Cellana talcosa, the talc limpet or turtle limpet is a species of true limpet, a marine gastropod mollusc in the family Nacellidae, which is one of the true limpet families. This species is endemic to the Hawaiian islands, where its common name is koele or opihi ko'ele. It is the largest limpet found in the Hawaiian islands and can reach 4 in (100 mm) in diameter.

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