Teredorus Hancock

Ding, Jian-Hua, Wen, Ting-Chi, Wu, Xiao-Min, Boonmee, Saranyaphat, Eungwanichayapant, Prapassorn D. & Zha, Ling-Sheng, 2017, Species diversity of Tetrigidae (Orthoptera) in Guizhou, China with description of two new species, Journal of Natural History (J. Nat. Hist.) 51 (13 - 14), pp. 741-760 : 753-757

Teredorus Hancock

60. Teredorus guizhouensis Zheng *

In: Shiqian ( Zheng 2005)

61. Teredorus jinshaensis Zha & Ding sp. nov. *

( Figures 8 (a–c) and 9(a–e))

Female. Size small and slender. Body length (from vertex to apex of hind process) 3.25 times body width (between two posterior angles of lateral lobes of pronotum) ( Figure 8 ). Vertex exserted over level of pronotal disc, in dorsal view strongly contracted forward, not reaching anterior margin of eyes; between anterior margin of eyes very narrow; anterior part of lateral margin folded upward, up to top of eyes and slightly higher than anterior part of medial carina; medial carina in anterior half conspicuous and a little surpassing anterior margin of eyes, but in posterior half obscure; face slightly oblique, in lateral view vertex together with frontal costa nearly right-angled, which is visible before eyes, frontal ridge straight between lateral ocelli, then a little arcuate forward between antennae; in frontal view longitudinal furrow gradually broadening downward, width between antennae equal to diameter of scapus. Antenna filiform and short, 17-segmented, inserted slightly below lower margin of eyes (upper margin of antennal grooves and lower margin of eyes at the same level), the longest segment (10th–12th) 4.5 times as long as wide. Eyes globose and exserted, distinctly over level of pronotal disc, lateral ocellus placed on lower one-third of inner margin of eye ( Figure 9 (a–c)).

Pronotal disc smooth, with numerous fine granules, median carina entire, in lateral view upper margin of pronotum straight; anterior margin of pronotum truncated, prozonal carinae conspicuous and nearly parallel (slightly contracted forward); humeral angle depressed, a little obtusely angled; paired interhumeral carinae presented between shoulders, long, oblique and obscure; hind process narrow, long coneshaped, apex truncated and upper margin of apex margined with some fine white hairs, surpassing apex of hind femur and reaching middle of hind tibia (length of distal part which surpasses apex of hind femur 2.2 mm, pronotum 5.2 times as long as the distal part); posterior angle of lateral lobe extending obliquely and backwards, apex subtruncate an anterior margin of apex rounded, posterior margin of each lateral lobe with two concavities. Visible part of tegmen long oval, apex narrowly rounded, 2.6 times as long as wide. Hind wings developed, reaching or slightly surpassing apex of hind process. Margins of all femora finely serrate but base of upper margin of hind femur smooth, upper and lower margins of fore and mid femora straight, rear of lower margin of fore femur has a concavity, mid femur little wider than visible part of tegmen. Hind femur 2.9 times as long as wide, antegenicular denticle long triangular and apex sharp, genicular denticle finger-like backward and apex obtuse; outer/inner side of hind tibia with 4–6/5–6 spines; first segment of hind tarsus as long as third, third pulvillus longer than first and second, apices of all pulvilli obtuse. Ovipositor: upper valva 3.0 times as long as wide, outer margins of upper and lower valvae with saw-like teeth. Subgenital plate: length shorter than width, posterior margin truncated and in the middle triangularly protruding which is folded inward ( Figure 9 (d)).

Body grey or greyish brown, face dark; antenna brown, colour of distal segments dark; wings black; lower outer side of hind femur black, inner side yellowish brown; all tibiae brown with yellowish brown rings, three small on fore and mid tibiae each, two large on hind tibia ( Figure 8 ).

Male. Distinctly smaller than female. Vertex exserted distinctly over level of pronotal disc; antenna 16-segmented, 9th–11th segments longest; hind process of pronotum reaching variably from one-third to middle of hind tibia (distal part 1.5–1.8 mm, pronotum 5.2–5.6 times as long as the distal part), apex of hind process without fine white hairs. Subgenital plate abbreviated and cone-shaped, posterior margin truncated and apex notched ( Figure 9 (e)). Other characters same as female ( Figure 8 ).

Measurements. Length of body (mm): ♂ 6.8–7.2, ♀ 9.1–9.5; length of pronotum: ♂ 8.3– 9.4, ♀ 11.4–11.6; length of hind femur: ♂ 4.7–4.9, ♀ 5.9–6.1.

Type material. Holotype: ♀, China, Guizhou, Jinsha County, Lengshuihe Natural Reserve ( Figure 1 ), 27.9 N, 106.0 E, 650 m altitude, 7 August 2015, collected by Lingsheng Zha. Paratypes: 2♂ 1♀, same data as holotype.

Diagnosis. Teredorus jinshaensis sp. nov. is similar to T. prominemarginis Zheng & Jiang ( Zheng and Jiang 1993) and Teredorus choui Zheng, Ou & Lin ( Zheng et al. 2012), their main differences are shown in Table 2.

Etymology. This new species is named after Jinsha County, its type locality.

shaensis sp. nov.

Distribution. China (Guizhou), only found in a stream of Lengshuihe Natural Reserve, Jinsha County ( Figure 1 ).

Ecology and habits. Individuals of Teredorus jinshaensis sp. nov. inhabit stony places on the edge of a stream ( Figure 10 ). They move quickly under the sun. They feed on all sorts of humus. They live together with Thoradonta varispina Zha & Sheng ( Zha et al. 2016a), and near their habitat, Bolivaritettix jinshaensis Zha & Wen ( Zha et al. 2015) had been found.

Investigation was made wholly in the Lengshuihe Natural Reserve for 1 week. The new species was only found alongside one stream, also the stream was being polluted. So we are afraid that the new species will become extinct in the very near future.

62. Teredorus xishuiensis Zheng, Li & Shi * In: Xishui ( Zheng et al. 2003b)

Figures

Figure 1. Geographical map of Guizhou Province, where localities of the described species in this study are showed.

Figure 8. Teredorus jinshaensis sp. nov.: (a, b) lateral and dorsal views of female body; (c) oblique view of male body. Scale bars = 1 mm.

Figure 9. Teredorus jinshaensis sp. nov.: (a) dorsal view of female head and anterior pronotum; (b) lateral view of female head and anterior pronotum; (c) frontal view of female head; (d) ventral view of female distal abdominal segments; (e) lateral view of male subgenital plate. Scale bars = 1 mm.

Figure 10. Habitat environment of Teredorus jinshaensis sp. nov. Pictures were photographed by Lingsheng Zha in Lengshuihe Natural Reserve, Jinsha County, Guizhou, China.