carapace
Source: Noland, George B. 1983. General Biology, 11th Edition. St. Louis, MO. C. V. Mosby
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carapace Structure formed by posterior and lateral extension of dorsal sclerites of the head in many Crustacea, usually covering and/or fusing with one or more thoracic somites; considered as arising from a fold of head exoskeleton.
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Different types of exoskeletons include shells, carapaces (consisting of calcium compounds or silica) and chitinous exoskeletons.
A true endoskeleton (that is, protective tissue derived from mesoderm) is also present in Echinoderms.
Arachnids have a cephalothorax covered with a carapace-like shield. The abdomen may be segmented or unsegmented. Appendages on the abdomen are absent or modified, for example forming the spinnerets of spiders.
Amphipoda: An group of crustaceans recognized by their laterally compressed bodies, lack of a carapace, and numerous, differently modified legs (Hayward et al., 1996).
 See also: Life, Blood, Species, Environment, Trans
  
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