Asellota is a suborder of isopod crustaceans found in marine and freshwater environments. Roughly one-quarter of all marine isopods belong to this suborder. Members of this suborder are readily distinguished from other isopods by their complex copulatory apparatus. Other characteristics include six-jointed antennal peduncle, the styliform uropods (a character shared with some other isopod groups), the fusion of pleonites 5, 4 and sometimes 3 to the pleotelson, and absence of the first pleopod in females.
Classification The suborder Asellota comprises these families: Some classifications also include the Microcerberidea within Asellota.
Janiroidea Sars, 1897 Acanthaspidiidae Menzies, 1962 Dendrotiidae Vanhöffen, 1914 Desmosomatidae Sars, 1899 Echinothambematidae Menzies, 1956 Haplomunnidae Wilson, 1976 Haploniscidae Hansen, 1916 Ischnomesidae Hansen, 1916 Janirellidae Menzies, 1956 Janiridae Sars, 1897 Joeropsididae Nordenstam, 1933 Katianiridae Svavarsson, 1987 Macrostylidae Hansen, 1916 Mesosignidae Schultz, 1969 Microparasellidae Karaman, 1933 Mictosomatidae Wolff, 1965 Munnidae Sars, 1897 Munnopsidae Lilljeborg, 1864 Nannoniscidae Hansen, 1916 Paramunnidae Vanhöffen, 1914 Pleurocopidae Fresi & Schiecke, 1972 Santiidae Wilson, 1987 Thambematidae Stebbing, 1913
Aselloidea Latreille, 1802 Asellidae Latreille, 1802 Stenasellidae Dudich, 1924 Stenetrioidea Hansen, 1905 Pseudojaniridae Wilson, 1986 Stenetriidae Hansen, 1905 Gnathostenetroidoidea Kussakin, 1967 Gnathostenetroididae Kussakin, 1967 Protojaniridae Fresi, Idato & Scipione, 1980 Vermectiadidae Just & Poore, 1992
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