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Round body with two spikes on both sides. The pincers are fit into the body and the tip of the legs are modified into paddles. Aside from swimming, the paddle-shaped legs are used to dig into the sediment or sand to bury itself. They are more active during the night and stays buried under the sand during the day.they feed on a wide variety of foods such as worms, small fish, clams and smaller crustaceans.
The video (speed reduced to 50%) shows how it digs in the sand.