Spider crab

The name spider crab is used to refer to a species of crab in the superfamily Majoidea. See crab spider for spiders of the Thomisidae family.

The Japanese spider crab (Macrocheira kaempferi), is the largest living species of crab, and is found on the bottom on the Pacific ocean.
The Portly spider crab (Libinia emarginata), is a species of crab found in the estuarine areas on the east coast of North America.
Hyas is a genus of spider crabs, and contains the Great spider crab (Hyas araneus) which is found in the Atlantic Ocean, and the North Sea.