Genus: Unicellular; planktonic; cell body elongated cylindroid, curved or twisted; both ends rounded, with spiny projections; cell wall not separated into two parts (compare to Centritractus); several chloroplasts plate-like, without pyrenoids (Guide book to the "Photomicrographs of the Freshwater Algae", 1998).
Species: Cell body 5-7 (-10) μm wide (Süßwasserflora von Mitteleuropa 3, Xanthophyceae 1, 1978). Cell body with short spiny projections at both ends, 5-10 μm in diam., 50-300 μm long (Illustrations of Japanese fresh-water algae, 1977).

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O. capitatum 210 x 7 μm 215 x 5.5 μm Hasu-ike Shiga highland Nagano, 2005	O. capitatum 80-110 x 7 μm Kejo-numa Furukawa Miyagi, 2003	O. capitatum 62 x 3.5 μm Shikinawa-ike Fukuoka, 2001	O. capitatum 55-150 x 9-10 μm Oyomi marsh Hakuba Nagano, 2006
O. capitatum 110 x 6 μm Karakemi m.1 Omachi Nagano, 2007	O. capitatum μm Kannon-numa Shimogo Fukushima, 2008

Similar genus -->> Centritractus

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