Formosatettix tangjiaheensis 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 : 229-230

14. Formosatettix tangjiaheensis Deng , sp. nov. ( Figs. 18 , 19 , 24R , 25E )

Description. Female. Small size, short, body surface smooth and interspersed with sporadic small tubercles.

Head. Head and eyes not exserted above pronotal surface ( Fig. 18B ). Fastigium of vertex short; in dorsal view, width of vertex between eyes 2.2–2.4 times width of compound eye ( Fig. 18C ); anterior margin of fastigium arcuate and slightly concave on both sides of median carina and undulated, distinctly 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 acute angle and distinctly projected above dorsal margin of the compound eye ( Fig. 18D ); frontal costa distinctly concave between eyes, 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 1.5 times antennal groove diameter ( Fig. 18E ). Antennae short, filiform, antennal grooves inserted below inferior margins of compound eyes, 15-segmented, the 10th and 11th segment are the longest, about 2.5–3.0 times longer than its width. Eyes globose, lateral (paired) ocelli located in lowest third of compound eye height.

Thorax. Pronotum compressed and distinctly tectiform, its surface smooth and with sporadic small tubercles ( Fig. 18A ). In dorsal view, median carina of pronotum slightly lamellate elevated, anterior margin of pronotum obtuse protruding and reaching vertex between posterior margins of eyes; lateral carinae of prozona slightly constricted backwards; humeral angle arched, interhumeral carina absent; hind pronotal process broad and short, reaching 1/2–2/3 of hind femur and its apex broadly arcuate. In profile, median carina of pronotum arch-like; lower margin of hind process distinctly curved, external lateral carinae of metazona slightly 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 of fore femora sinuate and with two inconspicuous teeth ( Fig. 19A ), ventral margins of middle femora sinuate ( Fig. 19B ). Hind femora robust and short, 3.4 times as long as wide; dorsal margin and ventral margin slightly lamellate and finely serrated ( Fig. 19C ); antegenicular denticles right angled and genicular denticles acute. Outer side of hind tibia with 7–8 spines, inner side with 5–6 spines ( Fig. 19D ). First segment of posterior tarsi longer than third, three pulvilli of first segment of posterior tarsi equal in length, apices of all pulvilli obtuse ( Fig. 19E ).

Abdomen. Ovipositor narrow and long, length of upper valvulae 4.6 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. 19F ).

Coloration. Body dark brown or brown; some of individuals with two black spots on both sides of postmedian of pronotum. Fore and middle tibiae with two black bands. Hind femur brown, outer part lower side black; outer part of hind femur with two black spots in some of individuals. Hind tibia black, with two light rings in the middle.

Male. Similar to female, but smaller and narrower ( Fig. 19G, H ). Width of vertex between eyes 2.0 times width of compound eye ( Fig. 19G ); width of infrascapular area is 1.1 mm. Subgenital plate short, cone-shaped, apex bifurcated.

Measurements (mm). Length of body: ♁ 9.5, ♀ 12.8–13.1; length of pronotum: ♁ 6.8, ♀ 9.0–9.4; length of hind femur: ♁ 5.8, ♀ 6.8–7.2.

Type material. Holotype: ♀, China, Sichuan prov., Qingchuan (Tangjiahe), 32°34ʹ27ʹʹ N, 104°45ʹ23ʹʹ E, 1360 m alt., 06 August 2019, collected by Wei-An Deng, CLSGNU . Paratypes. 1♁, 4♀, same data, CLSGNU .

Diagnosis. This new species is similar to Formosatettix yunnanensis Zheng, 1992 and Formosatettix guangyuanensis sp. nov., but is easily distinguished by morphological characters as shown in Table 2 .

Etymology. The new species was named after the type locality, Tangjiahe, Qingchuan, Sichuan, China; adjective.

Distribution. P. R. CHINA: Sichuan.

Figures

FIGURE 18. Formosatettix tangjiaheensis 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 19. Formosatettix tangjiaheensis 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).