Abstract
Two new pygmy grasshopper species are described from PR China and are assigned to Formosatettix Tinkham, 1937, a large Asian tetrigin genus composed of species with reduced tegmina and hind wings: F. leigongshanensis Zha & Ding, sp. nov. from Guizhou and F. wulongensis Zha & Ding, sp. nov. from Chongqing. We provide descriptions of morphology and habit, supplemented with photographs. Flying organs of the genus Formosatettix are discussed and the genus is compared with other Asian genera with reduced flying organs, such as Formosatettixoides Zheng, 1994 and Alulatettix Liang, 1993 in Tetriginae, Deltonotus Hancock, 1904, Epitettix Hancock, 1907 and Pseudepitettix Zheng, 1995 in Cladonotinae, and Macromotettixoides Zheng, Wei & Jiang, 2005 and Pseudomacromotettix Zheng, Li & Lin, 2012 in Metrodorinae.
Highlights
The genus Formosatettix Tinkham, 1937 was originally established for only two species from Taiwan, China – F. arisanensis Tinkham, 1937 and F. karenkoensis Tinkham, 1937, but today it is a large genus composed of 68 known species in China, Japan, Korea, Nepal, Pakistan and Russia (Wei et al 2019, Cigliano et al 2020)
There has been a lot of discussion on how to properly describe the tegmina and hind wings of Formosatettix
Specimens of Formosatettix have tegmina and hind wings present, but degenerated, very small, triangular and scaly or long-ovate, hind wind being distinctly longer than tegmenulum (Figs 1d, 5d)
Summary
The genus Formosatettix Tinkham, 1937 (subfamily Tetriginae) was originally established for only two species from Taiwan, China – F. arisanensis Tinkham, 1937 (type species) and F. karenkoensis Tinkham, 1937, but today it is a large genus composed of 68 known species in China, Japan, Korea, Nepal, Pakistan and Russia (Wei et al 2019, Cigliano et al 2020). Members of Alulatettix have a pair of conspicuous tegminal sinus (Zhang et al 2014), while those of Formosatettixoides have visible tegmina and hind wings (Zha and Zheng 2014). Member of Formosatettix, on the other hand, lack a pair of tegminal sinus and both tegmina and hind wings are invisible (Wei et al 2019). During investigations of pygmy grasshoppers in PR China, we have collected new data on members of the genus Formosatettix. We introduce two new members of the genus Formosatettix, namely F. leigongshanensis Zha & Ding, sp. We provide brief discussion on the morphology of the flying organs of Formosatettix, and compare the genus to allied genera
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