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: Cell body 150-600 μm long; posterior end slightly pointed; two ovoidal micronuclei; a single contractile vacuole (Kahl, 1930).

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

Type I: Anterior slightly wider than posterior
40-1a μm 2-3 Mic. Mac. spherical Uruguay, 1999	stock, Sao-1 posterior pointed 169 x 75 μm Omiya Saitama, 2001	stock, Sao-2 posterior pointed 150-190 x 48-65 μm Mac. ovoid Saitama, 2001	stock, Ssos-5 320 x 130 μm Shiba river near Owada Park Saitama, 2005
stock, Iao-2 180-205 x 65-75 μm Mac. spherical Hawaii, 2001
Type II: Anterior not wider than posterior
stock, Iao-1 200-225 x 70-90 μm Hawaii, 2001	stock, Shm-1 2 Mic. spherical 158-185 x 53-72 μm Shizuoka, 2001	Shm-1 158-185 x 53-72 μm 1-3 Mic. Shizuoka, 2001	D-5 Type II μm 1-2 Mic. Tokyo, 199?
Tna-1 μm 1-2 Mic. Tochigi,
Misc. type unkown
F. marina Type ? 250 x 94 μm Japan, 1997	F. marina Type ? 194 μm conjugating pair USA, 1999	F. marina ? 170 x 93 μm Okubo Ryoke Akigase park Saitama, 2004

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