Family: Pseudostome ventral, more or less invaginated (Illustrated Guide, 1985).
Genus: Test circular, ovoid or discoid; pseudostome eccentric (acentric), circular or ovoidal; with or without spines (Kudo, 1966).
Species:

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C. discoides 190, 200 μm φ 2, 5 spines Japan, 199?	C. discoides 166 μm φ 4-7 spines Japan, 199?	C. discoides 180 μm φ 5 spines Japan, 199?	C. discoides 180 μm φ 2 spines Japan, 199?
C. discoides 180 μm φ 7 spines Higusa-numa Hikari Chiba, 2003	C. discoides 175 x 155 μm 4 spines Shirakobato water p. Koshigaya Saitama, 2005

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