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an arched diastema, a gap between the teeth at the front of the snout. When the jaw is closed, two large, curved, dentary (lower jaw) teeth fit into the diastema, which is positioned between the premaxilla and maxilla. Two shallow depressions are on the wall of the diastema to accommodate these teeth. The large dentary teeth of Ornithosuchus and Riojasuchus are placed behind a smaller, procumbent

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