Crabs are decapod crustaceans of the infraorder Brachyura, which typically have a very short projecting tail-like abdomen, usually hidden entirely under the thorax (brachyura means "short 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 on each arm. They first appeared during the Jurassic period, around 200 million years ago.
^De Grave, Sammy; Pentcheff, N. Dean; Ahyong, Shane T.; et al. (September 15, 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 June 6, 2011. Retrieved January 3, 2024.
^Henry George Liddell; Robert Scott. "βραχύς". A Greek–English Lexicon. Perseus Digital Library. Retrieved May 24, 2010.
^Henry George Liddell; Robert Scott. "οὐρά". A Greek–English Lexicon. Perseus Digital Library. Retrieved May 24, 2010.
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Crabs are decapod crustaceans of the infraorder Brachyura, which typically have a very short projecting tail-like abdomen, usually hidden entirely under...
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