Asellota

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
 * Joeropsis Koehler, 1885
 * 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 Stenetrioidea Hansen, 1905 Gnathostenetroidoidea Kussakin, 1967
 * Asellidae Latreille, 1802
 * Stenasellidae Dudich, 1924
 * Pseudojaniridae Wilson, 1986
 * Stenetriidae Hansen, 1905
 * Gnathostenetroididae Kussakin, 1967
 * Protojaniridae Fresi, Idato & Scipione, 1980
 * Vermectiadidae Just & Poore, 1992