Atractides (Atractides) sabahensis, Smit, Harry & Pešić, Vladimir, 2014

Smit, Harry & Pešić, Vladimir, 2014, Water mites from Mount Kinabalu and the Crocker Range, Borneo, Malaysia (Acari: Hydrachnidia), with the description of 34 new species, Zootaxa 3876 (1), pp. 1-71: 28-29

publication ID

http://dx.doi.org/10.11646/zootaxa.3876.1.1

publication LSID

lsid:zoobank.org:pub:071AFC59-C2EA-429A-8511-BAC5C4539C04

persistent identifier

http://treatment.plazi.org/id/03D48784-A930-FFAA-FF35-1378FE45FC77

treatment provided by

Plazi

scientific name

Atractides (Atractides) sabahensis
status

n. sp.

Atractides (Atractides) sabahensis  n. sp.

( Figs. 14 A –DView FIGURE 14 A – D, 15 A –DView FIGURE 15 A – D)

Type series. Holotype male, dissected and slide mounted, Mahua stream at crossing with main road, Crocker  Range, Borneo, Malaysia, 5 º 45.225 N 116 º 26.085 E, alt. 752 m asl., 22 -ix- 2012 ( RMNH). Paratypes: 1 / 5 (1 juvenile)/0, same data as holotype, one female dissected and slide mounted; 1 / 6 /0, Mahua stream, downstream of national park entrance, Crocker  Range, Borneo, Malaysia, 5 º 46.491 N 116 º 25.770 E, alt. 865 m asl., 22 -ix- 2012 ( RMNH).

Diagnosis. Palp without sexual dimorphism, ventral margin P 2 convex, P 3 weakly concave proximally, distally convexly protruding, P 4 elevated near insertion of proximoventral seta; S- 1 and - 2 close to each other, S- 2 thicker than S- 1, I-L- 6 curved and relatively long (length ratio I-leg- 5 / 6 1.35-1.4).

Description. Integument dorsally striated, muscle insertions unsclerotized. Genital field: Ac in an obtuse triangle. Excretory pore smooth; vgl- 1 separate from vgl- 2. Palp ( Figs. 14 C –DView FIGURE 14 A – D): Ventral margin of P 2 convex, P 3 proximally weakly concave, distally convex, P 4 elevated near insertion of proximoventral seta, sword seta between ventral setae. Legs: I-leg- 5 distally protruding near insertion S- 1, S- 1 and - 2 close to each other, S- 2 thicker than S- 1, I-leg- 6 curved, inflated proximally, from the centre to the claw furrow with parallel dorsal and ventral margins ( Figs. 14 BView FIGURE 14 A – D, 15 AView FIGURE 15 A – D). Male: Genital field anterior margin slightly convex, posterior margin indented. Female: Genital field: genital plates slender, Ac- 3 smaller than Ac- 1 and - 3 ( Fig. 15 DView FIGURE 15 A – D).

Measurements. Male (holotype)—Idiosoma length/width 416 / 316; coxal field: length 256; Cx-III width 272; Cx-I+II medial length 103, lateral length 172; genital field length/width 77 / 91, length Ac 1–3: 23 –27, 30–34, 29; ejaculatory complex length 76.

Palp: Total length 225, dorsal length/height, dorsal length/height ratio: P1, 22/ 20, 1.1; P2, 49/ 37, 1.3; P3, 54/ 34, 1.59; P4, 71/ 20, 3.55; P5, 29/ 11.5 / 2.55; length P 2 /P 4 ratio 0.68; capitulum ventral length 105; chelicera total length 139.

Legs: I-leg- 5 dorsal length 129, ventral length 85, dorsal length/ventral length ratio 1.51, maximum height 43, dorsal length/maximum height 3.0, S- 1 length 72, length/width ratio 10.0, S- 2 length 60, length/width ratio 5.1, distance S- 1-2 11, length ratio S- 1 / 2 1.2; I-leg- 6 length 96, central height 17, length/central height ratio 5.5; length I-leg- 5 / 6 ratio 1.35.

Female (paratype)—Idiosoma length/width 644 / 525; coxal field: length 300; Cx-III width 394; Cx-I+II medial length 117, lateral length 202; genital field length/width 140 / 146, genital plates length 100, length Ac 1–3: 35 –36, 35–39, 29– 32.

Palp: Total length 277, dorsal length/height, dorsal length/height ratio: P1, 25/ 25, 1.0; P2, 57/ 40, 1.43; P3, 72/ 33, 2.18; P4, 89/ 21.5, 4.1; P5, 34/ 14, 2.4; length P- 2 /P- 4 ratio 0.64; capitulum ventral length 109; chelicera total length 169.

Legs: I-leg- 5 dorsal length 175, ventral length 116, dorsal length/ventral length ratio 1.51, maximum height 52, dorsal length/maximum height 3.4, S- 1 length 97, length/width ratio 9.0, S- 2 length 78, length/width ratio 5.2, distance S- 1-2 18, length ratio S- 1 / 2 1.24; I-L- 6 length 128, central height 18.5, length/central height ratio 6.9; length I-L- 5 / 6 ratio 1.37.

Etymology. Named after the province (Sabah) where the new species was found.

Remarks. The new species closely resembles Atractides propatulus ( K. Viets, 1935)  (South Sumatra, K. Viets 1935) in the small S- 1 / 2 interspace, I-leg- 6 curved and stocky, and a palp without sexual dimorphism. The latter species can be distinguished by more slender palp segments, with almost straight ventral margins of P- 2–4 (compare Figs. 11 EView FIGURE 11 A – F. A – D and 14 C –DView FIGURE 14 A – D), and by a shorter and more stout I-L- 6 ( Fig. 11 FView FIGURE 11 A – F. A – D).

Malformation. I-leg of one female shows particular deformation (lacking sword setae S- 1 and - 2 — Fig. 15 BView FIGURE 15 A – D).

Distribution. Borneo.

RMNH

National Museum of Natural History, Naturalis