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 a 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.
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