Common Piddock (Pholus dactylus)

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Common Piddock

The Common Piddock bores into soft rock or wood, and can reach a length of about 6 inches. The shell is white and very brittle with concentric lines and radiating ridges. This species is known for being bioluminescent, glowing a bluish-green in the dark. Also known as angel-wings, from the appearance of both shells when still joined together.