The Giant Japanese spider crab can be found in the Pacific Ocean near Japan. The giant spider crab is one of the largest arthropods we know. They have been known to measure 3.7 m from the tip of one outstreached claw to another.
Spider crabs get their name from their likeness to a spider.
Reproduction Giant crabs have separate sexes, like many crustaceans. Sperm of male crabs are held in a case, or spermatophore. Spermatophores are transfered to the female by the first and second abdominal appendages during mating. After fertilization, the female crab carries the eggs attached to the abdominal appendages. A cement is secreted by the egg-carrying setae to bind them to the abdominal appendages.