虾与蟹都是十足目(Decapoda)甲壳动物。这个目分为2亚目,即游泳亚目(Natantia)和爬行亚目(Reptantia)。所谓“虾”,指的是全部游泳亚目以及爬行亚目中的长尾类(Macrura)。至于爬行亚目的其余类群,即异尾类(Anomura)和短尾类(Brachyura),即是所谓“蟹”。异尾类通称寄居蟹(anomura crabs),共约1300种;而短尾类才是真蟹(true crabs),共约4500种,二者合计接近6000种。这许多种蟹千奇百态,绝大多数都可食用。但个 Shrimp and crab are decapoda crustaceans. The subfamilies are subfamily 2, Natantia and Reptantia. The so-called “shrimp” refers to all the suborder swimming and reptile suborder Macrura. As for the rest of the taxa, Anomura and Brachyura, the so-called “crabs.” Isoforms, commonly known as anomura crabs, are found in about 1300 species, while the short-tailed species are true crabs with about 4,500 species, which together make up nearly 6,000 species. Many kinds of crabs are so mixed that most are edible. But one