Genus: Unicellular; variable in shape; a constriction at the center of the cell body; mostly longer than wide; flattened; each semicell hemispherical, spherical, ellipsoidal, rectangular, pyramidal or kidney-shaped; no apical indentation
Subgenus [Eucosmarium]: Cell body dorso-ventrally compressed, with strong constriction at the center, transverse section elliptical or diamond-shaped.
Section [Pyramidatae]: Cell surface smooth; semicells pyramidal with flattened apex or trapezoid (Illustrations of The Japanese Fresh-water Algae, 1977).
Species:

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Apex flatted, semicell scalariform
C. hammeri v. protuberans μm Miyatoko m.5 Minami-Aizu Fukushima, 2008	C. hammeri v. protuberans 28 x 20 μm L/W=1.3 Hiroshima, 1998	C. hammeri v. protuberans 27 x 23 μm L/W=1.2 USA, 1999	C. hammeri v. protuberans 26 x 22 μm L/W=1.2 Uruguay, 1999
C. hammeri v. protuberans μm Maruta-ike Maibaru Fukuoka, 2008	C. hammeri v. protuberans μm Kareki-numa Nikko Tochigi, 2008	C. hammeri v. protuberans μm Kashibaru marsh Karatsu Saga, 2008

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