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Diagram of a prawn, with the carapace highlighted in red. A carapace is a dorsal (upper) section of the exoskeleton or shell in a number of animal groups, including arthropods, such as crustaceans and arachnids, as well as vertebrates, such as turtles and tortoises. In turtles and tortoises, the underside is called the plastron.
A shed carapace of a lady crab, part of the hard exoskeleton Body structure of a typical crustacean – krill. The body of a crustacean is composed of segments, which are grouped into three regions: the cephalon or head, [5] the pereon or thorax, [6] and the pleon or abdomen. [7]
The decapod (crustaceans such as a crab, lobster, shrimp or prawn) is made up of 20 body segments grouped into two main body parts: the cephalothorax and the pleon . [1] [2] Each segment may possess one pair of appendages, although in various groups these may be reduced or missing. They are, from head to tail:
Studies of the embryonic development in Myodocopida shows that the bivalved carapace develops from two independent buds of the carapace valves. As the two halves grows, they meet in the middle. In Manawa, an ostracod in the order Palaeocopida, the carapace originates as a single element and during growth folds at the midline. [13] [14]
A small crustacean. Carapace ovate, more long than wide; neotype measurements: 25.1 mm × 22.5 mm. [3] Females tends to have larger bodies than males; on the southern coast of Java, the carapace length is 17.6–34.9 mm in females or 18.1–27.7 in males. [4] According to Haig (1974): [5] "Carapace densely covered with sharply serrate ...
The carapace which encloses the branchial chamber has been cut away. The branchial chamber in decapods and some other crustaceans is the area of the body containing the branchiae, or gills . In shrimp-like decapods, water enters the chamber from the edges of the carapace.
Crustaceans may pass through a number of larval and immature stages between hatching from their eggs and reaching their adult form. Each of the stages is separated by a moult , in which the hard exoskeleton is shed to allow the animal to grow.
' ten-footed ') are an order of crustaceans within the class Malacostraca, and includes crabs, lobsters, crayfish, shrimp, and prawns. Most decapods are scavengers . The order is estimated to contain nearly 15,000 extant species in around 2,700 genera, with around 3,300 fossil species. [ 1 ]