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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RAPD tree of Frontonia (Tsukii, Jpn. J. Protozool., vol. 36, 2002)

F. acuminata 116-130 x 65-70 μm Japan, 1998	F. acuminata 120 x 70 μm Japan, 1998	F. acuminata 100-122 μm Japan, 1999	F. acuminata Azure C staining Japan, 1999
F. acuminata 80 μm Tatebayashi Gunma, 2001	F. acuminata stock Tou-1 69 μm Ujiie (Sakura) Tochigi, 2001	F. acuminata stock Kgy-2 μm Yaku Island Kagoshima, 2001	F. acuminata 85 x 45 μm near Karakemi m. Yaku Island Omachi, 2005
F. acuminata 78 x 42 μm Numa-no-hara m. Madarao highland Niigata, 2005

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Kgy-2 μm 1 Mic. Yaku Island Kagoshima, 2001	Tou-1 μm 1 Mic. Ujiie (Sakura) Tochigi, 2001

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