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The king conch, Strombus gigas, found in the warmer waters of the Atlantic, Caribbean, and Gulf of Mexico, has a shell 10 to 12 in. (25-30 cm) long and may weigh up to 5 lb (2.3 kg). Similar in size and distribution is the queen conch, Cassis cameo. Its shell has been used in Europe to carve cameos. Conch shells range in color from white to red; they have been used by humans to fashion a number of items, such as buttons, ornaments, or the crude trumpets made from the shell of the trumpet conch, Charonia tritonis. This conch is similar in shape to the king and queen conchs but is much more slender and reaches a length of 20 in. (50 cm). C. tritonis is found in the Gulf of Mexico and the Indian Ocean. The largest conch and also one of the largest univalves in the world is the horse conch, Pleuroploca gigantea, having a shell length of 24 in. (60 cm).
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