The first genus with four sac-like structures in the vulva in the cobweb spider subfamily Theridiinae Sundevall, 1833 (Araneae: Theridiidae)

Posted by
  The first genus with four sac-like structures in the vulva in the cobweb spider subfamily Theridiinae Sundevall, 1833 (Araneae: Theridiidae) Abstract The morphological characters of copulatory organs are the most important basis in spiders for identification. In theridiids, a vulva with four sac-like structures is mostly associated with the subfamily Hadrotarsinae but has never been recorded in Theridiinae. Based on specimens collected from subtropical forest canopies in China, a new Theridiinae genus that has four sac-like structures in the vulva is described: Sactheridion gen. nov., with the type species S. chuan gen. & sp. nov. from Sichuan Province, China. Photos, diagnosis, description, and a distribution map of the new genus and new species are provided. Hu, C., Yao, Z., Liu, J. & Xu, X. (2026) The first genus with four sac-like structures in the vulva in the cobweb spider subfamily Theridiinae Sundevall, 1833 (Araneae: Theridiidae). Zootaxa, 5884 (1), 167–175. http...

A review of the genus Tyrannochthonius (Pseudoscorpiones: Chthoniidae) from Guangxi, China, with the description of eleven new species

Posted by

 


A review of the genus Tyrannochthonius (Pseudoscorpiones: Chthoniidae) from Guangxi, China, with the description of eleven new species

Abstract

Eleven new species of Tyrannochthonius from Guangxi Province in southern China are described, including detailed diagnosis and illustrations: T. baiseensis sp. nov. from Dayan Cave (Lingyun County), T. fenghuangensis sp. nov. from Unnamed Cave 3 (Bama Yao Autonomous County), T. laqiuensis sp. nov. from Laqiu Cave (Donglan County), T. longulimembrum sp. nov. from Guangyang Cave (Tiandong County), T. miridentatus sp. nov. from Xi’an Cave (Fengshan County), T. shenlongensis sp. nov. from Shenlong Cave (Huanjiang Maonan Autonomous County), T. xianguensis sp. nov. from Xiangu Cave (Yizhou District), T. xiannvyanensis sp. nov. from Xiannvyan Cave (Yizhou District), T. xiaoi sp. nov. from Unnamed Cave 1 (Xing’an County), T. yilingyanensis sp. nov. from Yilingyan Cave (Wuming District) and T. yui sp. nov. from Unnamed Cave 2 (Yufeng District). An identification key to all known species of Tyrannochthonius from China is also provided.

Sun, J., Guo, X., & Zhang, F. (2026). A review of the genus Tyrannochthonius (Pseudoscorpiones: Chthoniidae) from Guangxi, China, with the description of eleven new species. European Journal of Taxonomy, 1058(1), 1–81. https://doi.org/10.5852/ejt.2026.1058.3278