The Crowsoniellidae are a monotypical family of beetles, in the suborder Archostemata. So far, only a single species, Crowsoniella relicta, has been attributed to this family. It is a minute animal (about 1.8 mm (0.071 in)) that was collected in central Italy from calcareous soil at the base of a chestnut tree. No other specimens have been found since.
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