Parasimulium is a genus of black flies containing two subgenera and four species. They are found in western North America. Most species are rare, and some Canadian species are cave dwellers.
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