Family Cryptodifflugiidae Jung, 1942

Diagnosis: Surface organic or with attached mineral particles. Aperture terminal or eccentric.

Three genera:

Genus Cryptodifflugia Penard, 1890

Shell smooth, clear, flask- or egg-shaped, circular in cross-section, with adhering foreign particles or smooth surface; nucleus vesicular; cyst in test, by mucous plug.

Cryptodifflugia
Cryptodifflugia
Cryptodifflugia

Genus Wailesella Deflandre, 1928

Shell brown, aperture eccentric. Shells superficially remember Trinema shells.

Wailesella eboracensis

Genus Meisterfeldia Bobrov, 2016

Ovoid shell, which is bilaterally symmetrical and laterally compressed, composed of proteinaceous material without mineral particles; circular subterminal aperture placed on ventrally and obliquely cut apertural end, or it is situated on a well developed or poorly expressed neck inclined ventrally

Meisterfeldia chibisovi
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