''Acilius'' is a
holarctic
The Holarctic realm is a biogeographic realm that comprises the majority of habitats found throughout the continents in the Northern Hemisphere. It corresponds to the floristic Boreal Kingdom. It includes both the Nearctic zoogeographical reg ...
genus of
diving beetles in the family
Dytiscidae
The Dytiscidae – based on the Greek ''dytikos'' (δυτικός), "able to dive" – are the predaceous diving beetles, a family of water beetles. They occur in virtually any freshwater habitat around the world, but a few species live ...
and typically has a life cycle that is univoltine.
Despite the prevalence of some species, one species, ''A. duvergeri'', is listed as vulnerable on the IUCN Red List.
Species
The genus ''Acilius'' contains the following 13 extant species in 2 subgenera:
Subgenus ''Acilius'':
* ''
Acilius abbreviatus''
Aubé, 1838
* ''
Acilius athabascae''
Larson, 1975
* ''
Acilius canaliculatus''
(Nicolai, 1822)
* ''
Acilius confusus''
Bergsten, 2006
* ''
Acilius fraternus''
(Harris, 1828)
* ''
Acilius japonicus''
Brinck, 1939
* ''
Acilius kishii''
Nakane, 1963
* ''
Acilius mediatus''
(Say, 1823)
* ''
Acilius semisulcatus''
Aubé, 1838
* ''
Acilius sinensis''
Peschet, 1915
* ''
Acilius sulcatus''
(Linnaeus
Carl Linnaeus (; 23 May 1707 – 10 January 1778), also known after his ennoblement in 1761 as Carl von Linné Blunt (2004), p. 171. (), was a Swedish botanist, zoologist, taxonomist, and physician who formalised binomial nomenclature, the ...
, 1758)
* ''
Acilius sylvanus''
Hilsenhoff, 1975
Subgenus ''Homoelytrus''
* ''
Acilius duvergeri''
Gobert, 1874
Extinct species
These three extinct species are known only from fossils:
* †''
Acilius florissantensis''
Wickham, 1909
* †''
Acilius oeningensis''
(Heer, 1847)
* †''
Acilius praesulcatus''
Lomnicki, 1894
References
Dytiscidae genera
{{Dytiscidae-stub