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Genus Chlamydophrys Cienkowski, 1876

Diagnosis: test in most species thin, hyaline and colorless, sometimes difficult to observe; test ovoid, longish or broad pyriform. Test rigid, sometimes flexible, in cross-section circular or broad elliptical. Plasma nearly fills the test; usually a distinct zonal differentiation of cytoplasm, from the pseudostome to the posterior end: a number of small vacuoles, a transversal layer of food particles, a transversal layer of brilliant granules and a large vesicular nucleus. Pseudostome often on drawn-out neck, not deformable. Nucleus with a central granular nucleolus or completely granular; division with closed orthomitosis. Filopodia may anastomose, sometimes forming a large network. With some species cysts observed in collapsed tests.

Remarks: all species are small, ca. 55 µm in long. Chlamydophrys-species are hard to distinguish or closely related to Lecythium-species. Based on ample observations I think that Chlamydophrys stercorea might be identical with Lecythium hyalinum.

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