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Updated: Nov 26, 2025

A Concoction Pipeline for Generating Molecular Operational Taxonomic Units (MOTUs) Among Riparian and Aquatic Beetles
Published on: July 11, 2025
Taxonomy of Peruvian water beetles in the genus Hydrochus Leach, 1817 (Coleoptera: Hydrochidae)
1Department of Entomology, Museum of Comparative Zoology, Harvard University, Cambridge, MA 02138 USA. perkins@oeb.harvard.edu.
Abstract:
The taxonomy of Peruvian water beetles in the genus Hydrochus Leach, 1817 is presented. The known fauna now consists of 22 species, 14 of which are described as new species. The new species are diagnosed, and high-resolution images of the habitus and male genitalia of each species are given. The following new species are described: H. alternatus n. sp., H. astrictus n. sp., H. bisinuatus n. sp., H. bucapitus n. sp., H. cracentis n. sp., H. dualis n. sp., H. lescheni n. sp., H. obliquus n. sp., H. parvicollis n. sp., H. spinosus n. sp., H. subovatus n. sp., H. tambopaticus n. sp., H. tripartitus n. sp., and H. uniformis n. sp. New locality data are provided for H. argutus Knisch 1921, H. bituberculatus Perkins 2019, H. coeneni Makhan 1992, H. leei Perkins 2019, H. lobatus Perkins 2019, H. obscurus Sharp 1882, H. richteri Bruch 1915, and H. sagittarius Perkins 2019. Images of the habitus and male genitalia of H. coeneni Makhan 1992 are also given.
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