Onychohydrus is a genus of beetles in the family Dytiscidae, containing the following species: \n* Onychohydrus hookeri (White, 1846) \n* Onychohydrus scutellaris (Germar, 1848)
Species taxanomy provided by GBIF Secretariat (2022). GBIF Backbone Taxonomy. Checklist dataset https://doi.org/10.15468/39omei accessed via GBIF.org on 2023-06-13; License: CC BY 4.0