Astropyga Sea Urchins 5" Sold Each. Imagine holding a piece of the ocean's ancient mystery—a striking Astropyga sea urchin, nature's intricate sculpture frozen in time. These remarkable specimens, measuring a full five inches across, showcase delicate geometric perfection that have captivated collectors and ocean enthusiasts for generations. Each urchin tells a story of deep-sea survival, with its distinctive dark coloring and elaborate spine patterns reflecting millions of years of evolution. Perfect for display collections, educational curiosity, or as a conversation-starting gift, these shells connect you to the wonders of marine life. Sourced individually, each piece is unique—a genuine artifact from the ocean's depths, ready to inspire awe in anyone who beholds it.