Abstract
Tetrix gibberosa (Wang Zheng) is a high-backed pygmy grasshopper species from eastern PR China. Due to its reduced hind wings and pleomorphism (length changes of hind wings and the hind pronotal process, which is generally called macropterous and brachypterous morphs), the species have been described into different species which involve several taxonomically confused genera. This study clarifies its taxonomy and distribution and provides ecological information for the species. At the same time, we comment the relationships of related genera in the subfamily Tetriginae, including Tetrix Latreille, Exothotettix Zheng Jiang, Alulatettix Liang, Aalatettix Zheng Mao, Formosatettix Tinkham, and Formosatettixoides Zheng. Additionally, we report for the first time that nematodes can parasitize pygmy grasshoppers. New synonyms are proposed: Tetrix gibberosa (Wang Zheng, 1993) = Alulatettix bulbosus Zheng Zhong, 2001, syn. nov., = Exothotettix jiangxiensis Liang Jia, 2008, syn. nov., = Tetrix glochinota Zhao, Niu Zheng, 2010, syn. nov., = Alulatettix nigromarginalis Zhang, Deng Zha, 2014, syn. nov., = Alulatettix flavotibialis Zhang, Deng Zha, 2014, syn. nov..
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