Also known as Living Fossil, Round-tailed Horseshoe Crab
Found on sand and mud in mangroves and brackish swampy areas.
They feed on bivalves, crabs, small fish, insect larvae and worms.
Length - 40cm
Depth - Shoreline
Widespread Indo-West Pacific
Horseshoe Crabs are considered living fossils, they are invertebrates and are commonly used as bait or turned into fertilizer. They are also caught and the Roe is eaten by locals.
Because they have "Blue Blood" they are widely used for Biomedical Sciences. Ref: https://en.wikipedia.org/wiki/Horseshoe_crab