Torrenticola schilthuizeni, Pešić & Smit, 2014

Pešić, Vladimir & Smit, Harry, 2014, Torrenticolid water mites (Acari: Hydrachnidia: Torrenticolidae) from Malaysian Borneo, Zootaxa 3840 (1), pp. 1-72: 25-26

publication ID

http://dx.doi.org/10.11646/zootaxa.3840.1.1

publication LSID

lsid:zoobank.org:pub:CDF827EB-8A66-438F-AC5C-07A7D3D83BB9

DOI

http://doi.org/10.5281/zenodo.5110178

persistent identifier

http://treatment.plazi.org/id/F535879E-7E7C-FFD8-FF0D-FDEBD734F9E8

treatment provided by

Felipe

scientific name

Torrenticola schilthuizeni
status

n. sp.

Torrenticola schilthuizeni   n. sp.

( Figs. 15A–D View FIGURE 15 , 16F View FIGURE 16 , 17F View FIGURE 17 )

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. GoogleMaps  

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 View FIGURE 15 ); 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 View FIGURE 15 ).

Measurements —Idiosoma (ventral view: Figs. 15B View FIGURE 15 , 17F View FIGURE 17 ) L 578, W 434; dorsal shield ( Figs. 15A View FIGURE 15 , 16F View FIGURE 16 ) 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; P4, 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 View FIGURE 43 ).

Distribution. Borneo; known only from the locus typicus.

Subgenus Megapalpis Halbert, 1944