Formosatettix Tinkham, 1937

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 : 202-203

Genus Formosatettix Tinkham, 1937

http://orthoptera.speciesfile.org/Common/basic/Taxa.aspx?TaxonNameID=1101952.

Formosatettix Tinkham, 1937: 237 ; Tinkham, 1939: 463; Bey-Bienko & Mistshenko, 1951: 107; Storozhenko, 1CCCCCCCc981: 8; Liang, 1991: 113; Zheng, 1992b: 326; Blackith, 1992: 78; Storozhenko & Ishikawa, 1993: 2; Liang, 1993: 73; Yin et al., 1996: 871; Otte, 1997: 101; Liang & Zheng, 1998: 182; Jiang & Zheng, 1998: 344; Kim & Kim, 2004: 263; Zheng, 2005: 348; Deng et al., 2007b: 314; Zheng, 2009: 130; Zheng, 2012: 8; Deng, 2016: 268; Wei et al., 2019: 1002 ; Zha et al., 2020: 61.

Type species. Formosatettix arisanensis Tinkham, 1937 by original designation.

Description and differential diagnosis. This genus is characterized by follow combination of features: head not exserted above upper level of pronotum; fastigium of vertex in dorsal view surpassing the anterior margin of eyes, generally much wider than width of one compound eye from above; anterior margin of fastigium arched or straight; pronotum compressed, dorsum tectiform, usually without humeral angle; in dorsal view, anterior margin of pronotum arcuate protruding, truncate or angular projecting; the apex of pronotum rounded or bilobate; in profile, median carina of pronotum high, arch-like or straight; posterior angles of lateral lobes turned downwards, apex of posterior angles obtuse rounded; posterior margins of lateral lobes of pronotum only with ventral sinus, the tegminal (upper) sinus absent; tegmina and hind wings invisible (generally vestigial hidden under pronotum or apterous); fore and middle femora elongated, with straight or undulated ventral margins.

Formosatettix is most similar to Alulatettix Liang, 1993 . The difference between the two genera occurs in the posterior margins of lateral lobes of pronotum and the flying organs. In Formosatettix , the posterior margins of lateral lobes of pronotum only with ventral sinus and tegminal (upper) sinus is absent; tegmina and hind wings are generally invisible (generally strongly reduced to minute scales completely hidden under pronotum or apterous). In Alulatettix , the posterior margins of lateral lobes of pronotum with ventral sinus and tegminal (upper) sinus; tegmina visible; and hind wings abbreviated but visible (not uncovering the pronotum). Formosatettix is also similar to Aalatettix Zheng & Mao, 2002 . The difference between the two genera is in tegminal sinus of the posterior margins of lateral lobes of pronotum. In Formosatettix , tegminal (upper) sinus is absent; in Aalatettix , tegminal (upper) sinus is present but inconspicuous. Therefore, Aalatettix may be considered a synonym of Formosatettix , but more studies are required to confirm this inference.

Composition and distribution: Altogether, 67 species are now assigned to the genus Formosatettix and found in China, Russia, Korea, Japan, Pakistan and Nepal ( Fig. 1 ).

Figures

FIGURE 1. Distribution map of the genus Formosatettix adapted from the Orthoptera Species File