Crowsoniellidae is a monotypical family of beetles, in the suborder Archostemata. So far only a single species, Crowsoniella relicta, has been attibuted to this family. It is an minute animal (about 1.8 millimetres or 0.071 inches), that was collected in Central Italy from calcareous soil at the base of a chestnut tree. No other specimens have been found since.
- Pace, R. (1975). "An exceptional endogeous beetle: Crowsoniella relicta n. gen. n. sp. of Archostemata Tetraphaleridae from central Italy". Bollettino del Museo Civico di Storia Naturale di Verona 2: 445–458.