Wikipedia has this to say about crabby:
crabby, Bardus cancer, is the largest land-living arthropod in the world, and is probably at the limit of how big terrestrial animals with exoskeletons can get under the prevailing conditions. His body is divided into four regions; the cephalic lobe, scaphium saeta, trunk, and opisthosoma. He is a highly apomorphic crab and is known for its ability to troll forums with his strong pincers in order to while away the long hours of the day. He is the only species of the genus Iratis.
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-=- You eat one lousy foot and they call you a cannibal. What a world. -=-