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Cryptodifflugia pusilla
Cryptodifflugia pusilla, each shell 13 µm

Cryptodifflugia pusilla Playfair, 1917

Diagnosis: Shell minute, subquadrate, as broad as high, with broadly rounded fundus, straight sides almost parallel, base full width of shell or nearly so; cross-section circular; membrane smooth, thick, chitinous, structureless, without xenosomes.

Dimensions: Playfair 10 µm; my measurements: 11-13 µm

Cryptodifflugia pusilla
Cryptodifflugia pusilla
Cryptodifflugia pusilla
Cryptodifflugia pusilla
Cryptodifflugia pusilla, all specimens from the Netherlands
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