Pterynotus guesti Harasewych & Jensen, 1979 (basionym) Timbellus guesti, common name : the Guest's murex, is a species of sea snail, a marine gastropod mollusk in the family Muricidae, the murex snails or rock snails.

[1] The size of an adult shell varies between 23 mm and 29 mm.

This species is distributed in the Gulf of Mexico along the Florida Keys.

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