Family: Colonies consisting of a fixed number of cells (Illustrations of The Japanese Fresh-water Algae, 1977).
Genus: Colony spherical; 8-16 cells of similar size, close together, mutually compressed; 2-layered gelatinous envelope; cells with 2 equal-length flagella; 2 contractile vacuoles anterior; nucleus central (Illustrated Guide, 1985). Sexual reproduction by isogamy (An Illustrated Guide to Freshwater Zooplankton in Japan, 2000). Sexual reproduction by iso- or anisogamy (Süßwasserflora von Mitteleuropa 9, Chlorophyta I, 1983).

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Cell contains only one pyrenoid
P. morum 35 samples col. 28-57 μm 1998-2006	P. morum 35 samples col. 28-57 μm 1998-2006	P. morum 35 samples col. 28-57 μm 1998-2006	P. morum 35 samples col. 28-57 μm 1998-2006
Cell contains several pyrenoids
P. colemaniae 12 samples col. 34-49 μm 2000-2008	P. colemaniae 12 samples col. 34-49 μm 2000-2008	P. colemaniae 12 samples col. 34-49 μm 2000-2008	P. colemaniae 12 samples col. 34-49 μm 2000-2008
P. charkowiensis ? col. μm cell μm φ Lake Biwa Maihara Shiga, 2003

Similar genus -> > Yamagishiella

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