma dimensions relatively large (L 580-630); dorsal shield with colour pattern as illustrated in Fig. 5A; P– 2 with a laterally compressed, anteriorly directed ventrodistal extension; P-3 with a broad, subrectangular ventrodistal projection.

Description.

General features - Idiosoma elongated; dorsal shield with colour pattern as illustrated in Fig. 6A,C; frontal platelets anteriorly bulging (Figs 4A, 5A); gnathosomal bay V-shaped; Cxgl-4 subapical, only slightly posterior of Cx-I tips; medial suture line of Cx-II+III long; posterior suture line of Cx-IV in its medial part perpendicular to the longitudinal body axis, laterally distinctly curving anteriorly; excretory pore and Vgl-2 on the line of primary sclerotization near posterior idiosoma margin; gnathosoma ventral margin only slightly curved, rostrum well developed; P-2 shorter than P-4, ventral margin of P-2 with a fine denticulation also in proximal half of the segment, distally with a laterally compressed, anteriorly directed hyaline extension and a very short, denticle-like seta laterally at base of projection; P-3 with a broad, subrectangular, apically serrated ventrodistal projection with a fine denticles, and a short seta laterally at base of projection; P-4 ventral tubercles well developed and separated (Figs 4C, 5C). Male. Genital field subrectangular; ejaculatory complex conventional in shape (Fig. 2D in Pešić et al. 2013). Female. The short postgenital area and caudal position of the excretory pore (Fig. 5B) in the specimen from Korea are due to the obviously juvenile age (indicated by weak sclerotization and absence of eggs); genital field pentagonal in shape.

Measurements. Male - Idiosoma (ventral view: Figs 4B, 6B) L 628, W 365; dorsal shield (Figs 4A, 6A) L 516, W 331, L/W ratio 1.56; dorsal plate L 477; shoulder platelet L 141-143, W 41-44, L/W ratio 3.2-3.5; frontal platelet L 106-109, W 46-47, L/W ratio 2.3; shoulder/frontal platelet L ratio 1.29-1.35. Gnathosomal bay L 81, Cx-I total L 200, Cx-I mL 118, Cx-II+III mL 127; ratio Cx-I L/Cx-II+III mL 1.58; Cx-I mL/Cx-II+III mL 0.93. Genital field L/W 116/98, ratio 1.18; ejaculatory complex L 162; distance genital field-excretory pore 162, distance genital field-caudal margin 184. Gnathosoma vL 256; chelicera total L 270; palp: total L 239, dL/H, dL/H ratio: P-1, 22/21, 1.05; P-2, 65/39, 1.7; P-3, 49/35, 1.4; P-4, 86/19, 4.6; P-5, 17/11, 1.6; P-2/P-4 ratio 0.76.

Female - Idiosoma (ventral view: Figs 5B, 6D) L 581, W 353; dorsal shield (Figs 5A, 6C) L 472, W 303, L/W ratio 1.56; dorsal plate L 439; shoulder platelet L 144-150, W 38-42, L/W ratio 3.4-4.0; frontal platelet L 103-105, W 44-56, L/W ratio 1.8-2.4; shoulder/frontal platelet L ratio 1.37-1.46. Gnathosomal bay L 94, Cx-I total L 206, Cx-I mL 110, Cx-II+III mL 87; ratio Cx-I L/Cx-II+III mL 2.37; Cx-I mL/Cx-II+III mL 1.26. Genital field L/W 116/126, ratio 0.92; distance genital field-excretory pore 150. Gnathosoma vL 252; chelicera total L 258-262; palp: total L 225, dL/H, dL/H ratio: P-1, 19/20, 0.95; P-2, 63/37, 1.7; P-3, 49/32, 1.54; P-4, 79/20, 4.0; P-5, 15/10, 1.5; P-2/P-4 ratio 0.8.

Etymology.

Named for its similarity with Torrenticola dentifera Wiles, 1991.

Remarks.

Pešić et al. (2013) collected a single male from a stream in Naebyeansan National Park, South Korea and assigned it to Torrenticola dentifera . This specimen is in perfect agreement with specimens examined in our study. In the original description of Torrenticola dentifera , a species described on the basis of two males from Selangor, Peninsular Malaysia ( Wiles 1991), no information on colour pattern of dorsal shield and shape of ejaculatory complex are given. At the present state of art, males of Torrenticola dentifera can be distinguished from the new species by smaller dimensions of idiosoma and palps, and a more slender ventrodistal projection on P-3.

Habitat.

A permanent sandy/bouldary stream, shaded by riparian vegetation (Fig. 13 C–D).

Distribution.

Korea (" Torrenticola dentifera " Pešić et al. 2013, this study).