This has happened among true crabs, like in a fossil crab called Callichimaera perplexa Its name means " perplexing beautiful chimera" and it lived between 95 million and 90 million years ago, during that Cretaceous Crab Revolution thing.

这发生在真正的螃蟹身上， 比如一只叫做 Callichimaera perplexa 的化石螃蟹， 它的名字意思是“令人困惑的美丽嵌合体” ，它生活在 9500 万到 9000 万年前的白垩纪螃蟹革命期间。