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). Species:

50 μm 100 μm 150 μm; x 400

Oxytricha sp., with cysts, cell body 108 μm long, 40 μm wide, x 400, Japan, 199? by Y. Tsukii

Oxytricha sp., a process of cyst formation ?, x 400, by Y. Tsukii