Formosatettix yueqingensis 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 : 232-234

15. Formosatettix yueqingensis Deng , sp. nov. ( Figs. 20 , 21 , 24S , 25F )

Description. Female. Small size, short, body surface smooth and interspersed with granules.

Head. Head and eyes not exserted above pronotal surface ( Fig. 20B ). Fastigium of vertex short; in dorsal view, width of vertex between eyes 1.6–1.7 times width of compound eye ( Fig. 20C ); anterior margin of fastigium arcuate, 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 a rounded-angle shape, frontal costa slightly concave between eyes ( Fig. 20D ), 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 equal to antennal groove diameter ( Fig. 20E ). Antennae short, filiform, antennal grooves inserted between inferior margin of compound eyes, 14-segmented, the 10th and 11th segment are the longest, about 4.0–5.0 times longer than its width. Eyes globose, lateral (paired) ocelli located in middle of compound eye height.

Thorax. Pronotum distinctly compresso-elevated, pronotal surface smooth and interspersed with dense granules ( Fig. 20A ). In dorsal view, anterior margin of pronotum acute angle protruding and reaching vertex between the middle of eyes; lateral carinae of prozona parallel and inconspicuous; humeral angle absentCpronotal process narrow, almost reaching knee of hind femur and its apex narrowly rounded. In profile, median carina of pronotum distinctly lamellate and arch-like; lower margin of hind process curved, external lateral carinae of metazona also curved, width of infrascapular area is 0.9 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 carinated, ventral margins slightly undulated or straight ( Fig. 21A, B ). Hind femora robust and short, 3.0 times as long as wide; with carinated and margins finely serrated ( Fig. 21C ); antegenicular denticles and genicular denticles right angled. Outer side of hind tibia with 5–6 spines, inner side with 6–7 spines ( Fig. 21D ). First segment of posterior tarsi longer than third, three pulvilli of first segment of posterior tarsi are increased in turn, apices of all pulvilli acute ( Fig. 21E ).

Abdomen. Ovipositor narrow and short, length of upper valvulae 2.8 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. 21F ).

Coloration. Body yellow brown or yellow green; antennae brown; both sides of postmedian of pronotum with one or two black spots. Hind femur brown. Hind tibia dark brown, with two light rings in the middle.

Male. Similar to female, but smaller and narrower ( Fig. 21G, H ). Width of vertex between eyes 1.5 times width of compound eye ( Fig. 21G ). Subgenital plate short, cone-shaped, apex bifurcated.

Measurements (mm). Length of body: ♁ 9.0–9.5, ♀ 9.5–10.0; length of pronotum: ♁ 7.0–7.5, ♀ 7.8–8.5; length of hind femur: ♁ 4.8–5.5, ♀ 5.5–6.0.

Type material. Holotype: ♀, China, Zhejian prov. , Yueqing (Yandangshan), 28°21ʹ35.33ʹʹ N, 121°8ʹ16.96ʹʹ E, 400 m alt., 10 August 2018, collected by Wei-An Deng, CLSGNU . Paratypes. 1♁, 6♀, same data, CLSGNU ; 5♁, 4♀, China, Zhejian prov. , Yueqing (Tashan), 28°8ʹ7.16ʹʹ N, 120°58ʹ12.81ʹʹ E, 250 m alt., 9 August 2018, collected by Wei-An Deng and Chao-Mei Huang, CLSGNU .

Diagnosis. This new species is similar to Formosatettix cliva Deng , sp. nov. and Formosatettix xueshanensis Zheng & Ou, 2010 , but is easily distinguished by morphological characters as shown in Table 4 .

Etymology. The new species was named after the type locality, Yueqing, Zhejian, China; adjective.

Distribution. P. R. CHINA: Zhejian.

Figures

FIGURE 20. Formosatettix yueqingensis 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 21. Formosatettix yueqingensis 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).