Assulina seminulum (Ehrenberg, 1848)
Diagnosis: Young shells yellowish, older ones light to dark brown, ovoid, compressed, biconvex in cross-section, with overlapping oval scales; aperture narrow oval, more or less crenulate with organic margin; nucleus vesicular, filopodia.
Dimensions: Length 60-150 µm (several authors, from Hoogenraad and De Groot, 1940)
Remarks: Lüftenegger et al. (2009): Separation between A. seminulum and A. muscorum only by their size, which is in A. seminulum about 1,5 X greater than in A. muscorum (Hoogenraad and De Groot 1937).