Genus: Pseudopods meld at bases during polypodial locomotion; nucleus oval (Illustrated Guide, 1985). Usually polypodial; pseudopodia sometimes flattening and broadening towards ends; may be monopodial in rapid locomotion; no dorsal ridges (Page, 1976).
Species: Polypodal, 100-400 μm long; ecto- & endoplasm clear; nucleus, ellipsoid, 37-40 by 30-32 μm (Illustrated Guide, 1985). 200-400 μm; rarely monopodial; nucleus a prolate spheroid, 30-40 μm (Page, 1976). 400 μm; an average of 12 pseudopodia (How to know the protozoa, 1979).
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intact cells
Japan, 1998
Movies 
cyst formation ?
Japan, 1998
Movies 
intact cells
Japan, 1998
Movies 
intact cells
Saitama, 1999
intact cells
Ibaraki, 2000
intact cells
Nagaike park
Hachioji
Tokyo, 2005
intact cells
Shiba river
near Owada Park
Saitama, 2005
P. dubium
μm
Numa-no-hara m.
Madarao highland
Niigata, 2005
P. dubium
Onnenai
Kushiro marsh
Hokkaido, 2005
P. dubium
Tsutsuji-ga-oka
Tatebayashi
Gunma, 2006
P. dubium
Igashira park
Mooka
Tochigi, 2006
P. dubium
Ko-numa 3
Minakami
Gunma, 2008
P. dubium
Near Omine-numa
Minakami
Gunma, 2008
