Family: Unicells; cell wall separating into two parts (Illustrations of The Japanese Fresh-water Algae, 1977).
Genus: With two equal-length flagella, cell body within a test consisting of two cup-shaped parts; test surface hairly or granular; a single chloroplast cup-shaped, with a prenoid (Photomicrographs of the Freshwater Algae, 1998).

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P. lenticularis cell 7 x 6 μm test 16 x 14 μm flag. 25 μm Kawagoe Saitama, 2001	P. lenticularis test 18 x 17 μm test 17 x 16 μm test 14 x 14 μm Kawashima or Kawajima Saitama, 2002	P. lenticularis cell 9 μmφ test 14 x 13 μm flag. 20 μm Hanyu Saitama, 2003	P. lenticularis cell μmφ test 17 μm flag. μm Hanyu Saitama, 2006
P. lenticularis cell μmφ dividing cell Daidarabotchi-ike Iizuna-kogen Nagano, 2003	P. lenticularis cell μmφ test μm flag. μm S-M general park Showa Saitama, 2003

Similar genus -->> Hemitoma; Coccomonas;

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