January 2009
World Book Science Dataset;1/1/2009, p1
Reference Entry
Crayfish, or Crawfish, colloquially called crawdad, a freshwater crustacean related to the lobster. (The saltwater spiny lobster is also commonly called crawfish.) It is about six inches (15 cm) long and may be white, red, brown, orange, dark green, or black. The crayfish has two pairs of antennae, one long, the other short. Its cephalotkorax (fused head and thorax) is covered with a rigid shell, or carapace. A pair of large, pincerlike claws and four pairs of walking legs extend from the cephalothorax. The abdomen is made up of six ringlike segments. Four of these segments have short appendages used in swimming.


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