Atractides curtisetus, 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: 32-33

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Atractides curtisetus

n. sp.

Atractides curtisetus  n. sp.

( Figs. 18 A –GView FIGURE 18 A – G)

Type series. Holotype female, dissected and slide mounted, Little Lumotok stream, Sayap, Mt Kinabalu, Borneo, Malaysia, 6 º 0 9.467 N 116 º 34.027 E, alt. 1069 m asl., 17 -ix- 2012 ( RMNH).

Diagnosis (Male unknown). Median sutures Cx-I short, posteromedial margin Cx-I+II rounded, P 4 sword seta and ventral setae inserted far distally; I-leg little modified, setae S- 1 and - 2 homoiomorphic and short, enlarged in basal third, side by side, flagellar seta short and weakly modified, I-leg- 6 nearly straight.

Description. Female. Integument dorsally striated, muscle insertions unsclerotized. Coxal field: Cx-I+II long and slender, posteromedial margin sharply rounded, Cx-II apodemes in an acute angle, Cx-III+IV slender, suture line Cx-III/IV in medial part nearly straight ( Fig. 18 AView FIGURE 18 A – G). Genital field: Ac in a curved line. Palp: ventral margin of P- 2 in the centre concave, slightly convex in the distal half, without extensions, P- 3 slightly concave, P- 4 nearly straight, sword seta and ventral setae inserted far distally ( Fig. 18 DView FIGURE 18 A – G). Legs: I-leg little modified, I-leg- 5 with little diverging, straight dorsal and ventral margins, setae S- 1 and - 2 homoiomorphic and short, enlarged in basal third, side by side, flagellar seta short and weakly modified, I-leg- 6 nearly straight, dorsal and ventral margins equally diverging from the base to the claw furrow, but with the typical setae groups, claw strong ( Fig. 18 BView FIGURE 18 A – G).

Measurements —Idiosoma length/width 628 / 446; coxal field: length 375; Cx-III width 400; Cx-I+II medial length 182, lateral length 273; genital field length/width 133 / 141, genital plates length 100–105; length Ac 1–3: 38 –40, 38–41, 38.

Palp: Total length 253, dorsal length/height, dorsal length/height ratio: P1, 28/ 27, 1.03; P2, 55/ 38.5, 1.44; P3, 70/ 34, 2.1; P4, 74/ 21.5, 3.44; P5, 26/ 14, 1.9; length P 2 /P 4 ratio 0.75. Capitulum length 134; chelicera total length 197, claw length 56, basal segment length 148, length basal segment/claw ratio 2.64.

Legs: I-leg- 5 dorsal length 112, ventral length 91, dorsal length/ventral length ratio 1.23, maximum height 32, dorsal length/maximum height 3.47, S- 1 length 34, length/width ratio 5.5, S- 2 length 32, length/width ratio 4.8, distance S- 1-2 0, length ratio S- 1 / 2 1.05; I-leg- 6 length 123, maximum height (HC sensu Gerecke 2003) 31, length/ central height ratio 4.0; length I-leg- 5 / 6 ratio 0.91.

Male: unknown.

Etymology. Named for the short sword seta of I-leg- 5.

Remarks. The new species is unique among Oriental representatives of the genus in the combination of P- 4 sword and ventral setae placed far distally and a slightly modified I-leg, with terminal segments at first view appearing equal in shape to II/III-leg. Due to the unbowed terminal segment of I-leg the new species is similar to members of the subgenus Megabates K. Viets. However  , as mentioned by Gerecke (2003), the latter character is described in many Atractides  s. str. species, suggesting that most probably Megabates  is a synonym of Atractides  . Atractides (Megabates) orientalis ( Cook, 1967)  differs in having short and stocky palp segments, with P- 4 ventral setae inserted more proximally, capitulum with elongated and pointed rostrum, chelicerae with a long claw and a more stouter I-leg- 5 and - 6 (see Cook 1967).

Atractides chelidon Gerecke 2003  , a hyporheobiontic species, has a similar morphology of palp and I-L, but differs in the absence of lateral eyes, short median sutures Cx-I, and setae S- 1 and - 2 slender and more pointed (see Gerecke 2003).

Distribution. Borneo; known only from the locus typicus.


National Museum of Natural History, Naturalis