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 (Illustrations of The Japanese Fresh-water Algae, 1977).
Species: Cell body small, (14-18)-22 μm long, (11-16.8)-22 μm wide, isthmus (11-16.8)-22 μm wide; (Illustrations of the Japanese fresh-water algae, 1977).

C. regnellii ? 25 x 20 μm Numa-no-hara m. Madarao highland Niigata, 2005	C. regnellii 20 x 16 μm Imou bog Toyohashi Aichi, 2004	C. regnellii 17 x 13 μm Koshigaya Saitama, 2001	C. regnellii 15 x 12 μm Muneoka Shiki Saitama, 2004
C. regnellii 15.5 x 15 μm 14 x 14 μm Norin Park Kawamoto Saitama, 2004	C. regnellii ? 21.5 x 18 μm Tanohara Natural p. Ontake highland Nagano, 2005	C. regnellii ? μm Ushidome-ike Norikura highland Nagano, 2007

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