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Dinophyceae: Peridiniales: Ceratiaceae
Dinoflagellida: Diniferina: Peridiniidae

 Ceratium furca
(Ehrenberg) Claparéde & Lachmann
or Ceratium furcoides (Levander) Langhans 1925 (Popovský & Pfiester 1990; John et al. eds. 2002)

Ceratium Genus: Body flattened; with one anterior and 1-4 posterior horn-like processes; chloroplasts yellow, brown, or greenish; numerous species (Kudo, 1960).
Species:

Ceratium furca (Ehrenberg) Claparéde & Lachmann, cell body 310 μm long, 58 μm wide, x 640, Komado marsh (or bog), Showa village and Tajima town, Fukushima Pref., Japan, August 22, 2004, 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
Ceratium hirundinella Ceratium hirundinella Ceratium hirundinella
Ceratium hirundinella Ceratium hirundinella Ceratium hirundinella Ceratium hirundinella Ceratium hirundinella

Ceratium hirundinella (O. F. Müller) Schrank: 95-100 μm; epicone is one long horn; hypocone as two or three horns; many varieties (How to know the protozoa, 1979). 200 μm long, 60 μm wide (Illustrations of The Japanese Fresh-water Algae, 1977).

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