Aerotitan sudamericanus, from the Upper Cretaceous of the Neuqu�n Basin (Patagonia,
Argentina), is known from a partial jaw fragment which has been interpreted as either an
azhdarchid upper jaw, azhdarchid lower jaw, or thalassodromine upper jaw (as the sister-
group of Alanqa). Here, we compare it in detail to upper and lower jaws of taxa belonging to
all azhdarchoid lineages. It possesses a lateral angle (angle of divergence between
occlusal and apex margins in lateral view) that is too low for an upper jaw of any�…