Neoatractides uniscutatus, Pešić & Smit, 2014

Pešić, Vladimir & Smit, Harry, 2014, Torrenticolid water mites (Acari: Hydrachnidia: Torrenticolidae) from Malaysian Borneo, Zootaxa 3840 (1), pp. 1-72: 32

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Neoatractides uniscutatus

n. sp.

Neoatractides uniscutatus   n. sp.

( Figs. 20A–F View FIGURE 20 , 22C–D View FIGURE 22 , 23G View FIGURE 23 )

Type series. Holotype male, dissected and slide mounted, Malaysia, Borneo , unnamed stream Bansadon Trail , Inobong, Crocker Range, 5º51.456 N, 116º68.403 E, 18.ix.2012 Smit.  

Diagnosis (Female unknown). Frontal and shoulder plates fused with the large dorsal plate, but suture lines well visible; excretory pore and Vgl-1 embedded in the area of primary sclerotization; gnathosomal rostrum broad and upturned, narrower than remainder of the gnathosoma; P-4 stout (dL/H ratio 2.0).


Male. General features —Frontal and shoulder plates fused with the large dorsal plate, but suture lines well visible ( Figs. 20A View FIGURE 20 , 22C View FIGURE 22 ); Cxgl–4 posterior to Cxgl–2; medial suture line of Cx-II+III moderately long; suture line of Cx-IV in medial part directed posteriorly, laterally curved; genital field subrectangular in shape; ejaculatory complex as photographed in Figure 23G View FIGURE 23 ; excretory pore and Vgl–2 embedded in the area of primary sclerotization; P-1 with dorsal seta, P-2 and -3 without ventral projections, P-2 long with relatively short and slender ventral seta, lateral distal margin of P-3 deeply indented, P-4 stout, longer than P-3, dorsal margin strongly bowed, ventral margin concave with one long and one shorter seta ( Figs. 20C–D View FIGURE 20 ). Gnathosoma without conspicuous oral papillae and short posterodorsal projections, rostrum broad and upturned, narrower than remainder of the gnathosoma ( Fig. 20E View FIGURE 20 ); chelicera long with relatively short cheliceral claw (L basal segment/claw ratio 4.4). Legs: I-L with I-L-6 stout, L/H ratio 2.0, ventral margin distally strongly protruding ( Fig. 20F View FIGURE 20 ).

Measurements —Idiosoma (ventral view: Figs. 20B View FIGURE 20 , 22D View FIGURE 22 ) L 556, W 414; dorsal shield ( Figs. 20A View FIGURE 20 , 22C View FIGURE 22 ) L 455, W 328, L/W ratio 1.39. Gnathosomal bay L 131, Cx-I total L 259, Cx-I mL 128, Cx-II+III mL 106; ratio Cx-I L/ Cx-II+III mL 2.4; Cx-I mL/Cx-II+III mL 1.2. Genital field L/W 93/70, ratio 1.32; distance genital field-excretory pore 78, genital field-caudal idiosoma margin 97. Gnathosoma vL 238–239; chelicera total L 263, basal segment L 220, claw L 50, L basal segment/claw ratio 4.4; palp total L 194–195, dL/H, dL/H ratio: P-1, 32/31–32, 1.03; P-2, 75/32, 2.36; P-3, 34/38, 0.9; P-4, 41–42/21, 2.0; P-5, 12/15, 0.8; P-2/P-4 ratio 1.82. Legs: dL of I-L-5–6: 85, 96, I- L-6 H 48, dL/H I-L-6 ratio 2.0.

Female: unknown.

Etymology. The species name refers to the undivided dorsal shield of the new species.

Discussion. Neoatractides uniscutatus   n. sp. is the third representative of the subgenus Heteratractides Lundblad, 1941   . Synapomorphies of the species included in this subgenus (i.e. subgeneric autapomorphies) include the following features: lateral distal margin of P-3 deeply indented and gnathosomal rostrum broad and upturned ( Wiles 1997). Two species are known so far, Neoatractides serratirostris ( Lundblad, 1941)   from Colombia ( Lundblad 1941) and N. orientalis Wiles, 1991   , described on the basis of two female specimens from Selangor, Peninsular Malaysia ( Wiles 1991, 1997). From the latter species, Neoatractides uniscutatus   n. sp. can be distinguished by the frontal platelets fused to the large dorsal plate. Neoatractides serratirostris   resembles the new species due to the anterolateral platelets fused with the large dorsal plate forming an undivided dorsal shield, but differs from the new species in having a shorter and broader gnathosomal rostrum, a very long ventral seta on P-2 exceeding the tip of P-5, a conventionally shaped ejaculatory complex, relatively larger genital field and a shorter medial suture line of Cx-II+III (see Lundblad 1953).

Habitat. Sandy/bouldery stream, shaded by rain forest ( Fig. 43B View FIGURE 43 ).

Distribution. Borneo; known only from the locus typicus.

Genus Pseudotorrenticola Walter, 1906