horseshoe crab: large marine arthropod of the Atlantic coast of North America having a domed carapace that is shaped like a horseshoe and a stiff pointed tail; a living fossil related to the wood louse
or Alaskan king crab or Japanese crab Marine decapod (Paralithodes camtschatica), an edible crab. It is found in the shallow waters off Japan and along the Alaska coast; it also inhabits the Bering Sea. One of the largest crabs, it often weighs 10 lbs (4.5 kg) or more. Its size and tasty flesh make it a valued food, and large numbers are fished commercially each year