Madagascar (including the holotype) and at the Field Museum of Natural History in Chicago, Illinois, including casts of some of the original specimens. Classification Initial attempts Azendohsaurus was first misidentified as an ornithischian dinosaur by Dutuit, based on shared characteristics of its teeth such as the leaf-like shape and the number of denticles. It was later believed to be a sauropodomorph instead by other researchers, assigned to the defunct infraorder "Prosauropoda" (then believed to be a distinct monophyletic group related to sauropods, now known to be a paraphyletic grade) based on the morphology of its lower jaw, maxilla and teeth, such as the downward curving dentary and absence of a predentary bone, one of the characteristic traits of ornithischians. These misidentifications were caused by the convergence in jaw and tooth shape between it and the herbivorous dinosaurs while its true phylogenetic relationships could not be realised due to the absence of other bones of the skull and skeleton. The non-dinosaurian identity of Azendohsaurus was first hinted at after the discovery of additional skeletal material recovered from the type locality. This was based on the presence of traits such as a solid hip socket (acetabulum), and a proximal fourth trochanter on the femur that also lacked an inward-facing head, which are typical of dinosaur skeletons. While evidently not a dinosaur, it was tentatively interpreted as an ornithodiran archosaur, still closely related to dinosaurs. The discovery of more complete material from Madagascar prompted the first formal classification Azendohsaurus as non-dinosaurian by Flynn and colleagues in 2010 through a detailed description of its cranial anatomy and were able to clarify its relationships further. They instead recognised it to be a more basal archosauromorph, far removed dinosaurs and closely related to but outside of the clade of Archosauriformes. As well as the derived, sauropodomorph-like features, the skull also had numerous primitive traits for archosauromorphs, including an open-bottomed lower temporal fenestra, extensive palatal teeth, a pineal foramen and no external mandibular or antorbital fenestrae. However, its exact relationships still remained unknown beyond a position as an indeterminate non-archosauriform archosauromorph. Recognition of Allokotosauria Azendohsaurus was included in a phylogenetic analysis of Triassic archosauromorphs for the first time in 2015 by Nesbitt and colleagues, utilising all of the new information from the skull and skeleton and a broad sample of various Triassic archosauromorph species, where it was recovered as closely related to other enigmatic herbivorous Triassic reptiles