Acilius is a holarctic genus of diving beetles in the family Dytiscidae and typically has a life cycle that is univoltine.

[1][2] Despite the prevalence of some species, one species, A. duvergeri, is listed as vulnerable on the IUCN Red List.

[1] The genus Acilius contains the following 13 extant species in 2 subgenera:[3] Subgenus Acilius: Subgenus Homoelytrus These three extinct species are known only from fossils:[1]

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