Joining the dark side: waterfall spiders in subterranean habitats, with the description of a new genus and two new species from Brazil (Araneae: Trechaleidae)

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  Joining the dark side: waterfall spiders in subterranean habitats, with the description of a new genus and two new species from Brazil (Araneae: Trechaleidae) Abstract Trechaleidae is a family of spiders often recognized by its semiaquatic species, but its diversity extends beyond these well-known examples. In this study, we describe Troglotrechalea gen. nov. , a new genus with two novel species, T. faleroae spec. nov. and T. agorai spec. nov. , found exclusively in subterranean habitats within karst formations in central and southeastern Brazil. Both species exhibit pale coloration, but unmodified eyes and legs if compared to other species in the family. The slight degree of troglomorphism, along with their geographic and habitat records, suggests that these species are restricted to hypogean habitats, although they probably move through epigean habitats. Additionally, we report in detail the occurrence of the trechaleid genera Enna O. Pickard-Cambridge, 1897, Heidrunea Brescovi...

Asiopisinus gen. nov., a new genus of the family Theridiidae Sundevall, 1833 (Araneae, Theridiidae) from eastern Asia

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Asiopisinus gen. nov., a new genus of the family Theridiidae Sundevall, 1833 (Araneae, Theridiidae) from eastern Asia

Abstract

Based on morphological evidence and prior molecular phylogenetic results by Liu et al., a new genus, Asiopisinus gen. nov., is described from East Asia. The new genus comprises A. cheni sp. nov. (♂♀) as the type species, along with seven species transferred from Episinus Walckenaer, 1809: A. anfu (Liang, Liu, Yin & Yu, 2025) comb. nov., A. baoshanensis (Liu, Irfan & Peng, 2019) comb. nov., A. implicatus (Liang, Liu, Yin & Yu, 2025) comb. nov., A. nubilus (Yaginuma, 1960) comb. nov., A. ornithorhynchus (Liu, Agnarsson, Liu & Zhu, 2022) comb. nov., A. pseudonubilus (Liang, Liu, Yin & Yu, 2025) comb. nov., and A. yoshidai (Okuma, 1994) comb. nov.. The male of A. implicatus (Liang, Liu, Yin & Yu, 2025) comb. nov. is described for the first time. In addition, remarks and photos of some Chinese Episinus species are provided. The distribution records of all Asiopisinus gen. nov. species have been mapped.

Hu, C., Wei, M., Liu, J. & Xu, X. (2025) Asiopisinus gen. nov., a new genus of the family Theridiidae Sundevall, 1833 (Araneae, Theridiidae) from eastern Asia. Zootaxa, 5660 (4), 475–504. https://doi.org/10.11646/zootaxa.5660.4.2