Evolutionary rates

A new abelisaurid dinosaur from the end Cretaceous of Patagonia and evolutionary rates among the Ceratosauria

Gondwanan dinosaur faunae during the 20 Myr preceding the Cretaceous--Palaeogene (K/Pg) extinction included several line- ages that were absent or poorly represented in Laurasian landmasses. Among these, the South American fossil record contains …