Family: Ovoid to ellipsoid, usually flattened; dense ventral cilia; oral area relatively large; ~ midventral; long, prominent cytoprOctober
Genus: Oral polykinetid 3 rectangular; oral area midventral (Illustrated Guide, 1985). Cytostome right of median line in posterior half; with 3-4 caudal cilia; contractile vacuole terminal (Kudo, 1966).