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:
Ovoid, 60-100 μm long; cytostome ovoid;
a single macronucleus and single micronucleus anterior; a single contractile vacuole central;
numerous large trichocysts (Carey, 1992).
Cell body 60-150 μm long (Kahl, 1930).
F. acuminata var. angusta: Cell body 80-100 μm long (Kahl, 1930).
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