Melon sea Urchin, Echinus melo, is a species of sea urchin in the family Echinidae. This species grows up to 17 cm in diameter. It is spherical or slightly cone-shaped, and the colour of the test is mainly pinkish, yellowish, or greenish-yellow, and banded with white and pale brown, giving it a segmented appearance. The long primary spines are few in number and olive green with pale tips.