Genus: Colonies spherical, with inner empty space; cells attached to each other by a protrusion of cell wall, arranged in a single layer; cell body mostly spherical with some conical or grobular bulges; chloroplasts cup-shaped with a pyrenoid; reproduction by asexual coenobium (Illustrations of The Japanese Fresh-water Algae, 1977).
Species:

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C. astroideum colonies of 32 cells colony 50 μm cells μm Hiroshima, 1998 Movies	C. astroideum colonies of 32 cells colony μm cells μm Uruguay, 1999	C. astroideum ? colonies of 16 cells colony μm cells μm Japan, 1998
C. astroideum ? colonies of 16 cells colony μm cells μm USA, 1999	C. astroideum ? colonies of 16 cells colony μm cells μm Asaka Saitama, 2000	C. astroideum ? colonies of 16 cells colony μm cells μm Ueno Tokyo, 2001	C. astroideum ? colonies of 16 cells colony μm cells μm Uruguay, 1999
C. astroideum colonies of 16 cells colony 11, 22 μm cells μm Uruguay, 1999	C. astroideum colonies of 16 cells colony 20 μm cells μm Ueno Tokyo, 2001	C. astroideum colonies of 16 cells colony 28, 36 μm cells μm Koshigaya Saitama, 2001	C. astroideum colonies of 16 cells colony 27, 34 μm cells μm Shikinawa-ike Fukuoka, 2001
C. astroideum colony 20 μm cells μm Sayama Natural p. Saitama, 2001	C. astroideum or C. C. microporum? colony 30-44 μm cells μm Sayama Natural p. Saitama, 2001	C. astroideum colony 25 μm cells μm Nasu Tochigi, 2001	C. astroideum colony 25 μm cells μm Takamatsu Kagawa, 2002
C. astroideum colony 40, 50, 60 μm cells μm Aina-shinsui Park Kawagoe Saitama, 2002	C. astroideum colony 30 μm cells μm Heisei-no-mori Park Kawashima or Kawajima Saitama, 2002	C. astroideum colony μm cells μm Wan-park-land Kochi, 2002	C. astroideum colony 32 μm cells μm Iruma river Kawagoe Saitama, 2004
C. astroideum colony 30 μm cells 10 μm Kabuto-yama Nishi-no-miya Hyogo, 2004	C. astroideum colony 32 μm cells μm Imori pond Myoko highland Niigata, 2004	C. astroideum colony 25, 33 μm cells μm near Ayu river Fujioka Gunma, 2004

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