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In short, we came up with the words “fish” and “crab” before we started understanding the evolutionary history of them.
Fish are all craniates (vertebrates with skulls) that aren’t tetrapods (vertebrates with legs). Fish are an example of a Yes I am old but I saw Kid Rock on stage signature shirt group — what would be a true clade if not for the exclusion of one or more clades that fall within it. Reptiles are similar. They’re the anmiotes (creatures that lay eggs or internally carry a fetus within a distinctive set of membranes that allow said eggs to be laid on land), excluding the mammals and the birds. And sauropsids are the clade that contains the reptiles and birds but not the mammals, who are the only surviving synapsids, both named for the shapes of their skulls.
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What we call crabs comes from two different infraorders of crustaceans, one of Yes I am old but I saw Kid Rock on stage signature shirt contains the true crabs, and the other of which contains spiny lobsters, hermit crabs, king crabs, etc. Horseshoe crabs aren’t even crustaceans and shouldn’t really be considered an example of carcinization, because they are simply too different. Same way that “starfish” (now sea stars) and “cuttlefish” aren’t fish at all but got a super-generic word in the past for “thing we found in the water.”