Genus: Cell body short, radiate in shape; apical view of the cell, triangular, polygonal, ellipsoidal or spindle-shaped; zygospores formed outside of mother cells (Illustrations of The Japanese Fresh-water Algae, 1977)
Subgenus: lacks arm-like projections (Illustrations of The Japanese Fresh-water Algae, 1977)
Species: semicells twisted with each other at isthmus (Illustrations of The Japanese Fresh-water Algae, 1977)

Google Image Search

Semicells elongated ellipsoid
v. alternans 30 x 29 μm Nagaike park Hachioji Tokyo, 2005	v. alternans 25 x 30 μm Aizu Recreation p. Aizuwakamatsu Fukushima, 2005	v. alternans 29 x 31 μm rice field Ichinoseki Iwate, 2005
v. alternans or S. lapponicum ? μm Omine-numa Tsukiyono Gunma, 2003	v. alternans or S. lapponicum ? 31 x 40 μm Hasu-ike Shiga highland Nagano, 2005
Semicells slightly diamond- or spindle-shaped
v. subalternans μm O-ike park Yabuki Fukushima, 2003	v. subalternans 20 x 22 μm Higashi-sano Hakuba Nagano, 2004	v. subalternans 24 x 28 μm Iyari marsh Omachi Nagano, 2006	v. subalternans x 29 μm Japan, 1998 Movies
Sv. subalternans 26 x 25 μm Uruguay, 1999	Sv. subalternans μm Imou bog Toyohashi Aichi, 2004	v. subalternans x 32 μm Kowashimizu Suwa Nagano, 2005	v. subalternans x 25 μm Kowashimizu Suwa Nagano, 2007
Sv. subalternans x 25 μm near Happou bus stop Hakuba Nagano, 2006

Similar species -->> C. lapponicum (semicells not twisted);

Please click on species name for more images

Copyright Protist Information Server