decapod

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decapod

(dĕk′ə-pŏd′)
n.
1. Any of various crustaceans of the order Decapoda, characteristically having five pairs of walking legs attached to the thorax and three pairs of maxillipeds used for feeding, and including the crabs, lobsters, and shrimps.
2. Any of various cephalopod mollusks having eight arms and two tentacles, and including the squids and cuttlefishes.

de·cap′o·dan (dĭ-kăp′ə-dən), de·cap′o·dous (-dəs) adj.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

decapod

  1. any crustacean of the largely marine order Decapoda, having five pairs of walking limbs, including the crabs, lobsters, shrimps, prawns and crayfish.
  2. any cephalopod mollusc of the order Decapoda, having a ring of eight short tentacles and two long ones, including the squids and cuttlefish.
Note that this taxonomic name can be applied to two completely different groups of organisms.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005