Genus: Postoral kineties usually to left of oral poykinetids (Illustrated Guide, 1985).
Left edge is more curved than right edge; cytopharynx with numerous strong fibrils; ectoplasm with
numerous fusiform trichocysts; macronucleus oval; one to several micronulei (Kudo, 1966).
Species: Anterior wider than the posterior, 200-300 μm long; cytostome small & elongate; preoral suture distinctive; an elongate macronucleus; large contractile vacuole; many small trichocysts (Carey, 1992). Cell body 200-300 μm long (Kahl, 1930).