Nucleolaria nucleus, the wrinkled cowry, is a species of sea snail, a cowry, a marine gastropod mollusk in the family Cypraeidae, the cowries.

There is one subspecies: Staphylaea nucleus madagascariensis (Gmelin, 1791) (synonym : Cypraea madagascariensis Gmelin, 1791) (common name: the wrinkled cowrie). This subspecies is distributed in the Indian Ocean along Kenya, Madagascar and Tanzania.

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