Lagerpetidae Silesauridae Dinosauria Ornithodira Pseudosuchia ARCHOSAURIA Pterosauria ARCHOSAURIA Antorbital & mandibular fenestrae; Dorsal osteoderms; Air sac system?; Belly-breathing? Nests with vegetation; Parental care of young; Extensive vocal communication; Parasagittal stance?; Flow-through lung? Cervicals distinct from dorsals; Elongate tibiae & metatarsi; Parasagittal stance?; Hinge-like ankle joint; ?loss of bony armor Enlarged calcaneal tuber (”heel”); two rows of dorsal osteoderms Only thin contact between pubis & ischium; Ascending process of astragalus Anterior dentary tooth- less; metacarpal III > 35% of humerus; metatasal V < 50% Elongate pubes & ischia Lagosuchidae Aphanosauria Euparkeria Ornithosuchidae Rauisuchidae Aetosauria Poposauroidea Pseudohesperosuchus Crocodyliformes Dracohors Dinosauromorpha Pterosauromorpha Avemetatarsalia Suchia Paracrocodylomorpha Loricata Crocodylomorpha Phytosauria Archosauriformes Skeletons by Scott Hartman (skeletaldrawing.com), Greg Paul
