Definition of heart urchin in English:

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heart urchin

noun

A heart-shaped burrowing sea urchin which has a thick covering of fine spines on the shell, giving it a furry appearance.
  • Class Echinoidea, order Spatangoida
Example sentences
  • The sandy patches yield burrowing starfish, rare delicate tube anemones, heart urchins, peacock flounders, and many species of nudibranch and sea hare.
  • Occasionally, unusual events or creatures are seen - massed heart urchins for example, or odd fish such as tadpole fish, red mullet, and even trigger fish.
  • So the heart urchin is considered to be secondarily bilaterally symmetrical.
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