Suborder: Ventral cirri not as distinct files, except Gastrostyla.
Family: Frontoventral cirri scattered on forward part, sometimes on rear part; never on mid area of ventrum (Illustrated Guide, 1985).
Genus: Body lacks tail: cluster of 3 postoral cirri present; no frontoventral cirri behind that group (Illustrated Guide, 1985).
Urosomoides sp.
225 x 43 μm
Higashi-hiroshima
Hiroshima, 1998
Urosomoides sp.
μm
Kinu river
Takanezawa
Tochigi, 2004
