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).

100 μm 200 μm 300 μm; x 200 : 50 μm 100 μm 150 μm; x 400

Images of collecting locality: No.2, Ko-numa (pond/marsh), Minakami town (formerly Tsukiyono town), Gunma Pref., Japan, October 12, 2008 by Y. Tsukii