Animals keep evolving into crabs, and scientists don't know why

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Crabs have evolved at least five separate times, and the process for adopting a crab shape is so popular it even has a name—carcinization.

Not all the species to have undergone carcinization have become crabs in the technical sense. Some have merely become crab-like, adopting their shape and form. Carcinized species can be divided into two main groups: Brachyura, which are true crabs, and Anomura, or false crabs.that species keep trying to emulate it?

So how do these creatures end up so crabby? The process of carcinization involves adopting various crab-like characteristics, Wolfe explained, like a flattened, often round carapace , and a pleon that is folded under the body.Why they do this is another question."We are still not sure," said Wolfe."The pleon being folded under the body makes a smaller target for predators. Perhaps crabs are better able to fit into small places to hide.

It could be assumed that crabs are some sort of ultimate evolutionary form, but the experts say that is not the case.

 

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