Family FRONTONIIDAE Kahl, 1926

For	Chiliferidae

Prebuccal area shallow or absent; several ophryokineties to right of oral area; three peniculi in buccal cavity, in anterior third of body; cytostome expansible, and area rich in nematodesmata and specialized phagoplasm; single contractile vacuole; body usually large; cysts common in some species; mostly herbivorous in feeding preference and free-living, but one species commensal on gills of Amphioxus.

Disematostoma Lauterborn, 1894. Several species.
Frontonia Ehrenberg, 1838. Many species.
Frontoniella Wetzel, 1927. Few species.
Wenrichia Jankowski, 1967 (syn. Disematostoma p.p.). Single species.
Incertae sedis:
Schistophrya Kahl, 1933; single species.
Sigmostomum Gulati, 1925: single species.