Subgenus [ Eucosmarium ]: Cell body dorso-ventrally compressed, with strong constriction at the center, transverse section elliptical or diamond-shaped.
Section [ Ornatae ]: Semicells circular, ellipsoid, reniform; cell surface granulated or spiny (Illustrations of The Japanese Fresh-water Algae, 1977).
Species: Cell body deeply constricted, 32-40 μm long, 35-41 μm wide, constriction (isthmus) 11-13 μm wide, semicells reniform, apex slightly elevated and truncate, lateral margins convex and convergent upward, apex, lateral margins and the center of the semicells furnished with granules, other parts of cell walls smooth (Photomicrographs of the Freshwater Algae, vol. 3, 1985).
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C. ornatum 38 x 40 μm Iroha-numa Zao mountain Yamagata, 2005 |
C. ornatum 36 x 38 μm 37 x 38 μm Iroha-numa 2 Zao mountain Yamagata, 2006  |
C. ornatum 36 x 37 μm Iroha-numa 3 Zao mountain Yamagata, 2006 |
C. ornatum μm Iroha-numa 4 Zao mountain Yamagata, 2008 |
C. ornatum 37 x 37 μm Kannon-numa Shimogo Fukushima, 2005 |
C. ornatum 36 x 37 μm Kannon-numa Shimogo Fukushima, 2006 |
C. ornatum μm Kannon-numa Shimogo Fukushima, 2008 |
C. ornatum μm Kareki-numa Nikko Tochigi, 2008 |
C. ornatum μm Ko-numa 2 Minakami Gunma, 2008 |
C. ornatum ? 18 x 18 μm Shikinawa-ike Fukuoka, 2001 |
C. ornatum 29 x 33 μm USA, 1999 |
C. ornatum 34 x 35 μm Uruguay, 1999 |
