Torrenticola schilthuizeni Pešić & Smit 2014, n. sp.
Creators: name: Pešić, Vladimir
name: Smit, Harry
Publisher: name: Zenodo
Year: 2014
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Trombidiformes
Torrenticolidae
Torrenticola
Torrenticola schilthuizeni

description: Torrenticola schilthuizeni n. sp.
(Figs. 15A–D, 16F, 17F)
Type series. Holotype female, dissected and slide mounted, Malaysia, Borneo, Kibamabangan River, Crocker Range, 5º 51.28 N, 116 º 08.417 E, alt. 433 m asl., 18.ix.2012 Smit.
Diagnosis (Male unknown). Idiosoma roundish (dorsal shield L/W ratio 1.2); Cxgl–4 subapical, only slightly posterior of Cx-I tips; P-2 with a laterally compressed, longish (> 30% of ventral margin), anteriorly directed ventrodistal extension; P-3 with a very long seta laterally at base of projection.
Description
Female. General features —Idiosoma roundish; gnathosomal bay U-shaped, proximally pointed; Cxgl–4 subapical, only slightly posterior of Cx-I tips; genital field pentagonal; suture lines of Cx-IV extending back beyond posterior margin of genital field, laterally curved; excretory pore away from the line of primary sclerotization, excretory pore slightly posterior from Vgl-2; gnathosomal rostrum long, ventral margin in lateral view slightly curved (Fig. 15D); P-2 slightly longer than P-4, P-2 ventral margin with a denticulation also in proximal half of the segment, distally with a laterally compressed, longish (>30% of ventral margin), anteriorly directed and apically serrated hyaline extension with and a very short, denticle-like seta laterally at base of projection; P-3 with a longish, subrectangular, apically serrated ventrodistal projection, and a very long seta laterally at base of projection; P-4 slender, with ventral tubercles pointed and separated, bearing one long and three short setae (Fig. 15C).
Measurements —Idiosoma (ventral view: Figs. 15B, 17F) L 578, W 434; dorsal shield (Figs. 15A, 16F) L 448, W 362, L/W ratio 1.24; dorsal plate L 403; shoulder plate L 148, W 59–93, L/W ratio 2.4–2.5; frontal plate L 116, W 53–56, L/W ratio 2.05–2.2; shoulder/frontal plate L 1.28. Gnathosomal bay L 119, Cx-I total L 256, Cx-I mL 137, Cx-II+III mL 42; ratio Cx-I L/Cx-II+III mL 6.1; Cx-I mL/Cx-II+III mL 3.3. Genital field L/W 124/120, ratio 1.04; distance genital field-excretory pore 106, genital field-caudal idiosoma margin 153. Gnathosoma vL 291; chelicera total L 326; palp total L 238–239, dL/H, dL/H ratio: P-1, 28/25, 1.12; P-2, 71/47, 1.49; P-3, 55/39, 1.4; P-4, 68–69/20, 3.4; P-5, 16/11, 1.5; P-2/P-4 ratio 1.03.
Male: unknown.
Etymology. Named after Menno Schilthuizen, leader of the Mt Kinabula-Crocker Range expedition.
Discussion. Due to the Cxgl–4 subapical and P-2 ventral margin distally with a laterally compressed, anteriorly directed ventrodistal extension and a denticulation also in proximal half of the segment, the new species resembles Torrenticola tjiwalensis (K. Viets, 1935) and T. dentifera Wiles, 1991. The latter species, originally described from Selangor, Peninsular Malaysia (Wiles 1991), and later on found in South Korea (Pešić et al. 2013b), is known only from the male sex. It can easily be distinguished from the new species in having a short ventral seta on P-3 and P-4 with long and broadly rounded distal seta. Torrenticola tjiwalensis (Java, Peninsular Malaysia, Borneo) resembles the new species in having a long ventral seta on P-3 (longer than P-3) but differs in a small, rudimentary flange ventrally on P-2 (see Wiles 1997). Further differences are found in a more elongated dorsal shield, excretory pore and Vgl-1 shifted more away from the line of primary sclerotization and a less shallow gnathosoma with a relatively more shortened rostrum in the female of T. tjiwalensis (see K. Viets 1935)
Habitat. Sandy/bouldery streams, shaded by rain forest (Fig. 43C).
Distribution. Borneo; known only from the locus typicus.
Subgenus Megapalpis Halbert, 1944
description: Published as part of Pešić, Vladimir & Smit, Harry, 2014, Torrenticolid water mites (Acari: Hydrachnidia: Torrenticolidae) from Malaysian Borneo, pp. 1-72 in Zootaxa 3840 (1) on pages 25-26, DOI: 10.11646/zootaxa.3840.1.1, http://zenodo.org/record/4927892