Crabs are decapod crustaceans of the infraorder Brachyura, which typically have a very short projecting "tail" (abdomen), usually hidden entirely under the thorax (brachyura means "short ...
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tail" in Greek[a]). They live in all the world´s oceans, in freshwater, and on land, are generally covered with a thick exoskeleton, and have a single pair of pincers. They first appeared during the Jurassic Period.
^ Sammy De Grave; N. Dean Pentcheff; Shane T. Ahyong; et al. (2009). "A classification of living and fossil genera of decapod crustaceans" (PDF). Raffles Bulletin of Zoology. Suppl. 21: 1–109. Archived from the original (PDF) on 2011-06-06.^ Henry George Liddell; Robert Scott. "βραχύς". A Greek–English Lexicon. Perseus Digital Library. Retrieved 2010-05-24.^ Henry George Liddell; Robert Scott. "οὐρά". A Greek–English Lexicon. Perseus Digital Library. Retrieved 2010-05-24.Cite error: There are tags or {{efn}} templates on this page, but the references will not show without a {{reflist|group=lower-alpha}} template or {{notelist}} template (see the help page).
