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This species is the only cuttlefish that is poisonous. Copulation occurs face-to-face, with the male inserting a packet of sperm into a pouch on the underside of the female's mantle. The female then fertilises her eggs with the sperm. The eggs are laid singly and placed by the female in crevices or ledges in coral, rock, or wood. In one instance, around a dozen eggs were found under an overturned coconut half.