 Aetosaur material continued to be described into the early 20th century , with notable paleontologists such as Barnum Brown and Charles Camp collecting specimens . However , aetosaur remains were still being confused with those of phytosaurs . During this time , aetosaurs were usually considered to be members of Pseudosuchia , a now obsolete group consisting of various Triassic archosaurs including phytosaurs . However , similarities were often observed between aetosaurs and Crocodilia , the group to which aetosaurs were initially referred in the 19th century . While the skull had many features in common with pseudosuchians , parts of the postcranial skeleton , in particular the scutes , seemed to be similar to those of crocodilians . 
