The crab shape has evolved so many times that scientists had to come up with a special term for it: carcinization
While it’s probably not in the stars for humans to evolve into crabs, it is something that has happened multiple times in the crustacean family, where a creature may have started out looking like a lobster or a hermit crab and then eventually turning into the low, round, pinchy critters we all know and love. But before we dive into why this is, let’s first define the term “crab.”
“Your eye is perceiving a crab when you see this round, kind of oval shape,” says Jo Wolfe, a research associate at Harvard’s department of organismic and evolutionary biology. “These two meanings of the word get mixed up,” says Gerhard Sholtz, a recently retired crustacean zoologist at the Humboldt-Universität in Berlin. “I would say not every crab is a crab.”
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