Acilius (beetle) explained

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]

Species

The genus Acilius contains the following 13 extant species in 2 subgenera:^[3]
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, 1758)
• Acilius sylvanus Hilsenhoff, 1975

Subgenus Homoelytrus

• Acilius duvergeri Gobert, 1874

Extinct species

These three extinct species are known only from fossils:^[1]

• †Acilius florissantensis Wickham, 1909
• †Acilius oeningensis (Heer, 1847)
• †Acilius praesulcatus Lomnicki, 1894

Notes and References

1. Bergsten. Johannes. Miller. Kelly B.. 2006. Taxonomic revision of the Holarctic diving beetle genus Acilius Leach (Coleoptera: Dytiscidae). Systematic Entomology. en. 31. 1. 145–197. 10.1111/j.1365-3113.2005.00309.x. 2006SysEn..31..145B . 54001536. 1365-3113.
2. Book: Miller, K.B. . J. Bergsten . Diving Beetles of the World: Systematics and Biology of the Dytiscidae . 2016 . 131–132 . JHU Press . 978-1-4214-2054-7 .
3. Web site: Anders N. . Nilsson . Jiří . Hájek . A World Catalogue of the Family Dytiscidae or the Diving Beetles (Coleoptera, Adephaga) . 2021 . 1.I.2021 .