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This paper reviews the genus Microtachycines and establishes a new genus, Megatachycines gen. nov. One new species and two new combinations of the genus Megatachycines are recorded, i.e., Megatachycines pentus gen. et sp. nov., Megatachycines elongatus (Qin, Liu & Li, 2017) comb. nov., and Megatachycines trispinosus (Qin & Li, 2020) comb. nov. Images illustrating the morphology of all species of the genera Microtachycines and Megatachycines are provided.
In this paper, four new cave-dwelling species of the subgenus Tachycines (Gymnaeta) from Guangxi, Hunan and Jiangxi are described, i.e., Tachycines (Gymnaeta) quadratus sp. nov., Tachycines (Gymnaeta) shiziensis sp. nov., Tachycines (Gymnaeta) sparsispinus sp. nov. and Tachycines (Gymnaeta) papilious sp. nov. The female of Tachycines (Gymnaeta) liboensis Zhu, Chen & Shi, 2020 is recorded for the first time. Moreover, images illustrating the morphology of the four new and three previously described species are provided.