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Oligohymenophorea (formerly Nassophorea): Peniculida: Frontoniina: Frontoniidae

Frontonia depressa
(Stokes, 1886)
Syn. Frontonia parvula Penard, 1922

Frontonia depressa 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 60-80 μm long; macronucleus short sausage-shaped; a single micronucleus; a single contractile vacuole (Kahl, 1930).
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Similar Genus --> Disematostoma


Frontonia depressa, cell body 72 μm long, 36 μm wide, a single macronucleus anterior, two contractile vacuole central and just behind equator, x 400, x 640, Japan, November 1998, 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 depressa Frontonia depressa Frontonia depressa Frontonia depressa

Frontonia sp. small type, December December 1998 by Y. Tsukii
Frontonia depressa Frontonia depressa Frontonia depressa

* 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. 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. 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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