Strongylocentrotus franciscanus, red creature which belongs to marine invertebrate group is made up of 10 fused plates with holes through which tubed feet is extended. Red Sea Urchins feed on the Seaweeds and kelp through which it plays an important role on biodegradation. They depend on their long spines to deter predators.
Most of them where with the poisonous spines which can harm the humans. Harmless sea urchins which appears in green and violet color were found mostly in cooler waters. Poisonous variety is common in South Florida. The life span were approximately over 100 years. Sea urchins respond to light through the light sensitive cells present in their spines.