Frenzelina minima Hoogenraad, 1910
Diagnosis: test membranous, hemispherical or nearly spherical, with an more or less open ventral face; very small mineral grains attached to the membrane; test in dorsal view usually elliptical; plasmabody broad-elliptical or more or less kidney-shaped; fine filopodia; nucleus vesicular with central nucleolus.
Dimensions: test 17-26 µm; body 12-17 µm.
Ecology: between waterplants, in Sphagnum and on debris; the Netherlands.
Difflugia Group 1 Key characters: Test < 60 µm. Test in cross section rounded. Test with rounded fundus. Pseudostome with smooth circular edge. Test not
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