Review and images by bmathison1972; edited by Suspsy
Callichimaera perlexa is an enigmatic crustacean from the Middle Cretaceous. Fossils have been found in the Churuvita Group in Colombia and the Frontier Formation in the United States. C. perlexa evolved during the Cretaceous Crab Revolution, which was a major diversification of ‘true’ crabs during the Cretaceous.