Decapoda
Decapoda
Decapoda (pronounced: /dɪˈkæpədə/; from the Greek δέκα, deka-, "ten", and πούς, pous, "foot") is a large order of crustaceans within the class Malacostraca, including many familiar groups such as crayfish, crabs, lobsters, prawns, and shrimp.
Etymology
The term "Decapoda" is derived from the Greek words "deka" meaning ten and "poda" meaning foot. This refers to the characteristic feature of the members of this order, which have ten legs.
Anatomy
Decapods have a well-developed carapace that covers the cephalothorax, which is fused with the head. They have five pairs of legs, the first of which is usually modified into pincers. The abdomen is segmented and flexible, with a tail fan at the end.
Classification
Decapoda is divided into three suborders: Dendrobranchiata, Pleocyemata, and Caridea. Dendrobranchiata includes prawns, while Pleocyemata includes crabs, lobsters, and shrimp. Caridea is a suborder of shrimp.
Habitat and Distribution
Decapods are found in all oceans, in fresh water, and on land. They are most diverse in marine habitats, but can be found in nearly every type of aquatic environment.
Related Terms
- Crustacean: A large, diverse group of arthropods that includes crabs, lobsters, shrimps, and barnacles.
- Arthropod: An invertebrate animal having an exoskeleton, a segmented body, and paired jointed appendages.
- Cephalothorax: The fused head and thorax of spiders and crustaceans.
- Carapace: A protective, decorative, or camouflaging shell found on the back of animals such as turtles, armadillos, lobsters, and crabs.
External links
- Medical encyclopedia article on Decapoda
- Wikipedia's article - Decapoda
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