Formosatettix guposhanensis Deng, 2019

Wei, Shi-Zhen, Deng, Wei-An & Lu, Xiang-Yi, 2019, Pygmy grasshoppers of the genus Formosatettix Tinkhamı 1937 (Orthoptera: Tetrigidae: Tetriginae), Journal of Natural History 53 (17), pp. 1001-1022 : 1016-1019

Formosatettix guposhanensis Deng sp. nov.

( Figures 5 and 6 )

Description

Female (holotype). Size small, body robust and short. Fastigium of vertex in dorsal view distinctly surpassing the anterior margin of eyes, 2.0 times wider than width of one eye from above; anterior margin of fastigium arcuate, median carina of fastigium reaching the middle of eyes, without fossula and slight protruding between the lateral margin and median carina; frontal ridge and fastigium in lateral view form obtuse rounded angle, frontal ridge between fastigium and median ocellus straight. In frontal view, frontal carinae diverged above lateral ocelli, width of longitudinal furrow of frontal ridge distinctly wider than diameter (width) of antennal socket. Antennae filiform, located between lower third of inner margin of eyes, 14-segmented, mid segments 4 – 5 times as long as wide. Eyes globose; lateral ocelli placed in slightly above middle of inner margin of eye.

Pronotum compressed, its surface smooth and with dense small particles. In dorsal view, dorsum tectiform, anterior margin of pronotum slightly arcuate protruding; lateral carinae of prozona constricted backwards; the apex of pronotum sharp-rounded, not bilobate, surpassing knee of hind femur and almost reaching apex of hind femur. In profile, median carina of pronotum slightly arch-like before shoulders and straight behind shoulders; lower margin of hind process straight, lateral carinae of metazona also slightly straight, width of the area between the two is 0.5 mm. Posterior angles of lateral lobes turned downwards, apex of posterior angles obtuse rounded, posterior margins of lateral lobes of pronotum with only lower sinus. Tegmina and hind wings absent. Lower carinae of fore and mid femora slightly sinuate. Hind femur stout, 2.8 times as long as wide; upper carinae slightly finely serrated and lower carinae smooth; antegenicular and genicular denticles right angled. Outer side of hind tibia with 8 – 10 spines, inner side with 6 – 7 spines. Length of first segment of hind tarsi 2.0 times longer than third, three pulvilli equal in length, apices of all pulvilli obtuse. Ovipositor stubby, length of upper valvulae 3.2 times its width, upper and lower valvulae with slender sawlike teeth. Length of subgenital plate nearly equal to its width, posterior margin of subgenital plate with three teeth, middle tooth longer than side teeth.

Body yellowish brown or dark brown; antennae brown, end segments black. Fore and mid femora and tibiae brownish. Hind femur dark brown, middle side of outer part with a pale linear zone. Hind tibia dark brown, the base brown. Dorsal side of upper valvulae of ovipositor and ventral side of lower valvulae of ovipositor black.

Male. Unknown.

Measurements (mm). Length of body ♀ 13.0 – 13.5; length of pronotum ♀ 10.5 – 10.8; length of hind femur ♀ 7.0 – 7.5.

Type material. Holotype: 1♀, 21 August 2017, collected by Wei-An DENG, EMHU . Paratypes: 3♀, same data, type locality, EMHU.

Type locality. China, Guangxi prov., Hezhou (Guposhan), 24.619°N, 111.541°E, 900m alt .

Diagnosis

The new species is similar to Formosatettix karenkoensis Tinkham, 1937 from which it differs in anterior margin of vertex arcuate (anterior margin of vertex straight in F. karenkoensis ); vertex without fossula and slight protruding between the lateral margin and median carina (vertex with fossula and slightly concave between the lateral margin and median carina in F. karenkoensis ); in lateral view frontal ridge between fastigium of vertex and median ocellus straight (frontal ridge in lateral view concave before eyes in F. karenkoensis ); antennae located between lower third of inner margins of eyes (antennae located between lower margins of eyes in F. karenkoensis ); in profile, median carina of pronotum slightly arch-like before shoulders and straight behind shoulders (in profile, median carina of pronotum straight in F. karenkoensis ).

Etymology. The new species was named after the type locality, Guposhan, Guangxi, China.

Distribution. China (Guangxi).

Figures

Figure 5. Formosatettix guposhanensis Deng sp. nov., holotype female. (a) body, lateral view; (b) the same, dorsal view; (c) head and anterior part of pronotum, dorsal view; (d) the same, lateral view; (e) head, frontal view. Scale bars: 1 mm.

Figure 6. Formosatettix guposhanensis Deng sp. nov. holotype female. (a) antenna, lateral view; (b) left fore femur, lateral view; (c) left mid femur, lateral view; (d) left hind tibia, lateral view; (e) left posterior tarsus, lateral view; (f) subgenital plate, ventral view. Scale bars: 1 mm.