Family: Unicells; cell wall separating into two parts (Illustrations of The Japanese Fresh-water Algae, 1977).
Genus: Unicellular; two equal-length flagella emerging from anterior end; cell body flat, broad ovoidal, lateral view spindle-shaped, within a gelatinous sheath quadrangular in shape; a single chloroplast plate-like, with 4-6 pyrenoids (Guide book to the "Photomicrographs of the Freshwater Algae", 1998).

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P. aculeata cell 21 x 12 μm sheath 30 x 18 μm S-M general park Showa Saitama, 2003	P. aculeata cell μm sheath μm Shimo-muneoka Shiki Saitama, 2004	P. angulosa ? 12 x 8 μm Watarase river Ashikaga Tochigi, 2004	Pteromonas sp. ? or Vitreochlamys ? test 19 x 15 μm cell 14 x 9 μm Saitama, 1999
P. cordiformis test 13 x 11 μm cell 11 x 7 μm Sayama Saitama, 2001	P. cordiformis test μm cell μm Naruto Chiba, 2003	P. cordiformis ? test μm cell 9-11 x 6.5-9 μm Shiken-zaike Kamikawa Saitama, 2004
P. multipyrenoidea or P. cordiformis ? test μm cell μm Naruto Chiba, 2003	P. multipyrenoidea or P. cordiformis ? test μm cell 15 x 8 μm Shimo-muneoka Shiki Saitama, 2004	P. multipyrenoidea test 16 x 11 μm cell 13 x 9 μm Akigase park Saitama, 2005
P. multipyrenoidea test 23 x 17 μm cell 17 x 13 μm Toyonodai park Otone Saitama, 2006	P. multipyrenoidea test 22 x 17 μm cell 20 x 10 μm Sakitama-kofun p. Gyoda Saitama, 2006

Similar genus -->> Coccomonas;

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