The genus Mesosmittia is cosmopolitan, thus occurring in all biogeographical regions except for Antarctica. Almost nothing or very little is known about its ecology, the larva of one species was described by Strenze (1950) as terrestrial, but adults can be collected using emergence traps set over rivulets. The genus was recently revised for the Neotropics with descriptions of new species. The genus comprises:
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