Order & Family: Floating unicells or a colony embedded in a matrix; no differentiation of apical and base structures; only one family.
Genus: A spherical colony in which radial filamentous structure absent (Illustrations of The Japanese Fresh-water Algae, 1977).

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Coelosphaerium μm USA, 1999	Coelosphaerium μm Saitama, 2000	Coelosphaerium μm Akigase Park Saitama, 2002	Coelosphaerium μm Numappara marsh Kuroiso Tochigi, 2003
Coelosphaerium 3-4 μm Kido-ike Shiga highland Nagano, 2006	Coelosphaerium 3-4 μm Ko-numa Tsukiyono Gunma, 2007
Coelosphaerium cell 4 x 3 μm near Town Hall Shobu Saitama, 2004	Coelosphaerium cell 2-2.5 μm near City Hall Fujimi Saitama, 2004	Coelosphaerium cell μm Heisei-no-mori p. Kawashima Saitama, 2005	Coelosphaerium cell μm Nanbata castle p. Fujimi Saitama, 2005
Coelosphaerium cell 2.5-3 μm φ Univ. A.V.M. Obihiro Hokkaido, 2005

Similar genus -> Woronichinia (Syn. Gomphoshaeria)

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