An animal belonging to the echinoid class, which includes sea urchins, sand dollars, and sea cucumbers—spiny marine animals.
From Greek 'echinos' (ἐχῖνος) meaning 'hedgehog' or 'sea urchin,' with the suffix '-id' indicating belonging to a family or class. Applied to this entire group of marine creatures.
Echinoids are incredible survivors—they can regrow lost spines and tube feet, and some species live for over 70 years, making them some of the ocean's most resilient animals!
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