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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.

Genus Meisterfeldia Bobrov, 2016

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

Genus Wailesella Deflandre, 1928

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

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Arcella lobostoma

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Hoogenraadia galeata

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Arcella grospietschi

Arcella grospietschi, after Stepanek, 1963 Arcella grospietschi  Stepanek, 1963 Diagnosis: Shell disc-shaped, yellow-brown, in ventral view with a undulated border, with seven large and seven smaller

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Arcella oyei

Arcella oyei, after Stepanek, 1963 Arcella oyei  Stepanek, 1963 Diagnosis: In dorsal view, the shell is circular, with 10 apparent broken lobes on the surface. In

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