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A heart-shaped sea urchin with an indentation at the front of the test. The fasciole on the upper side encircles all five petals of the ambulacra and is conspicuous in the living animal. It is characteristically lyre-shaped hence the specific name. About 5cm in length. The only heart urchin likely to be found in muddy sediments.


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© National Museums Northern Ireland and its licensors

Source: Encyclopedia of Marine Life of Britain and Ireland

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