Decapoda
Decapoda (de*kap"o*dȧ) , proper noun, plural
[New Latin, from Greek de`ka ten + poy`s, podo`s, foot.]
1.
(Zoology) The order of Crustacea which includes the shrimps, lobsters, crabs, etc.
They have a carapace, covering and uniting the somites of the head and thorax and inclosing a gill chamber on each side, and usually have five (rarely six) pairs of legs. They are divided into two principal groups: Brachyura and Macrura. Some writers recognize a third (Anomura) intermediate between the others.
2.
(Zoology) A division of the dibranchiate cephalopods including the cuttlefishes and squids. See Decacera.