Echinothrix sea urchin
The sea urchin Echinothrix lives hidden inside deep crevices in the coral reefs of Moorea, French Polynesia. This image shows multiple types of venomous spines. The white and black bulbous structure is the entrance to the sea urchin's water vascular system, responsible for their movement.
Photograph taken with an underwater digital camera (Cannon), in 2 meters of water in the coral reefs of French Polynesia, under natural lighting.