Family: Usually polypodial, pseudopods granular, cylindroid.
Genus (Linnaeus, 1858), emend King & Jahn, 1948: Pseudopods ridged; multinucleate (Illustrated Guide, 1985).

C. carolinense 5 clips μm Shingashi river Kamifukuoka Saitama, 1999

C. carolinense 2 clips μm Shingashi river Kamifukuoka Saitama, 1999