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21 hours ago · Aerosteon. Aetonyx – junior synonym of Massospondylus. Afromimus. Afrovenator. Agathaumas – possible synonym of Triceratops. Aggiosaurus – subsequently found to be a metriorhynchid crocodilian. Agilisaurus. Agnosphitys – possibly non-dinosaurian. Agrosaurus – probably a junior synonym of Thecodontosaurus.