Suborder: Ventral cirri not as distinct files, except Gastrostyla.
Family: Frontoventral cirri scattered on forward, mid- and rear areas of ventrum.
Genus: Ellipsoid; flexible; ventral surface flattened; dorsal surface convex; 8 frontal, 5 ventral, 5 transverse, short caudal cirri (Kudo, 1966). Oral cavity not wide; macronuclei oval; marginal cirri confluent at rear; body laterally flexible (Illustrated Guide, 1985).

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O. lanceolata 118 x 52 μm Japan, 199?	O. lanceolata cysts 55 x 45 μm 40 μm φ Japan, 199?	O. lanceolata macronuclei μm Japan, 199?
O. lanceolata 122 x 47 μm Saitama, 1999	O. lanceolata 69 x 20 μm 85 x 34 μm 78 x 20 μm 65 x 20 μm 87 x 34 μm protargol stain Saitama, 1999
Oxytricha sp.1 132 x 32 μm Saitama, 1997	Oxytricha sp. 143 x 43 μm Sakitama-kofun p. Gyoda Saitama, 2004	Oxytricha sp. 113 x 45 μm Futayo-no-ike Haguro mountain Yamagata, 2005

Similar Genus -> > Histriculus; Stylonychia

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