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Early amniotes (anapsids, mammal-like reptiles and the earliest dinosaurs) Amniota - fosterhinnedjur Amphibia Synapsida (incl. mammals) anapsids Diapsida (incl.dinosaurs) amnion amniote skulls Early amniotes 1) Anapsid reptiles Most primitive skull? – no temporal opening Pareiasauria (Permian, anapsid herbivores) Scutosaurus, Late Permian of Russia 2.4 m long Pareiasauria (Permian, anapsid herbivores) Deltavjatia, Late Permian of Russia Modern Anapsida – turtles and relatives “Early” amniotes – 2) turtles Amphibia Synapsida (incl. mammals) anapsids Diapsida (incl.dinosaurs) amnion Early amniotes: 3) Synapsida Early synapsids a.k.a. Mammal-like reptiles Mammal-like reptiles Mammal-like reptiles Mammal-like reptiles (Synapsida) Synapsid evolution therapsids pelycosaurs Archaeothyris: Carboniferous; one of the oldest synapsids Hylonomus: anapsid Carboniferous; earliest confirmed reptile Pelycosaurs Dicynodonta (Therapsida) Placerias Cynodontia Inostrancevia – a cynodont Permian, Russia The first mammals (A) early Triassic cynodont Thrinaxodon (B) advanced cynodont Probelesodon from the middle Triassic. (C) early mammal Megazostrodon from the early Jurassic Morganucodon • late Triassic • shrew-like • insectivorous • mammaliform reptilian jaw joint Mammal characters - Jaws och auditory ossicles (hörselben) incus (anvil) malleus (hammer) Differentiated teeth Early amniotes: 4) Diapsida • since Carboniferous • but not common until the Triassic Lepidosauria Archosauria Diapsida diapside skull ARCHOSAURIA (ruling lizzards; "Härskarödlor") Triassic-Recent Archosauria “thecodonts” crocodiles dinosaurs birds pterosaurs ARCHOSAURIA Triassic - Recent Archosauria “thecodonts” crocodiles dinosaurs birds pterosaurs “Thecodonts” (“socket-toothed”), Triassic Lagosuchus ARCHOSAURIA Triassic - Recent crocodiles and their relatives: dinosaurs and pterosaurs: crurotarsal ankle joint mesotarsal ankle joint CROCODILIA (Crurotarsi, Crocodylomorpha) (crocodiles; Jurassic - Recent) biggest living reptiles (6 m) Archosauria “thecodonts” crocodiles dinosaurs birds pterosaurs Dinosaur ancestor - Dinosauromorpha Lagosuchus Middle Triassic DINOSAURIA - synapomorphies DINOSAURIA "skräcködlor"; Triassic-Cretaceous .

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