Genus: Test circular, ovoid or discoid; pseudostome eccentric, circular or ovoidal;
with or without spines (Kudo, 1966).
Species: Pseudostome more or less central;
test variable in shape and size;
diameter 187-325 μm;
with 0-12 spines; opaque or semitransparent; with fine sand-grains or diatom shells
(Cojima, Sudo, Chihara eds., 1995).
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