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).
Species: Pink, 115-220 μm long;
peristome nearly 1/2 cell length with conspicuous undulating membrane; macronucleus
multinodal with 3-7 nodes (moniliform); 6-20 micronuclei (Giese, 1973).
150-300 μm long (How to know the protozoa, 1979).
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