Genus: Highly flattened; pellicle firm; body form constant (Kudo, 1966). Chloroplasts small, discoid, pyrenoids usually absent; most species flat and leaf-shaped; often with ridges or fins running helically or longitudinally (Illustrated Guide, 1985).
Species:

P. circulatus 47 x 37 μm Myoyo Fukiage Saitama, 2004

P. circulatus ? 55 x 38 μm near Yamaguchi Univ. Yamaguchi, 2004

P. circulatus ? 45 x 33 μm Onnenai Kushiro marsh Hokkaido, 2005

P. circulatus ? 40,43 x μm Nozomiko 2 Iiyama Nagano, 2007

Similar species -->> P. acuminatus;

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