Sigaretus concavus Lamarck, 1822 (basionym) Sinum concavum, common name the concave ear moon snail, is a species of predatory sea snail, a marine gastropod mollusk in the family Naticidae, the moon snails.

[1] The size of an adult shell varies between 19 mm and 50 mm.

This species is present in the Atlantic Ocean off Senegal, Guinea and Angola.

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