decapod(redirected from decapodan)
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decapod (dĕkˈəpŏdˌ) (Gr.,=10 feet), name for invertebrate animals of the crustacean order Decapoda (phylum Arthropoda) including the crabs, the lobsters and crayfish, and the true shrimps, all having five pairs of legs. The name Decapoda was also formerly applied to a very different group of animals, a cephalopod order including the cuttlefish and squids, characterized by two long and eight short tentacles. The cuttlefish are now classified in the order Sepiida and the squids in the order Teuthoidea of the class Cephalopoda in the phylum Mollusca.
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1. any crustacean of the mostly marine order Decapoda, having five pairs of walking limbs: includes the crabs, lobsters, shrimps, prawns, and crayfish
2. any cephalopod mollusc of the order Decapoda, having a ring of eight short tentacles and two longer ones: includes the squids and cuttlefish
3. (of any other animal) having ten limbs
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005