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

Atractides (Atractides) sabahensis n. sp.

( Figs. 14A–D , 15A–D )

Type series. Holotype male, dissected and slide mounted, Mahua stream at crossing with main road, Crocker Range, Borneo, Malaysia, 5º 45.225 N 116º 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, 5º 46.491 N 116º 25.770 E, alt. 865 m asl., 22-ix-2012 ( RMNH).

Diagnosis. Palp without sexual dimorphism, ventral margin P2 convex, P3 weakly concave proximally, distally convexly protruding, P4 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. 14C–D ): Ventral margin of P2 convex, P3 proximally weakly concave, distally convex, P4 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. 14B , 15A ). 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. 15D ).

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 P2/P4 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. 11E and 14C–D ), and by a shorter and more stout I-L-6 ( Fig. 11F ).

Malformation. I-leg of one female shows particular deformation (lacking sword setae S-1 and -2— Fig. 15B ).

Distribution. Borneo.

Figures

FIGURE 14 A – D. Atractides sabahensis n. sp., Mahua stream, male holotype: A = idiosoma, ventral view; B = I-leg- 5 and - 6; C = palp, medial view; D = palp, lateral view. Scale bars = 100 Μm.

FIGURE 15 A – D. Atractides sabahensis n. sp., Mahua stream, female paratype: A – B = I-leg- 5 and - 6; C = palp, medial view; D = genital field. Scale bar = 100 Μm.

FIGURE 11 A – F. A – D Atractides cognatus (K. Viets, 1935), Mahua stream (A – C male, D female): A = genital field; B = I-leg- 5 and - 6; C = palp, lateral view; D = genital and postgenital field. E – F Atractides propatulus (K. Viets, 1935), Mahua stream, male: E = palp, lateral view; F = I-leg- 5 and - 6. Scale bars = 100 Μm.