Family: Colonies consisting of a fixed number of cells (Illustrations of The Japanese Fresh-water Algae, 1977).
Genus: Similar to Eudorina, but sexual reproduction by isogamy (An Illustrated Guide to Freshwater Zooplankton in Japan, 2000).

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Y. unicocca ? or E. cylindrica ? col. 32 x 16 μm cell 8 μm φ Ichikawa Chiba, 2001

Y. unicocca ? col. 53 x 41 μm cells 8.5 μm Mizumoto Park Tokyo, 2001

Y. unicocca ? col. 44 x 33.5 μm cells 7 μm Japan, 2000

Y. unicocca ? col. 53 x 41 μm Ichinokawa Yoshimi Saitama, 2006

Similar genus -> > Eudorina; Pandorina;

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