Sea Urchins

Sea Urchins – Echinoidea

Sea urchins (Echinoidea) are spiny marine invertebrates belonging to the phylum Echinodermata. With their hard spherical shells (tests) covered in movable spines, they are easily recognized on rocky seabeds and coral reefs worldwide. Sea urchins play an important role in marine ecosystems, grazing on algae and contributing to reef balance. Their varied shapes, colors, and textures make them both ecologically important and visually captivating subjects for underwater photography.