Teredorus chiangraiensis 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 : 87-90

Taxon classification Animalia Orthoptera Tetrigidae

Teredorus chiangraiensis Zha & Hyde sp. n. Figs 3, 4

Diagnosis.

Teredorus chiangraiensis sp. n. is similar to Teredorus combfemorus sp. n., the former differs from the latter mainly by: 1) lateral keels of prozona slightly shorter than width between them (Fig. 4A), while only 0.5 time occurs in the later (Fig. 6D); 2) hind process of pronotum short, never reaching two thirds of hind tibia (Fig. 3A, C); 3) lower margins of fore and mid femora normal, not comb-shaped; 4) lower outer side of hind femur distinctly black (Fig. 3A, C) (also see in Table 1).

Description.

Female. Body size small and slender, length of body (from vertex to apex of hind process) about 3.3 times its width (between posterior angles of lateral lobes of pronotum) (Fig. 3B).

Head. Head distinctly protruding over level of pronotal surface (Fig. 4D); in dorsal view, vertex strongly contracted forward, 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 same height as anterior part of median carina; median carina conspicuous and protruding in anterior half, while obscure in posterior half (Fig. 4A); vertex a little visible before eyes in lateral view, vertex together with frontal ridge right angled, frontal ridge straight and not concave between lateral ocelli, slightly arc-protruding between antennae (Fig. 4D), longitudinal furrow narrower than first segment of antenna in width; antenna filiform, 16-segmented, inserted below lower margin of eyes (Fig. 4B), mid segment 5-6 times as long as wide; eyes globose, erected above level of pronotal surface, lateral ocellus situated on one fifth of lower inner margin of eye (Fig. 4B, D).

Thorax. Disc of pronotum smooth, with numerous small granules, midkeel of pronotum complete; in profile upper margin of pronotum straight, only a little protruding before shoulders (Fig. 3A, B); anterior margin of pronotum truncate, lateral keels of prozona conspicuous and parallel (Fig. 4A), humeral angle obtusely angled, abbreviated carinae absent between shoulders; hind process of pronotum narrow, long cone-shaped, surpassing beyond apex of hind femur and not reaching or slightly surpassing beyond middle of hind tibia (length of distal part which surpass beyond apex of hind femur variable between 1.5 and 2.5 mm, pronotum 4.0-5.7 times as long as the distal part) (Fig. 3B); 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; hind wings developed, reaching or slightly surpassing beyond apex of hind process of pronotum (Fig. 3A, B); upper and lower margins of all femora finely dentate; upper margin of fore femur slightly arcuate, distal part of lower margin slightly concave; upper margin of mid femur nearly straight, lower margin slightly undulate; mid femur slightly wider than visible part of tegmen; hind femur about 3.1 times as long as wide, antegenicular triangulate, genicular denticles fingered extending backward and apex triangulate; outer side of hind tibia with 6-7 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 valvula about 3.0 times as long as wide, outer margins of upper and lower valvulae with small saw-like teeth (Fig. 4E); posterior margin of subgenital plate truncate and in the middle triangularly protruding which is folded inward (Fig. 4C).

Coloration. Body dark brown. Antenna brown, colour of distal segments deep; hind wings black; all femora with the same color as body; lower outer side of hind femur black, inner side of hind femur yellowish brown; all tibiae yellowish brown, with 3 black bands respectively (basal band small while middle and distal bands big).

Male.

Slightly smaller than female (Fig. 3C). Antenna 15-segmented Hind femur slightly stubby, about 2.8 times as long as wide; subgenital plate briefly cone-shaped, apex notched and not bidentate. Other characters same as female.

Measurements.

Length of body (from vertex to apex of abdomen) ♂6.5-7.0 mm, ♀8.0-8.5 mm; length of pronotum ♂8.5-10.0 mm, ♀9.3-10.0 mm; length of hind femur ♂4.7-5.0 mm, ♀5.2-5.5 mm.

Type material.

Holotype female (Nos. 15-0629, MFLU), Thailand, Chiang Rai, N20°19'43", E 99°51'49", 404.4 m alt, 25 Nov. 2014, collected by Ling-Sheng ZHA. Paratypes: 2 males and 1 female (Nos. 15-0630, 15-0631, 15-0632, MFLU), 3 males and 2 females (HNU), same data as holotype.

Biology and ecology.

Teredorus chiangraiensis 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 is named after Chiang Rai, its type locality.

Distribution.

Thailand (Chiang Rai).