Genus: Usually limax-like, commonly with villous-bulb uroid; locomotion by steady flow with occasional slight antero-lateral bulging; floating form with long, blunt, mostly granular pseudopodia; normally uninucleate (Page, 1976). Pseudopods do not meld at bases during locomotion; pseudopods not ridged; nucleus spherical (Illustrated Guide, 1985).
Species: Broadly clavate in locomotion, 200-300 μm long. Uroid, a semi-permanent bulb or cup with short lobes. Ectoplasm, clear not distinct from endoplasm. Endoplasm, clear, few granules; nucleus spheroidal, 40-60 μm, sometimes dented, no endosome (Illustrated Guide, 1985).
Generally thicker than T. villosa, L/B 2.5-3 (?) (Page, 1976).

50 μm 100 μm 150 μm; x 400 : 31 μm 63 μm 94 μm; x 640

Trichamoeba, x 400, x 640, Uruguay Nov. 1999, photo by Yuuji Tsukii