Genus: Cigar- or foot-shaped; a single macronucleus and 1 to several vesicular or compact micronuclei
(Kudo, 1966).
Species: 180-300 μm long;
a compact micronucleus; two contractile vacuoles (Kudo, 1966).
Cylindrical or cigar-shaped; rounded anteriorly, pointed posteriorly; one large compact micronucleus ("caudatum" group)
approximately 8 μm diam.; two contractile vacuoles;
170-290 μm long (Wichterman, 1986).
Elongate, rounded anteriorly, pointed posteriorly; caudal cilia present;
180-280 μm long;
a single macronucleus with a single micronucleus; two contractile vacuoles (Carey, 1992).
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