, (meaning "Eagle Lizards") are an Aetosaurs extinct clade of heavily armored, medium to large-sized Late Triassic quadrupedal archosaurs that were mostly herbivorous. Aetosaurs are widely characterized by their dorsal and ventral surfaces being encased in parallel rows of subrectangular osteoderms, some of which sported spikes in some species. Aetosaurs ranged in size from 1–5 meters (3–16 ft), with the average size being between 2.5–3 meters (8–10 ft). Some of the smallest aetosaurs were and Aetosaurus , reaching no more than a meter in length. Aetosaur fossils were first documented by Coahomasuchus paleontologist Louis Agassiz (1807-1873) in 1844, although they were originally attributed armored fish, instead of archosaurs. Two distinct subdivisions of aeotosaurs are currently recognized, the Desmatosuchinae and the Aetosaurinae, based primarily on differences in the morphology of the bony scutes of the two groups. Aetosaurs first appeared during the Late Carnian epoch of the Late Triassic, roughly the same time that phytosaurs and ornithosuchids appeared. From that point on, they quickly diversified, into various genera, with the most notable being , Aetosaurus , and Stagonolepis , and existed for nearly the entirety of the Late Triassic. Aetosaurs quickly became widespread across the the Desmatosuchus supercontinent Pangaea, with their fossils being found in Europe ( Scotland, Germany), India, Northern Africa, North ( United States) and South America ( Argentina), Greenland and Madagascar.
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is an American Paul Sereno paleontologist who is the discoverer of several new dinosaur species on several continents. He has conducted excavations at sites as varied as Inner Mongolia, Argentina, Morocco and Niger. He is a professor at the University of Chicago and a National Geographic "explorer-in-residence." Sereno's most widely publicized discovery is that of a nearly complete specimen of (popularly known as SuperCroc) at Gadoufaoua in the Tenere desert of Niger. Other major discoveries include Sarcosuchus imperator - the oldest known dinosaur fossil, Eoraptor , the first good skull of Jobaria , Carcharodontosaurus iguidensis , Afrovenator and the African Suchomimus pterosaur.
I want to find a " voracious, small-minded predator and name it after the IRS.
— Robert T. Bakker
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