Fossils were uncovered in Tanzania and date back to the Anisian stage of the Middle Triassic. It was described in 2010 by a team of researchers from the United States, Germany, and South Africa, in the journal Nature; the type species is A. kongwe. It is the first example of an avian-line radiation during the Anisian, with the diversification of archosaurs during this time previously only documented from crocodylian-line archosaurs. It was the first non-dinosaurian dinosauriform recovered from Africa.[2]
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