Family: Body monopodial; locomotion by slight forward bulging (Illustrated Guide, 1985).
Genus: Limax amoebae with hyaline cap reduced to shallow crescent or absent in continuing locomotion, though always seen on initiation of pseudopodium; advance often with non-eruptive slight antero-lateral bulging; villous-bulb uroid with more or less rigid fine villi often present (Page, 1976).
Saccamoeba limax Page, 1967: Slender, 40-75 μm long; villous bulb common; nucleus 5.8-8.6 μm (Page, 1976). 75-100 μm long; pseudopods, lobate; uroid, many short filaments; ectoplasm clear, thick (?), distinct (Illustrated Guide, 1985).
Saccamoeba limna Bovee, 1972: Up to 120 μm; hyaline cap reduced in rapid locomotion; uroidal villi on clear disc or bulb; nucleus 10-15 μm; one contractile vacuole (Page, 1976).