Macromotettix zhengi Deng, 2021

Lu, Xiang-Yi & Deng, Wei-An, 2021, New genus and new species of the subfamilyMetrodorinae from China (Orthoptera Tetrigidae), Zootaxa 4964 (2), pp. 345-362 : 355-357

Macromotettix zhengi Deng , sp. nov.

( Figures. 5–6 )

Type material. Holotype: female, P. R. China: Guangxi: Fangcheng (Dongzhong), 21°38’46.98” N, 107°31’10.14” E, 600m, 09 August 2012, collected by Liliang LIN ( EMHU) . Paratypes: 2♂ 2♀, same data, type locality, collected by Liliang LIN and Minping LIN ( EMHU) .

Description. Female. Small in size, short, body surface interspersed with granules and sparse small protuberances.

Head. Head a little exserted above pronotal surface. Fastigium of vertex short; in dorsal view, width of vertex between eyes 1.2 times width of compound eye; anterior margin of fastigium arched, not surpassing anterior margin of eye; median carina visible anteriorly; lateral margins slightly turned backward. In lateral view, frontal ridge and vertex forming a rounded shape, frontal costa concave between eyes, protruded anteriorly and broadly rounded between antennal grooves. In frontal view, frontal costa bifurcated above lateral ocelli, longitudinal furrow narrowly divergent between antennae, width of longitudinal furrow of frontal ridge narrower than antennal groove diameter. Antennae filiform, antennal grooves inserted between or slightly below inferior margin of compound eyes, 15- segmented, the 10th and 11th segment are the longest, about 4-5 times longer than its width. Eyes globose, lateral (paired) ocelli placed in middle of anterior margins of compound eye.

Thorax. Pronotal disc interspersed with dense granules and sparse coarse tubercles. Pronotum with a truncate anterior margin, median carina entire; upper margin of pronotum in profile straight; lateral carinae of prozona parallel; humeral angle arched, lateral carinae of pronotum slightly constricted backward after shoulders; with interhumeral carina; hind pronotal process narrow and bended downwards, its apex sharply, nearly reaching apex of hind femur. Humeral apex ridge and lower margin of pronotum connected behind middle of lower margin of pronotum. Posterior angles of lateral lobes produced outwards, end of posterior angles truncate, posterior margin of each lateral lobe of pronotum with ventral sinus and tegminal (upper) sinus. Tegmina very small, apex sharply rounded. Hind wings are shortened and reaching about the middle of hind femora.

Legs. Fore femora and middle femora with undulated upper and ventral margins, width of midfemur 2.8 times width of visible part of tegmina. Hind femora robust and short, 2.8 times as long as wide, upper and ventral margins finely serrated, antegenicular denticles right angle and genicular denticles acute. Outer side of hind tibia with 6–7 spines, inner side with 4–5 spines. Length of first segment of posterior tarsi longer than third, three pulvilli of first segment of posterior tarsi are increased in turn, all apices obtuse.

Abdomen. Ovipositor narrow and long, length of upper valvulae 4.0 times its width, upper and lower valvulae with slender saw-like teeth. Length of subgenital plate longer than its width, middle of posterior margin of subgenital plate triangular projecting.

Coloration. Body dark brown; frons, sternum of thorax and abdomen, tegmina and hind wings black. Fore and middle femora and tibia brown, with two dark brown rings. Outer part lower side of hind femur black. Hind tibia black, its base and middle brown.

Male. Similar to female, but smaller and narrower. Subgenital plate short, cone-shaped, apex bifurcated.

Measurements (mm). Length of body: ♂ 7.0–7.5, ♀ 10.0–10.5; length of pronotum: ♂ 7.0–7.5, ♀ 8.0–8.5; length of hind femur: ♂ 4.0–4.5, ♀ 5.0–5.5.

Diagnosis. New species is similar to Macromotettix tianlinensis Liang & Jiang, 2004 from which it differs in frontal ridge and vertex forming a rounded shape (frontal ridge and vertex forming a right angle in M. tianlinensis ); hind pronotal process bended downwards (hind pronotal process straight in M. tianlinensis ); pronotum with interhumeral carina (pronotum without interhumeral carina in M. tianlinensis ); fore femora and middle femora with undulated ventral margins (fore femora and middle femora with straight ventral margins in M. tianlinensis ). It appears similar also to Macromotettix brachyptera Deng , sp. nov., but differs from the latter by width of vertex between eyes 1.2 times width of compound eye (width of vertex between eyes 0.7 times width of compound eye in M. brachyptera ); frontal ridge and vertex forming a rounded shape (frontal ridge and vertex forming a right angle in M. brachyptera ); upper margin of pronotum in profile straight (upper margin of pronotum in profile undulate in M. brachyptera ); pronotum with interhumeral carina (pronotum without interhumeral carina in M. brachyptera ).

Etymology. The new species is named after the famous orthopterologist Zhemin Zheng.

Distribution. P. R. China: Guangxi.

Note. Macromotettix zhengi Deng was proposed in DENG’s (2016) PhD Dissertation, which has not been published according to the criteria of availability (ICZN 1999: Art. 8.1). The name Macromotettix zhengi Deng is made available in this paper.

Figures

FIGURE 5A–K. Macromotettix zhengi Deng, sp. nov., female, Holotype: A—body in dorsal view; B—body in lateral view; C—head in dorsal view; D—head in lateral view; E—head in frontal view; F—left fore femur in lateral view; G—left mid femur in lateral view; H—left hind femur in lateral view; I—left hind tibia in dorsal view; J—left posterior tarsi in lateral view. (scale bar = 1 mm).

FIGURE 6A–B. Macromotettix zhengi Deng, sp. nov., male, paratype:A—body in dorsal view; B—body in lateral view; (scale bar = 1 mm).