Genus: With vase-like lorica; body small, ovoid with rudimentary collar, a flagellum extending through it; protoplasmic body anchored to base by a contractile filament (Kudo, 1966). Subgenus: sessile, colonial. Species:

20 μm 40 μm 60 μm; x 1000

Poteriodendron petiolatum: Lorica 17-50 μm high; cell body 21-35 μm long; flagellum twice as long as cell body; contractile vacuole terminal (Kudo, 1966). Colony with each lorica separately stalked (How to know the protozoa, 1979).