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Assulina seminulum
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 X greater than in A. muscorum (Hoogenraad and De Groot 1937).

Assulina seminulum
Assulina seminulum
A. seminulum, Vosges, France
Assulina seminulum
A. seminulum, Tirol, Austria
Assulina seminulum
A. seminulum – Austria, Tirol
Assulina seminulum
A. seminulum, 79 um, Sweden, Store Mose
Assulina seminulum
Assulina seminulum
A. seminulum, Crailoo, the Netherlands (l) and Vosges, France (r)
Assulina seminulum
A. seminulum, after Lueftenegger et al., 1988
Assulina seminulum
A. seminulum, 68 µm, side view, aperture bordered by a thickened rim
Assulina seminulum
A. seminulum, 56 µm, Tirol, Austria
Assulina seminulum
A. seminulum, SEM, from Ogden & Hedley, 1980
Assulina seminulum
A. seminulum, stacked image
Assulina seminulum
A. seminulum, 90 µm
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