A genus of sea urchins (also called sand dollars) with a flattened, shield-shaped body, found in shallow marine environments.
From Latin 'clypeus' (shield) combined with 'aster' (star, from Greek 'aster'), creating a scientific name meaning 'shield-star.' The name describes the creature's flattened, star-like appearance.
Sea urchins have a five-fold radial symmetry that makes them look like stars, and their name literally means 'shield-star'—that's because when you turn one over, you can see the beautiful five-pointed star pattern in their shell structure.
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