Family: Oral nematodesmata not a ring around mouth, more prominent to side and rear of mouth; typically 3 long, large polykinetids in oral cavity; cytostome expands along postoral suture .
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).

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DV images (17 samples; 204 images) New !
RAPD tree of Frontonia (Tsukii, Jpn. J. Protozool., vol. 36, 2002)

Cell body large: more than 150 μm long
F. leucas 500-550 μm Mac. elongated multi. micronuclei 199?-2002	F. leucas ? 255 x 100 μm C.V. with canals Toneri Park Tokyo, 2001	F. marina 12 samples 150-320 μm Mac. spherical two large mic. anterior broad 1997-2005	F. microstoma 163 x 48 μm Japan, 1998
With endosymbiotic algae
F. vernalis 325 μm trich. 10.5 x 1.5 μm With Chlorella USA, 1999	F. vernalis 264 x 110 μm trich. 9 x 1.5 μm With Chlorella Sanda Hyogo, 2001	F. vernalis 310 x 154 μm Onnenai Kushiro marsh Hokkaido, 2005
Frontonia sp. stock Tms-1 trich. 9 x 1.7 μm with algae μm 1 Mic. ? Tochigi, 2002	Frontonia sp. stock Tms-1 trich. 8 x 1.5 μm with algae μm 1 Mic. ? Tochigi, 2002	Frontonia sp. stock Tms-2 trich. μm with algae μm 1 Mic. ? Tochigi, 2002
Cell body small: less than 150 μm long
F. acuminata 9 samples 100-128 μm one large mic. Japan, 1998-2005	F. elliptica 114 x 60 μm C.V. 2 trich. 5.5 x 1 μm Yamato Kanagawa, 2003	F. elliptica μm C.V. 2 Iruma River side Tsurugashima Saitama, 2003	F. depressa 6 samples 72-109 μm Japan, 1998-2008 Movies
Frontonia sp. F. fusca ? 145 x 60 μm mac. ellipsoidal Shirakawa Fukushima, 1999	Frontonia sp. or Frontoniella ? 130 x 78 μm mac. ellipsoidal Higashi-Matsuyama Saitama, 2001	Frontonia sp. or Frontoniella ? 105 x 73 μm Kamishiro Hakuba Nagano, 2004

Similar Genus --> Disematostoma

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