Genus: Only 1 emergent flagellum; locomotory flagellum directed anteriorly, straight, during swimming; colourless, phagotrophic; no eyespot; rigid, solitary, ovoid, usually flat, with several keels; freshwater (Illustrated Guide, 1985). Oval or pyriform; not plastic; pellicle often with straight or spiral furrow; a single flagellum; many species (Kudo, 1966).

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P. bicarinata 5 samples 24-30 μm 1997-2008	Petalomonas sp. P. bicarinata ? cell μm flag. μm Iruma Saitama, 2003	P. alata cell 18 x 11 μm flag. 28 μm Saitama, 2000	P. alata ? cell μm flag. μm Kahan Park Kuroiso Tochigi, 2003
Petalomonas sp. 25 x 13 μm Shimo-no-koike Shiga highland Nagano, 2004	Petalomonas sp. 21 x 10 μm Shimo-no-koike Shiga highland Nagano, 2004	P. asymmetrica ? 19 x 9.5 μm flag. 24 μm Sagiyama Memorial P. Saitama, 2002	Petalomonas sp. 29,30 x 20 μm Kamonoyachi-numa Zao onsen Yamagata, 2005
Petalomonas sp. Hazama marsh Ashikaga Tochigi, 2006	Petalomonas sp.2 ? cell 12 x 9 μm flag. 20 μm Japan, 1998	Petalomonas sp.3 ? cell 17 x 15 μm flag. 20 μm Saitama, 1999

Similar genus -->> Notosolenus;

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