Genus: Elongate, ovoid; anterior apex often curves over the peristome; non contractile (Carey, 1992). In front of cytostome a two-layered undulating membrane on right edge; contractile vacuole and cytopyge terminal; rose-colored; many species (Kudo, 1966).

->> Description at WPRNO

B. americanum var. americanum intact cells 220-250 x 66 μm Tokyo, 199?	B. americanum var. americanum Azure C staining μm Tokyo, 199?	B. americanum var. americanum cell division μm Tokyo, 199?	B. americanum var. americanum conjugation μm Tokyo, 199?
B. americanum var. trinodatum intact cells μm Vermont-Maine USA, 1999 Movies	B. americanum var. trinodatum Azure C staining μm Vermont-Maine USA, 1999	B. americanum var. trinodatum cell division μm Vermont-Maine USA, 1999	B. americanum var. trinodatum cysts μm Vermont-Maine USA, 1999

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