Family: Test round, thick, firm, with rod-like radial structure (Illustrated Guide, 1985).
Genus: Test consisting of a thin, flexible, homogeneous envelope, colorless or translucent, without adherent paticles; pseudostome terminal, elastic; cytoplasm colorless, granular, completely filling the test; nucleus large, placed posteriorly; pseudopodia numerous, long, branching but not anastomosing (Cash & Wailes, 1915). Pseudostome oval, cells clustered (Illustrated Guide, 1985). Species:
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Lecythium hyalinum (Ehrenberg, 1838): Test like Chlamydophrys, 30-40 μm diam., pseudostome round, 15-20 μm; nucleus spherical, 15-20 μm (Illustrated Guide, 1985).