Saccamoeba limax (Dujardin, 1841)
Diagnosis: Locomotive form slender (L/B c. 4.8); villous bulb common; bipyramidal crystals to about 3.5 µm, seldom more than 30 present, sometimes lost after years in culture; endocytic bacteria in known strains; cup-like surface structures c. 40 nm in diameter; mitochondria never elongate.
Dimensions: 35-85 µm; nucleus 6-11 µm.
Ecology: freshwater, several water types.
Difflugia Ovoid Group Key characters: Test in cross section rounded. Test with rounded fundus. Pseudostome with smooth circular edge. Test ovoid. 1 Test with collar
Difflugia – group 1 Test < 60 µm. Test in cross section rounded. Test with rounded fundus. Pseudostome with smooth circular edge. Test not spherical
Difflugia ampla, after Rampi, 1950 (l) and Gauthier-Lièvre et Thomas, 1958 (r) Difflugia ampla Rampi, 1950 Diagnosis: Test broadly pyriform, with a wide and rounded
Difflugia parva, from Gauthier-Lièvre et Thomas, 1958 Difflugia parva (Thomas, 1954) Ogden, 1983 = Difflugia oblonga var. parva Thomas, 1954 Diagnosis: Test pyriform, tapering evenly from