The giant hermit crab (Petrochirus diogenes) is a species of marine hermit crab. This species lives in the Caribbean Sea, and often inhabits conch shells. This species of hermit crab is large enough that it can inhabit a fully grown shell of the queen conch. It will attack and eat a conch, thus obtaining a meal and a shell. It was originally described by Carl Linnaeus as Cancer diogenes; the specific epithet honours Diogenes of Sinope.

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