Family: Paoral membrane prominent, may be large and may project stiffly (Carey, 1992).
Genus: Ovoid to ellipsoid; peristome begins at anterior end and extends for 2/3 the body length; a conspicuous membrane at both edges; one to many posterior stiff sensory cilia (Kudo, 1966). Swimming as leaping movement.
Species:

->> Description at WPRNO

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P. marinum 110 x 47 μm near Seaside b.g. Himi Toyama, 2006	P. marinum 73 x 31 μm Japan, 1998	P. marinum 70 x 35 μm Maeda Furukawa Miyagi, 2003	P. marinum 65 x 22 μm Zenko-ji Nagano, 2003
P. marinum μm Wata-uchi-ike Chiba p. Chiba, 2008	P. marinum, x 400 64 x 30 μm Shirakawa Fukushima, 1999	P. marinum 62 x 26 μm Izumi-no-mori-koen Yamato Kanagawa, 2003	P. marinum 75 x 34 μm Yase water park Minakami Gunma, 2006
P. marinum ? μm Ohori-ike Fukuoka, 2001

Similar Genus ->> Uronema; Cyclidium

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