Family: Pseudostome ventral, more or less invaginated (Illustrated Guide, 1985).
Genus: Pseudostome ventral, round, with inturned rim; ventral surface flat (Illustrated Guide, 1985).
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Oopyxis cophostoma Jung, 1942: 60-90 μm long, 35-75 μm wide, 47-60 μm high; test brown, ovoid; pseudostome central, anterior, invaginated 5-15 μm