Subgenus Tachycines (Gymnaeta) Adelung, 1902

Gymnaeta Adelung, 1902. Ann. Mus. Zool. Acad. Imp. Sciences St. Petersburg, 7: 62–66; Jacobson, G. G. 1905[1902-1905]. In Jacobson & Bianchi. Orthopteroid and Pseudoneuropteroid Insects of Russian Empire and adjacent countries. pp. 329, 352, 434. Kirby, W. F. 1906. Orthoptera Saltatoria, 2: 125; Karny, 1930. Archiv. klassif. u. phylogen. Ent., 1 (2): 64.

Tachycines (Gymnaeta) Karny, 1934 . Konowia, 13 (1–3): 218; Karny, 1937. Genera Insectorum, 206: 247; Storozhenko, 1990. Entomologicheskoe Obozrenie, 69 (4): 845, 846; Würmli. 1973. Mitteilungen der Entomologischen Gesellschaft Basel, 23 (1): 1–9; Liu & Zhang, 2001. Insects of Tianmushan National Nature Reserve, 98 [Eng. 101].

Diestrammena (Gymnaeta) Gorochov, 1992 . Proceedings of the Zoological Institute of the Russian Academy of Sciences, 245: 26–27; Gorochov, Rampini & Di Russo, 2006. Russian Entomol. J., 15: 355–360; Rampini, Di Russo & Cobolli, 2008. Monografie Naturalistiche, 3: 130–141; Jiao, Niu, Liu, Lei & Bi. Zootaxa, 1917: 55–60; Zhang & Liu, 2009. Zootaxa, 2272: 21–36; Gorochov, 2010. Far Eastern Entomologist, 206: 5–16; Gorochov, 2010. Far Eastern Entomologist, 212: 12–16.

Tachycines (Gymnaeta) Qin et al., 2018 . Zootaxa, 4374 (4): 451–475. Type species. Gymnaeta beresowskii Adelung, by subsequent designation; authority: Kirby, W.F. 1906. A Synonymic Catalogue of Orthoptera ( Orthoptera Saltatoria, Locustidae vel Acridiidae) 2: i-viii, 1-562

Diagnosis. Body size small to medium. Fore femur and hind femur without spines ventrally, hind tibiae with internal and external spines dorsally, arranged in groups. Hind metatarsus with apical spine dorsally, ventrally keeled or with bristles. Median lobe of male genitalia with lateral sclerotized plate and cracked into 2–4 lobes apically; epiphallus of various shape (A-shaped, H-shaped, nearly triangular, subquadrate, rectangular).

This subgenus differs from Tachycines (Tachycines) s. str. Adelung, 1902 by the absence of ventral spines on hind femur.