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Oligohymenophorea (formerly Nassophorea): Peniculida: Frontoniina: Frontoniidae

Frontonia marina
Farre-Dom., 1891
Syn: F. leucas var. marina Florentin, 1899

Frontonia marina 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; anterior half of the cell broader than posterior half; posterior end slightly pointed; two ovoidal micronuclei; a single contractile vacuole (Kahl, 1930).


Frontonia marina, stock Ssos-5, cell body about 320 μm long, 130 μm wide, x 400, x 640, Shiba river, near Owada Park, Saitama city, Saitama Pref., Japan, April 3, 2005 by Y. Tsukii
scale 50 μm scale 100 μm scale 150 μm; x 400 : scale 31 μm scale 63 μm scale 94 μm; x 640
Frontonia Frontonia Frontonia
Cell body 275 μm long, 135 μm wide, x 400, x 640
Frontonia Frontonia Frontonia

* F. marina Fabre-Dom., 1891 (F. leucas var. marina Florentin, 1899): Cell body 150-600 μm long; anterior half of the cell broader than posterior half; posterior end slightly pointed; two ovoidal micronuclei; a single contractile vacuole (Kahl, 1930).

F. acuminata Ehrenberg, 1833 (F. acuminata var. angustata Kahl, 1931; F. arenaria Kahl, 1933): Ovoid, 60-100 μm long; cytostome ovoid; a single macronucleus and single micronucleus anterior; a single contractile vacuole central; numerous large trichocysts (Carey, 1992).

F. depressa (Stokes, 1886) (F. parvula Penard, 1922): Cell body 60-80 μm long; macronucleus short sausage-shaped; a single micronucleus; a single contractile vacuole (Kahl, 1930).

F. macrostoma Dragesco, 1960: Ovoid, small 125-230 μm long; very large oral aperture, well defined suture; a large macronucleus with single micronucleus; a contractile vacuole posterior; many large trichocysts; pellicle with interkinetal striation (Carey, 1992)

Frontonia elliptica Beardsley, 1902: Cell body 150-200 μm long; macronucleus ovoid, with a single micronucleus large, ovoid in shape; two contractile vacuoles present (Kahl, 1930).

Frontonia fusca (Quennerstedt 1869): Cell body 150-200 μm long; macronucleus ovoid, with a small micronucleu; a single contractile vacuole located at posterior half of the cell body (Kahl, 1930).


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