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 cylindrical, curved, without projections at both ends, 5-6 μm in diam., 50-100 μm long (Illustrations of Japanese fresh-water algae, 1977).

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O. parvulum x 7 μm Akigase Park Saitama, 2002	O. parvulum μm Omine-numa Tsukiyono Gunma, 2003	O. parvulum μm Kejo-numa Furukawa Miyagi, 2003	O. parvulum 155 x 6.5 μm Watarase Wetland Fujioka Tochigi, 2005
O. parvulum ? 117 x 7-8.5 μm Minuma-no-numa Omiya daisan p. Saitama, 2005	O. parvulum 70 x 7 μm Okubo Ryoke Akigase park Saitama, 2005	O. parvulum 60 x 5 μm near Akai wetland Aizuwakamatsu Fukushima, 2005	O. parvulum x 5 μm near Karakemi marsh Omachi Nagano, 2005
O. parvulum 70 x 5 μm Ichinose-enchi Norikura highland Nagano, 2005	O. parvulum 195 x 5 μm Shijuhachi-ike Shiga highland Nagano, 2005	O. parvulum 110 x 6 μm Azami-ike Norikura highland Nagano, 2006	O. parvulum 115 x 9 μm Tane-ike Togakushi highland Nagano, 2006

Similar genus -->> Centritractus

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