Formosatettix zheminzhengi Deng, 2023

Deng, Wei-An, Luo, Jie-Ling, Huang, Chao-Mei & Lin, Li-Liang, 2023, Review of the genus Formosatettix Tinkham (Orthoptera: Tetrigidae) with description of new taxa, new synonymy and an updated key to species, Zootaxa 5228 (3), pp. 201-243 : 235-236

16. Formosatettix zheminzhengi Deng , sp. nov. ( Figs. 22 , 23 , 24T , 25G )

Description. Female. Small size, short, body surface interspersed with net-like carinae and notches.

Head. Head and eyes not exserted above pronotal surface ( Fig. 22B ). Fastigium of vertex short; in dorsal view, width of vertex between eyes 1.4–1.5 times width of compound eye ( Fig. 22C ); anterior margin of fastigium straight, slightly surpassing anterior margin of eye; median carina visible anteriorly; lateral margins turned backward; vertex uneven with paired fossulae. In lateral view, frontal ridge and vertex forming an obtuse rounded shape; frontal costa straight or slightly concave between eyes ( Fig. 22D ), protruded anteriorly and broadly rounded between antennal grooves. In frontal view, frontal costa bifurcated above lateral ocelli, longitudinal furrow divergent between antennae, width of longitudinal furrow of frontal ridge 1.2 times antennal groove diameter ( Fig. 22E ). Antennae short, filiform, antennal grooves inserted between inferior margins of compound eyes, 15-segmented, the 10th and 11th segment are the longest, about 3 times longer than its width. Eyes globose, lateral (paired) ocelli located in middle of compound eye height.

Thorax. Pronotum distinctly tectiform, its surface coarse and postmedian of pronotum with net-like carinae and notches ( Fig. 22A ). In dorsal view, anterior margin of pronotum truncate; lateral carinae of prozona slightly constricted backwards; humeral angle absent; with a pair of interhumeral carinae; hind pronotal process narrow and long, almost reaching apex of hind femur and its apex narrowly rounded. In profile, median carina of pronotum slightly lamellate, straight or slightly arch-like; lower margin of hind process curved, external lateral carinae of metazona slightly curved, width of infrascapular area is 0.6 mm. Posterior angles of lateral lobes turned downwards, apex of posterior angles obtuse rounded, posterior margins of lateral lobes of pronotum only with ventral sinus and tegminal (upper) sinus absent. Tegmina and hind wings invisible (vestigial hidden under pronotum).

Legs. Fore and middle femora slightly compressed, margins finely serrated, with ventral margins slightly undulated ( Fig. 23A, B ). Hind femora robust and short, 2.8 times as long as wide; with carinated, margins finely serrated ( Fig. 23C ); antegenicular denticles and genicular denticles acute. Outer side of hind tibia with 7–8 spines, inner side with 5–6 spines ( Fig. 23D ). First segment of posterior tarsi longer than third, three pulvilli of first segment of posterior tarsi are increased in turn, apices of first and second acute, apices of third right angle ( Fig. 23E ).

Abdomen. Ovipositor narrow and long, length of upper valvulae 3.0 times its width, upper and lower valvulae with slender saw-like teeth. Length of subgenital plate nearly equal to its width, middle of posterior margin of subgenital plate triangular projecting ( Fig. 23F ).

Coloration. Body dark brown. Fore and middle legs dark brown or brown. Hind femur brown or dark brown. Hind tibia dark brown, with two light rings in the middle.

Male. Similar to female, but smaller and narrower ( Fig. 23G, H ). Width of vertex between eyes 1.7–1.8 times width of compound eye ( Fig. 23G ); width of infrascapular area is 0.7 mm. Subgenital plate short, cone-shaped, apex bifurcated.

Measurements (mm). Length of body: ♁ 7.0–7.5, ♀ 8.0–8.5; length of pronotum: ♁ 6.5–7.0, ♀ 7.0–7.5; length of hind femur: ♁ 4.5–5.0, ♀ 4.8–5.5.

Type material. Holotype: ♀, China, Guangxi prov., Jinxiu (Lianhuashan), 24°9ʹ8ʹʹ N, 110°6ʹ30ʹʹ E, 800 m alt., 02 October 2020, collected by Lei Xin, CLSGNU . Paratypes. 12♁, 13♀, same data, CLSGNU .

Diagnosis. This new species is similar to Formosatettix karenkoensis Tinkham, 1937 and Formosatettix gorkhanus Ingrisch, 2001 , but is easily distinguished by morphological characters as shown in Table 5 .

Etymology. The new species was named in memory of Professor Zhemin Zheng (1932–2021), a famous Chinese orthopterologist and a founder of Chinese tetrigides study.

Distribution. P. R. CHINA: Guangxi.

Figures

FIGURE 22. Formosatettix zheminzhengi Deng, sp. nov., holotype female. A—Body, dorsal view; B—The same, lateral view; C—Head and anterior part of pronotum, dorsal view; D—The same, lateral view; E—Head, frontal view.

FIGURE 23. Formosatettix zheminzhengi Deng, sp. nov., holotype female: A—Left fore femur, lateral view; B—Left mid femur, lateral view; C—Left hind femur, lateral view; D—Left hind tibia, lateral view; E—Left posterior tarsus, lateral view; F—Subgenital plate of female, ventral view; male, paratype: G—Body in dorsal view; H—Body in lateral view.

FIGURE 24. The type localities of new species and new synonyms in the genus Formosatettix. A—F. torulosinota; B—F. hainanensis; C—F. guangxiensis; D— F. cliva; E—F. guangyuanensis; F—F. huapingensis; G—F. nanlingensis andF.undulatifemura; H—F.guposhanensis; I—F.latifemurus; J—F.leigongshanensis;K—F. longwangshanensis; L—F.tianmushanensis; M—F.nyalamensis; N—F. serrifemora; O—F. wulongensis; P—F.shuimogouensis; Q—F.strictivertex; R—F. tangjiaheensis; S—F. yueqingensis; T—F. zheminzhengi.

FIGURE 25. Habitats of seven new species of the genus Formosatettix in China. A—F. cliva (Yunnan, Weixin, Daxueshan); B—F. guangyuanensis (Sichuan, Guangyuan, Qingchuan); C—F. shuimogouensis (Sichuan, Chaotian, Shuimogou); D—F. strictivertex (Xizang, Bomi, Pailong); E—F. tangjiaheensis (Sichuan, Qingchuan, Tangjiahe); F—F. yueqingensis (Zhejian, Yueqing, Yandangshan); G—F. zheminzhengi (Guangxi, Jinxiu, Lianhuashan).