A. seminulum, Vosges, France
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 × greater than in A. muscorum (Hoogenraad and De Groot 1937).
A. seminulum, Vosges, France
A. seminulum, Sjøforsen, Norway, 2023
A. seminulum, Tirol, Austria
A. seminulum – Austria, Tirol
A. seminulum, 79 um, Sweden, Store Mose
A. seminulum, Crailoo, the Netherlands (l) and Vosges, France (r)
A. seminulum, after Lueftenegger et al., 1988
A. seminulum, 68 µm, side view, aperture bordered by a thickened rim
A. seminulum, 56 µm, Tirol, Austria
A. seminulum, SEM, from Ogden & Hedley, 1980
A. seminulum, stacked image
A. seminulum, 90 µm