Archosauromorpha
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Archosauromorpha is a clade of diapsid reptiles containing all reptiles more closely related to archosaurs rather than lepidosaurs. Archosauromorphs first appeared during the late Middle Permian or Late Permian, though they became much more common and diverse during the Triassic period.
An interaction between two archosauromorphs: Ornithosuchus ( a member of Archosauriformes) scavenging on Hyperodapedon (a rhynchosaur)
The skeleton of Protorosaurus, one of the oldest archosauromorphs and namesake of the problematic group "Protorosauria"
Champsosaurus, a gharial-like choristodere which survived the Cretaceous-Paleocene extinction event. Choristoderes may represent the fifth group of archosauromorphs, but their origin is obscured.
Rhynchosaur
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Rhynchosaurs are a group of extinct herbivorous Triassic archosauromorph reptiles, belonging to the order Rhynchosauria. Members of the group are distinguished by their triangular skulls and elongated, beak like premaxillary bones. Rhynchosaurs first appeared in the Early Triassic, reaching their broadest abundance and a global distribution during the Carnian stage of the Late Triassic.
Hyperodapedon huxleyi (=Paradapedon)
Skull of Rhynchosaurus articeps
Skull of a rhynchosaur, in Educational Museum Gama D'Eça.