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Turbo marmoratus

Turbo marmoratus, known as the green turban, the marbled turban or great green turban, is a large species of marine gastropod with a thick calcareous operculum in the family Turbinidae, the turban snails.[1] The shells of these large sea snails have a very thick layer of nacre; this species has been commercially fished as a source of mother of pearl.

Turbo marmoratus  Click to go to Wikipedia