Venus nux is a species of saltwater clam. They are marine bivalve molluscs in the family Veneridae, sometimes known as the venus clams.
Venus nux can reach a size of . The shells are globular, with dense, concentric ribs on the surface.
<div align=center> Right and left valve of the same specimen:
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<div align=center> Fossil (Pliocene)
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The species is widespread in the Mediterranean Sea and the Atlantic littorals of Portugal and Spain.