Crustacean

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Crustacean

Crustacean (/krʌˈsteɪ.ʃən/) is a large, diverse group of arthropods, including familiar animals such as crabs, lobsters, crayfish, shrimp, krill, and barnacles. The crustacean group can be treated as a subphylum under the phylum Arthropoda, and thanks to recent molecular studies, it is now well accepted that the crustacean group is paraphyletic, and comprises all animals in the Pancrustacea taxon other than hexapods.

Etymology

The term "crustacean" comes from the Latin crustaceus, which means "having a crust or shell".

Related Terms

  • Arthropods: An invertebrate animal having an exoskeleton, a segmented body, and paired jointed appendages.
  • Crabs: Decapod crustaceans of the infraorder Brachyura, which typically have a very short projecting "tail".
  • Lobsters: Large marine crustaceans with a cylindrical body, muscular tail, and two large claws.
  • Crayfish: Freshwater crustaceans resembling small lobsters, to which they are related.
  • Shrimp: Small, decapod crustaceans found in the sea and in freshwater.
  • Krill: Small crustaceans of the order Euphausiacea, and are found in all the world's oceans.
  • Barnacles: A type of arthropod constituting the infraclass Cirripedia in the subphylum Crustacea.
  • Hexapods: The largest number of species of arthropods and includes the insects as well as three much smaller groups of wingless arthropods.
  • Pancrustacea: A clade, or group, which includes crustaceans and hexapods.

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