Family [ Sciadiaceae ]: Unicells; planktonic; cell body ellpsoidal or cylindrical in shape; both ends rounded or slightly swelled, with spiny projections in some species; 2 or more chloroplasts plate-like, without pyrenoids; many leucosin granules present (Illustrations of The Japanese Fresh-water Algae, 1977).
Genus: Unicellular; planktonic; cell body elongated cylindroid, both ends with long spiny projections; cell wall separated into two parts overlapping at the mid-region;; several chloroplasts plate-like, without pyrenoids (Guide book to the "Photomicrographs of the Freshwater Algae", 1998).
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Similar genus -->> Ophiocytium
C. belenophorus ?
body 45 x 7 μm
spines 39-43 μm
Shikinawa-ike
Fukuoka, 2001
C. belenophorus ?
body 90 x 8 μm
spines 43, 35 μm
Akigase Park
Saitama, 2002
Centritractus sp.
body 14 x 7.5 μm
spines 32, 30 μm
Noda
Namegawa
Saitama, 2004
Centritractus sp.
body 44 x 5 μm
spines 21 μm
Teganuma
Kashiwa
Chiba, 2008
