Chimaeras are difficult to place on the tree of life because they're so weird--they're most closely related to sharks, but they also have features of other fishes and even four-legged creatures like mammals. Now, the discovery of a 280-million-year-old fossil from South Africa reveals the evolutionary history of these strange creatures, and sheds light on their early development as they diverged from their deep, shared ancestry with sharks.


Published: January 5, 2017