Description Echinocardium cordatum

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test many spines missing


the sea potato heart-shaped urchin clothed in dense mat of furrowed yellowish spines grow tubercles , point backwards. upper surface flattened , there indentation near front. urchin fawn colour tests found on strandline have lost spines , white. during life, spines trap air helps prevent asphyxiation buried urchin. ambulacrum forms broad furrow in star shape extending down sides of test. there 2 series each of 2 rows of tube feet. test reaches 6 9 centimetres in length.








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