Fig. 1From: Unappreciated diversification of stem archosaurs during the Middle Triassic predated the dominance of dinosaursArchosauromorph relationships and skulls (in lateral view) exemplifying shape diversity. a Simplified time-calibrated phylogeny showing the main groups of archosauromorphs existing from the late Permian to the Early Jurassic. b The rhynchosaur Bentonyx sidensis. c The proterosuchid Proterosuchus fergusi. d The erythrosuchid Erythrosuchus africanus. e The proterochampsid Gualosuchus reigi Back to article page