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).
Species:
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