Difference in survival temperature: King crabs, also known as stone crabs or rock crabs, that is, crustaceans of the family Lithopodae, are not real crabs, they are mainly distributed in cold sea areas, and their survival water temperature is 2-5℃. Long-legged crab, also known as Jalas Jiahuang Crab, belongs to the lithoid crab, and its water temperature is 10- 15℃.

Origin difference: King crabs are produced in the cold waters of the North Pacific Ocean, from the Sea of Japan, the Sea of Okhotsk to the Bering Sea. Long-legged crabs are found in cold waters such as the northern Pacific of North America.