Rhadinosuchus  Rhadinosuchus is an extinct genus of proterochampsian archosauriform reptile from the Late Triassic. It is known only from the type species "Rhadinosuchus gracilis", reposited in Munich, Germany. The fossil includes an incomplete skull and fragments of post-cranial material. Hosffstetter (1955), Kuhn (1966), Reig (1970) and Bonaparte (1971) hypothesized it to be synonymous with "Cerritosaurus", but other characteristics suggest it is closer to "Chanaresuchus" and "Gualosuchus", while it is certainly different from "Proterochampsa" and "Barberenachampsa". The small size indicates it is a young animal, making it hard to classify. The fossil was collected at the Sanga 6 site (part of the Santa Maria Formation), in Santa Maria, Paleorrota, Brazil. It was collected by Friedrich von Huene in 1938. The remains are dated to the Triassic Period. The skull of "Rhadinosuchus" had an estimated length of 11.0 centimeters (4.3 inches), with missing portions reconstructed based on its relative "Chanaresuchus". It was generally very similar to the skulls of "Chanaresuchus" and "Gualosuchus". The premaxilla (a toothed bone at the tip of the snout) was long, low, and slightly downturned, though the tooth row is too poorly preserved to estimate the number of teeth present. The maxilla (a toothed bone at the side of the snout) was also a very elongated bone. The maxilla had a long anterior process (forward branch), a short and tapering ascending process (upwards branch), and a long and tapering horizontal process (rear branch). The surface of the anterior process has a uniquely bulged area, though this may just be a result of damage to the bone. The upper portion of the maxilla abruptly transitions between a vertically-oriented outer surface and a horizontally-oriented upper surface, and this abrupt transition is only otherwise present in "Chanaresuchus" and "Gualosuchus". Between the ascending and horizontal processes, the skull has a large and rectangular hole known as an antorbital fenestra. The lower front corner of this hole has a thin basin (an antorbital fossa) edge by a ridge on both processes.