Figure 5 in New data on the braincase of the aetosaurian archosaur (Reptilia: Diapsida) Stagonolepis robertsoni Agassiz

Figure 5. Alternative hypotheses of phylogenetic relationships of aetosaurians to other major clades of Crurotarsan archosaurs. (A) Currently orthodox hypothesis based on the five most recent numerical cladistic analyses (see Gower & Wilkinson, 1996; Benton, 1999) in which aetosaurians are more distantly related to Crocodylomorpha than are at least some rauisuchians. (B) Currently unorthodox hypothesis forwarded here for further consideration, in which aetosaurians are the major archosaurian clade most closely related to Crocodylomorpha. Sphenosuchia may not be monophyletic (e.g. Clark et al., 2001). Some taxa of uncertain affinity are not shown here including Ornithosuchia and Gracilisuchus stipanicicorum. Labelled nodes: (1) Archosauria (2) crown-group archosaurs = Avesuchia (Benton, 1999) (3) Crurotarsi (4) Suchia (5) Crocodylomorpha.