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What Does 'Crustacean' Mean?

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Akshay Kalbag Profile
Akshay Kalbag answered
A crustacean is a type of aquatic (or water-dwelling) creature which has a shell. This is essentially a skeleton on the outside, and is known as an exoskeleton. 

Scientific Grouping
This class of creatures, whose natural habitat is water, is known as Crustacea. They belong to the phylum Arthropoda, which is a heterogeneous group. 
This is a group of creatures which live mostly in estuaries. Some of the members of the crustacean class include lobsters, shrimps, crabs, barnacles, etc.

Crustaceans as Invertebrates
The bodies of crustaceans are segmented, and they have a hard outer skeleton known as an exoskeleton. In addition, they also have two sets of antennae and one pair of legs in each segment of the body.

Crustaceans and Their Exoskeletons, Limbs and Body Segements

Crustaceans belong to a large class (known as Crustacea), which is comprised of several species of mandibulate arthropods that mostly live in water. 
The exoskeletons of crustaceans are either chitinous or calcareous and chitinous. 
Their limbs are located in every segment of their body, and are both paired and modified into joints. Crustaceans have anything between five and seven pairs of legs.
James Wheeler Profile
James Wheeler answered
A crustacean is an ocean dwelling life form with a hard outer shell that acts as its skeleton.

Examples of Crustaceans
  • Lobsters 

  • King crabs
  • Prawns
  • Shrimp
  • Horseshoe crabs

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