The biggest crab in the world, the Japanese spider crab, is capable of achieving a leg span of more than 13 feet (4 meters) across. Read on to get better acquainted with the Japanese spider crab ...

Far below the ocean's surface, in the dark depths of the deep sea floor ecosystem, exists an entire ... Japanese spider crab (Macrocheira kaempferi) is the biggest crab in the world.

They’re also one of the world’s largest arthropods, animals with no backbone, external skeletons, and multiple-jointed appendages. In this crab’s case, those appendages are its 10 legs.