Asellus is a genus of freshwater isopod crustaceans in the family Asellidae. Species of the genus are native to Europe, Asia and Alaska. Members of the genus are commonly called waterlouse or waterslaters, among other names. They are found in canals, lakes, ponds, and other slow-moving water environments.
Species Asellus is divided into three subgenera which contain the following species:
Asellus (Asellus) Geoffroy, 1762 Asellus amamiensis Matsumoto, 1961 Asellus aquaticus (Linnaeus, 1758) Asellus balcanicus Karaman, 1952 Asellus epimeralis Birstein, 1947 Asellus ezoensis Matsumoto, 1962 Asellus hyugaensis Matsumoto, 1960 Asellus ismailsezarii Malek-Hosseini, Jugovic, Fatemi & Douady, 2022 Asellus kosswigi Verovnik, Prevorcnik & Jugovic, 2009 Asellus kumaensis Matsumoto, 1960 Asellus levanidovorum Henry & Magniez, 1995 Asellus monticola Birstein, 1932 Asellus musashiensis Matsumoto, 1961 Asellus primoryensis Henry & Magniez, 1993 Asellus shikokuensis Matsumoto, 1960 Asellus tamaensis Matsumoto, 1960 Asellus turanaicus Sidorov & Prevorčnik, 2016 Asellus hilgendorfii Bovallius, 1886
Asellus (Arctasellus) Henry & Magniez, 1995 Asellus alaskensis Bowman & Holmquist, 1975 Asellus birsteini Levanidov, 1976 Asellus latifrons Birstein, 1947
Asellus (Mesoasellus) Birstein, 1939 Asellus dybowskii Semenkevich, 1924
Phylogeny After Saclier et al. 2025:
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