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We found this when walking on the beach during low tide at Sullivan's Island Beach in South Carolina. This is the first time we have every seen one of these.
Echinocardium cordatum lives in a permanent burrow buried about 8 cm deep (to 15 cm) in sandy sediments. The species is found from the intertidal to the subtidal and offshore to about 200 m.
We enjoyed exploring the beach and found all sorts of interesting things.