Teredorus combfemorus Zha & Hyde

Zha, Ling-Sheng, Wen, Ting-Chi, Kang, Ji-Chuan & Hyde, Kevin D., 2016, Records of Hedotettix and Teredorus in Thailand with the description of three new species (Orthoptera, Tetrigidae), ZooKeys 556, pp. 83-95 : 90-93

Taxon classification Animalia Orthoptera Tetrigidae

Teredorus combfemorus Zha & Hyde sp. n. Figs 5, 6

Diagnosis.

Teredorus combfemorus sp. n. is similar to Teredorus choui Zheng, Ou & Lin, 2012, the former differs from the latter mainly by: 1) lateral ocellus situated on a quarter of lower inner margin of eye (Fig. 6A); 2) apex of posterior angle of lateral lobe of pronotum nearly truncate (Fig. 5A, C), not rounded; 3) lower margins of fore and mid femora comb-shaped (Fig. 6F, G); 4) upper valvulae of female 3.0 times as long as wide (Fig. 6E) (also see in Table 1).

Description.

Female. Body size small and slender, length of body (from vertex to apex of hind process) 3.5 times its width (between posterior angles of lateral lobes of pronotum) (Fig. 5B).

Head. Head distinctly protruding over level of pronotum; in dorsal view, vertex strongly contracted forward and two eyes nearly connected with each other on anterior margin of vertex, vertex not protruding beyond anterior margins of eyes; lateral margins folded upward and up to the same height as anterior median carina; median carina conspicuous and protruding in anterior half, while obscure in posterior half (Fig. 6D); vertex a little visible before eyes in lateral view, vertex together frontal ridge forming right angled, frontal ridge straight and not concave between lateral ocelli, slightly arc-protruding between antennae (Fig. 6C), longitudinal furrow nearly as wide as first segment of antenna; antenna filiform, 15-segmented, inserted below lower margins of eyes (Fig. 6A), mid segment 5-6 times as long as wide; eyes globose, erected above level of pronotal surface, lateral ocellus situated on a quarter of lower inner margin of eye (Fig. 6A, C).

Thorax. Disc of pronotum smooth, with numerous small granules, midkeel of pronotum complete; upper margin of pronotum with a very small protrusion before shoulders, in profile upper margin of pronotum slightly undulate (nearly straight) before shoulders and straight behind shoulders (Fig. 5 A–C); anterior margin of pronotum truncate, lateral keels of prozona conspicuous and parallel, about 0.5 times as long as the width between them (Fig. 6D); humeral angle obtusely angled, abbreviated carinae absent between shoulders; hind process of pronotum narrow, long cone-shaped, reaching three quarters of hind tibia (length of distal part which surpass beyond apex of hind femur 3.3 mm, pronotum about 3.5 times as long as the distal part) (Fig. 5B); posterior angle of lateral lobe of pronotum extending downwards, apex nearly truncate, posterior margin of each lateral lobe with two concavities; visible part of tegmina ovate, apex narrowly rounded, 2.8 times as long as wide (Fig. 5A, C); hind wings developed, reaching or slightly surpassing beyond apex of hind process of pronotum; fore and mid femora flat, upper margins of all femora and lower margins of hind femora finely dentate, sawteeth of lower margins of fore and mid femora elongate, forming comb-shaped; upper margin of fore femur slightly arcuate, distal part of lower margin incomplete; upper margin of mid femur nearly straight, lower margin slightly undulate (Fig. 6F, G); width of mid femur distinctly wider than visible part of tegmen; hind femur about 2.9 times as long as wide, antegenicular triangulate, genicular denticles fingered extending backward and apex quadrangular (Fig. 5A); outer side of hind tibia with 7-8 spines, inner side with 4-5 spines; first segment of posterior tarsus equal to third in length, three pulvilli nearly equal in length, apices of all pulvilli obtuse.

Abdomen. Ovipositor: upper valvulae about 3.0 times as long as wide, outer margins of upper and lower valvulae with small saw-like teeth (Fig. 6E); posterior margin of subgenital plate truncate and in the middle triangularly protruding which is folded inward (Fig. 6B).

Coloration. Body gray. Antenna brown, color of distal segments darker; hind wings black; all femora with the same color as body; lower outer side and inner side of hind femur partially dark brown; all tibiae yellowish brown, with three black bands (the distal band longest) respectively.

Male.

Unknown.

Measurements.

Length of body (from vertex to apex of abdomen) ♀8.5-9.0 mm; length of pronotum ♀11.5-12.0 mm; length of hind femur ♀5.5-6.0 mm.

Type material.

Holotype female (Nos. 15-0633, MFLU), Thailand, Chiang Rai, Fathai, N20°2'58", E99°52'43", 425.5 m alt, 10 Dec. 2014, collected by Ling-Sheng ZHA. Paratypes: 2 females (HNU), same data as holotype.

Biology and ecology.

Teredorus combfemorus Zha & Hyde, sp. n. inhabits stony place on border of a stream in tropical region. From collecting time we infer they overwinter as adults.

Etymology.

This new species’ name is derived from the Latin comb and femora, which means lower margins of fore and mid femora comb-shaped.

Distribution.

Thailand (Chiang Rai).