Genus: Usually limax-like, with villous-bulb uroid; locomotion by steady flow with occasional slight antero-lateral bulging; floating form with long, blunt, granular pseudopodia; uninucleate (Page, 1976). Pseudopods do not meld at bases during locomotion; pseudopods not ridged; nucleus spherical (Illustrated Guide, 1985). Species:

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

Trichamoeba villosa Wallich, 1863: Polypodal, 180-250 μm long; monopodal, 250-300 μm long. Uroid, semipermanent, with fine filaments. Ectoplasm, viscous, clear, thin. Endoplasm, grayish, granular; nucleus, round in flat view, 30-45 μm diam., contractile vacuole 40-60 μm (Illustrated Guide, 1985). L/B often 3 (?) (Page, 1976).

Trichamoeba miyakka Bovee, 1972: 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).

Trichamoeba osseosaccus Schaeffer, 1926: 100-150 μm long; relatively slender (?), L/B 2-5; nucleus 13-17 μm (Page, 1976). Bag-like in locomotion with trailing bulge (uroid and filaments), broader at anterior than at posterior (How to know the protozoa, 1979). monopodal 150-180 μm long; uroid a semipermanent disc wifh fine filaments; nucleus spherical 13-17 μm, no endosome; contractile vacuole 15-20 μm diam. (Illustrated Guide, 1985).