Crab-like body plans have evolved independently at least five times. Biologists are still trying to figure out why. Crabs Evolution
. The newborns have long tails, round heads and beady eyes. Typically, once they’re mature, they settle to the seafloor and shapeshift into crab-like forms.however, maintains its juvenile qualities even as an adult, wading through water like a big larval baby.
With bulbous eyes, paddling legs and long predatory mouthparts, “it’s the platypus of the crab world,” says Luque. “And it holds an important key for understanding crab evolution.” Perhaps crabs gain and lose their form so frequently because they can flexibly time when and if to metamorphose. To find out, Wolfe and Luque are shoring up the fragmented fossil record, refining evolutionary trees and identifying adaptive benefits that could favor crabbiness. They’re also leveraging modern tools like high-powered X-rays and genetics. “It’s a complicated story,” Wolfe says. “But that's okay, because that’s evolution.”, but carcinization might not be entirely adaptive.
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