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2010-01-27 18:32:12
There are over 5000 species of Crabs in the whole world but only 4500 species are true crabs the other 500 crabs are hermit crabs which are not 'true' crabs. According to The World of Animals. by Walters, Martin & Johnson, Jinny. (Published by Parragon, 2007) 6,793 different species of crabs are known. In addition there are about 850 species of freshwater or semi-terrestrial crabs. 'True' crabs are decapod crustaceans of the infraorder Brachyura, whereas hermit crabs [decapod crustaceans of the superfamily Paguroidea] are classified quite differently due to physical characteristics. They are not even closely related to 'true' crabs. Source: answers.com ANOTHER ARTICLE Some 'not true' crabs are: Hermit, king, porcelain, horseshoe