Genus: Test circular, ovoid or discoid; pseudostome eccentric, circular or ovoidal; with or without spines (Kudo, 1966).
Species:

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C. ecornis ? 230 x 240 μm Univ. A.V.M. Obihiro Hokkaido, 2005	C. ecornis ? 222 x 200 μm Mogami Central p. Shinjo Yamagata, 2006	C. ecornis ? 180 x 205 μm Kannon-numa Shimogo Fukushima, 2005	C. ecornis 170 x 173 μm Japan, 1998
C. ecornis 160 μm Kannon-numa Shimogo Fukushima, 2005	C. ecornis 150 x 140 μm Numa-no-hara m. Madarao highland Niigata, 2005	C. ecornis 155 μm rice field Ichinoseki Iwate, 2005	C. ecornis 150 μm φ 140 x 123 μm Japan, 199?
C. ecornis 62 x 65 μm Kisuge konuma Shimogo Fukushima, 2005	C. ecornis 54 x 49 μm Onnenai Kushiro marsh Hokkaido, 2005	C. ecornis ? 65 x 68 μm Nidanuma Tsuchiyu-onsen Fukushima, 2005

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