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
More 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.
Definition of heart urchin in:
- The US English dictionary