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: 40-55 μm long, 32-40 μm wide; a short caudal projection; pellicle with minute knobs arranged in longitudinal rows; flagellum about the body length (Kudo, 1966). 43-54 μm long; pointed rear; incurved anteriorly with small papilla; striated, about 12 rows of small knobs; fresh water (How to know the protozoa, 1979).

P. hispidulus = P. pomiformis 35-38 x 23-25 μm Higusa-numa Hikari Chiba, 2003	P. hispidulus = P. pomiformis 32 x 21 μm water reservoir near Yamaguchi Univ. Yamaguchi, 2004	P. hispidulus = P. pomiformis 22 x 19 μm Saitama, 1999	P. hispidulus = P. pomiformis μm Japan, 199?
P. hispidulus = P. pomiformis 38 x 23 μm Jodo-daira 3 Azuma mountain Fukushima, 2006	P. hispidulus = P. pomiformis 35 x 21 μm Jodo-daira 2 Azuma mountain Fukushima, 2006	P. hispidulus = P. pomiformis 27 x 19 μm near Yamaguchi Univ. Yamaguchi, 2004	P. hispidulus ? = P. pomiformis μm Naruto Chiba, 2003
P. hispidulus = P. pomiformis 36 x 22 μm Omine-numa Minakami Gunma, 2006	P. hispidulus = P. pomiformis μm Omine-numa Minakami Gunma, 2008	P. hispidulus = P. pomiformis 36 x 22 μm Iyari marsh 4 Omachi Nagano, 2007	P. hispidulus = P. pomiformis 36 x 22 μm Iyari marsh 1 Omachi Nagano, 2007

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