abstract:Rauisuchidae is a group of large (up to 6 meters or more) predatory Triassic archosaurs, and constitute advanced representatives of the larger group Rauisuchia. There is some disagreement over which genera should be included in the Prestosuchidae, which in Rauisuchidae, and which in the Poposauridae, and indeed whether these should even be thought of as separate families.