Massensterben am Ende der Trias durch Vulkane

The scope of Crurotarsi was changed by a change in the phylogenetic placement of phytosaurs. In 2011, Sterling J. Nesbitt found phytosaurs to be the sister taxon of Archosauria, and therefore not crocodile-line archosaurs. Because phytosaurs are included in the definition of Crurotarsi, crurotarsans are not solely crocodile-line archosaurs but also bird-line archosaurs and phytosaurs. Under this phylogeny, Crurotarsi includes phytosaurs, crocodiles, pterosaurs and dinosaurs, while Pseudosuchia still contains only crocodile-line archosaurs.