and Lydekker placed a single family within the suborder, Aëtosauridæ. They considered aetosaurs to be similar to living crocodilians despite their longer metatarsals. 20th century updates Aetosaur material continued to be described into the early 20th century, with notable paleontologists such as Barnum Brown and Charles Camp collecting specimens. Better remains of American aetosaurs helped to establish anatomical info for some common species, such as Desmatosuchus spurensis (described in detail by E.C. Case in 1922) and "Typothorax" meadei (now Longosuchus, described by H.J. Sawin in 1947). However, aetosaur remains were still being confused with those of phytosaurs, and they were still considered to be predominantly carnivorous and semiaquatic "parasuchians" . A.D. Walker's 1961 redescription of Stagonolepis robertsoni helped to divert these notions and established a more modern view of aetosaurian anatomy and ecology. Distribution Aetosaur fossils have been found on all continents except Australia and Antarctica, giving them a nearly worldwide distribution during the Late Triassic. Aetosaur remains are most abundant in northern (Laurasian) continents, and fossils are particularly common in the Chinle Formation and Dockum Group of the southwestern United States. Most fossils have been found in Arizona, New Mexico, and Texas. Some remains have also been found in Wyoming, Colorado, and Utah, particularly in Canyonlands National Park and Zion National Park. Aetosaurs are also known from the Newark Supergroup along the East Coast of the United States, in states such as Connecticut and North Carolina. Aetosaurus and Paratypothorax have been recovered from the Fleming Fjord Formation of Jameson Land, on the east coast of Greenland. These two genera were originally named from the Lower Stubensandstein of Germany. Scotland, Poland, and Italy have also produced aetosaur fossils. A few aetosaurs are known from northern Africa, with scutes having been found from the late Carnian Timesgadiouine Formation in Morocco. During the Late Triassic, Morocco would have been in close proximity with the Newark Supergroup of North America in the supercontinent of Pangaea. It is also possible that Desmatosuchus was present in Africa, as fossils from the Zarzaitine Series in Algeria have been referred to the genus. Aetosaurs are also found in areas corresponding to Gondwana (southern Pangaea), though they are considerably less common or diverse than in Northern continents. South American aetosaurs are known from Argentina, Brazil, and Chile. In Argentina, Aetosauroides and Neoaetosauroides hail from the Carnian Ischigualasto Formation and Norian Los Colorados Formation, respectively. In Brazil, fossils have