Baiyuerius gen. nov., a new genus of Coelotinae (Araneae, Agelenidae) spiders from China and Vietnam.

Baiyuerius gen. nov. , a new genus of the subfamily Coelotinae F. O. Pickard-Cambridge, 1893 is described, including five new species: B.daxi sp. nov. (♀), B.pindong sp. nov. (♂), B.tamdao sp. nov. (♀), B.zhuping sp. nov. (♂) and B.zuojiang sp. nov. (♂♀), from southern China and northern Vietnam. Our molecular phylogenetic analyses support Baiyuerius gen. nov. as monophyletic and as a sister group of the newly established genus Yunguirius Li, Zhao & Li, 2023.