Neoatractides sundaensis, Pešić & Smit, 2014

Pešić, Vladimir & Smit, Harry, 2014, Torrenticolid water mites (Acari: Hydrachnidia: Torrenticolidae) from Malaysian Borneo, Zootaxa 3840 (1), pp. 1-72: 28-32

publication ID

publication LSID


persistent identifier

treatment provided by


scientific name

Neoatractides sundaensis

n. sp.

Neoatractides sundaensis   n. sp.

( Figs. 19A–F View FIGURE 19 , 22A–B View FIGURE 22 )

Type series. Holotype female, dissected and slide mounted, Malaysia, Borneo , stream Kemantis , Sayap, Mt Kinabalu, 6º09.841 N, 116º33.936 E, alt. 928 m asl., 16.ix.2012 Smit. GoogleMaps  

Diagnosis (Male unknown). Shoulder platelets fused to the large dorsal plate; P-1 separate from P-2, P-2 and - 3 without ventral projections, P-2 with relatively long and slender seta in distal half of segment, dorsal margin proximally convexly protruding; P-3 with relatively long, hair-like ventral seta inserted in the proximal half of the segment; gnathosoma with long and slender rostrum, without conspicuous oral papillae


Female. General features —Shoulder platelets fused to the large dorsal plate ( Figs. 19B View FIGURE 19 , 22A View FIGURE 22 ); gnathosomal bay shallow; tips of Cx-I truncated; Cxgl-4 far posterior at margin of Cx-I/II, halfway between I-L and II-L insertions; genital field pentagonal in shape; suture line of Cx-IV distinct, extending posteriorly beyond posterior margin of genital field; excretory pore away from the line of primary sclerotization, Vgl-2 posterior from excretory pore; P-1 separate from P-2, P-2 and -3 without ventral projections, P-2 relatively long, ventral margin concave, with relatively long and slender seta inserted in distal half of the segment, dorsal margin proximally convexly protruding, ventral margin of P-3 slightly concave, with relatively long, hair-like seta inserted in proximal half of the segment ( Fig. 19E View FIGURE 19 ); gnathosoma with short posterodorsal projections, lacking conspicuous oral papillae, rostrum long and slender ( Fig. 19C View FIGURE 19 ); chelicera long with relatively short cheliceral claw (L basal segment/claw ratio 6.7). Legs: I-L ( Fig. 19F View FIGURE 19 ) with I-L-6 L/H ratio 2.8.

Measurements —Idiosoma (ventral view: Figs. 19A View FIGURE 19 , 22B View FIGURE 22 ) L 684, W 503; dorsal shield ( Figs. 19B View FIGURE 19 , 22A View FIGURE 22 ) L 596, W 447, L/W ratio 1.33; dorsal plate L 563; frontal plate L 139, W 44, L/W ratio 3.18. Gnathosomal bay L 63, Cx-I total L 245, Cx-I mL 182, Cx-II+III mL 47; ratio Cx-I L/Cx-II+III mL 5.2; Cx-I mL/Cx-II+III mL 3.9. Genital field L/W 152/133, ratio 1.14; distance genital field-excretory pore 153, genital field-caudal idiosoma margin 242. Gnathosoma vL 378; chelicera total L 406, basal segment L 377, claw L 56, L basal segment/claw ratio 6.7; palp total L 258, dL/H, dL/H ratio: P-1, 30/52, 0.57; P-2, 107/49-54, 2.0–2.2; P-3, 75/37, 2.04; P-4, 31/26, 1.19; P-5, 15/ 18.5, 0.79; P-2/P-4 ratio 3.43. Legs: dL of I-L-5–6: 88, 89; I-L-6 H 32, dL/H I-L-6 ratio 2.76.

Male: unknown.

Etymology. Named after Sunda Shelf; major landmasses on the shelf include the Malay Peninsula, Sumatra, Borneo, Java, Madura, Bali and their surrounding smaller islands.

Discussion. The subgenus Allotorrenticola   includes six species from Asia, i.e., Neoatractides abnormipalpis ( Lundblad, 1941)   ( Burma, Malaysia, Brunei; Wiles 1997), N. bahtilli ( Wiles, 1991)   ( Malaysia, Thailand; Wiles 1997, Pešić & Smit 2009a), N. malayensis ( Wiles, 1991)   ( Malaysia, Thailand; Wiles 1997, Pešić & Smit 2009a), N. suvarna ( Cook, 1967)   ( India, Cook 1967), N. farmerae Wiles, 1999   (Borneo, Wiles 1999) and N. calidus Pešić & Smit, 2012   (South Iran, Pešić et al. 2012a), and N. erato Pešić & Smit, 2014   (West Africa, Pešić & Smit 2014).

The shape of dorsal shield with the shoulder platelets fused to the large dorsal plate, makes the new species most similar to Neoatractides erato   , a species recently described from Ghana ( Pešić & Smit 2014). The latter species can easily be distinguished by the series of different character states: gnathosoma with conspicuous oral papillae (sensu Wiles 1997), P-2 maximum height at distal margin, P-3 stout with short ventral seta located in the distal half, P-4 almost equal in length with P-3, cheliceral claw relatively long, gnathosomal bay moderately deep (see Pešić & Smit 2014).

Two Allotorrenticola   species previously reported from Borneo ( Wiles 1999), N. abnormipalpis   and N. farmerae   can easily be distinguished from N. sundaensis   n. sp. in addition to the shoulder platelets not fused to the large dorsal plate, by P-1 partially fused with P-2 (see Wiles 1999).

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

Distribution. Borneo; known only from the locus typicus.

Subgenus Heteratractides Lundblad, 1941