| Noun | 1. | order Decapoda - lobsters; crayfish; crabs; shrimps; prawnsanimal order - the order of animals Malacostraca, subclass Malacostraca - largest subclass of Crustacea including most of the well-known marine, freshwater, and terrestrial crustaceans: crabs; lobsters; shrimps; sow bugs; beach flies decapod, decapod crustacean - crustaceans characteristically having five pairs of locomotor appendages each joined to a segment of the thorax Reptantia, suborder Reptantia - lobsters; crabs family Nephropsidae, Nephropsidae - in some classifications coextensive with the Homaridae family Palinuridae, Palinuridae - spiny lobsters family Paguridae, Paguridae - hermit crabs Natantia, suborder Natantia - shrimp; prawns; etc. |
| 2. | order Decapoda - squids and cuttlefishes animal order - the order of animals Dibranchia, Dibranchiata, subclass Dibranchia, subclass Dibranchiata - comprising all living cephalopods except the family Nautilidae: the orders Octopoda (octopuses) and Decapoda (squids and cuttlefish) decapod - cephalopods having eight short tentacles plus two long ones genus Loligo - squids genus Ommastrephes - a genus of Decapoda genus Architeuthis - giant squid family Sepiidae, Sepiidae - true cuttlefishes family Spirulidae, Spirulidae - coextensive with the genus Spirula; included in the order Belemnoidea in some older classifications |