Trialestes is an extinct genus of Late Triassic (Carnian) crocodylomorphs that lived in South America. It has been classified as a dinosaur in the past due it being adapted as a terrestrial, running carnivore.
The Trialestes genus was an extinct group of crocodylomorphs from the Late Triassic period and inhabited South America.  It was previously considered a dinosaur because it had characteristics that made it a land-dwelling, predatory animal.