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Placocista spinosa
Placocista spinosa

Genus Placocista Leidy, 1879

Diagnosis: shell ovoid, strongly compressed, with acute lateral border; shell edge with or without short, lanceolate spines; shell composed of many small scales; aperture a broad slit, biconvex with pointed edges; nucleus spherical; filopodia.

Two species were found in the Netherlands:

with spines: Placocista spinosa
without spines: Placocista lens

Placocista lens
Placocista lens
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