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. setigerum 27 x 11 μm Wan-park-land Kochi, 2002	P. setigerum 31 x 12 μm Japan, 1998	P. setigerum ? 31 x 13 μm Tokyo, 1998	P. setigerum ? 31 x 13 μm Japan, 1998
P. setigerum 31 x 8 μm Japan, 1997	P. setigerum 25 x 11 μm Kabuto-yama Nishi-no-miya Hyogo, 2004	P. setigerum 24 x 9 μm Senjo-ga-hara Nikko Tochigi, 2003	P. setigerum ? 24 x 9 μm near Yamaguchi Univ. Yamaguchi, 2004
P. setigerum ? 23 x 11 μm Imori pond Myoko highland Niigata, 2004	P. setigerum or Cyclidium ? 24 x 10 μm Nanbata castle p. Fujimi Saitama, 2005

Similar Genus ->> Uronema; Cyclidium

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