Horseshoe Crab

Limulidae is the only recent family of the order Xiphosurida and contains all four living species of horseshoe crabs:
• Carcinoscorpius rotundicauda, the mangrove horseshoe crab, found in Southeast Asia
• Limulus polyphemus, the Atlantic horseshoe crab, found along the northwest Atlantic coast and in the Gulf of Mexico
• Tachypleus gigas, found in South and Southeast Asia