Anatomical notes and discussion of the first described aetosaur Stagonolepis robertsoni (Archosauria: Suchia) from the Upper Triassic of Europe, and the use of plesiomorphies in aetosaur biochronology
Stagonolepis robertsoni, from the Late Triassic of Scotland, was the first named aetosaurian.Known mostly from a series of natural molds from two localities, the osteology of this taxon has been difficult to interpret.Detailed work on this material in the late 1950s resulted in a monograph that set the standard for the understanding of aetosaurians