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: Elongate, narrowed posteriorly to form a pointed tail; dorsoventrally flattened; AZM small, 1/4 body length; marginal cirri confluent posteriorly; two macronuclei (Carey, 1992). Body may have tail; one or more frontoventral cirri; postoral cluster of 3 cirri present (Illustrated Guide, 1985).
->> Description at WPRNO Google Image Search
Urosoma sp.
70 x 15 μm
Japan, 1998
Urosoma sp.
60 x 15 μm
Saitama, 1999
Urosoma sp.
85 x 18 μm
Japan, 2000
