“Reptile” Diversity and Evolution George A. Lozano Department of Biology University of Ottawa Summary
Sauropsids Turtles Diapsids/Saurians Plesiosaurs † and ichthyosaurs † Lepidosaurs Tuatara Squamates (snakes, geckos, iguanas, monitors ) Archosaurs (crocodiles, dinosaurs, pterosaurs ) Dinosaurs
2 George A. Lozano Amniota
Synapsida Sauropsida
Diapsida Turtles
Ancestral amniotes & Turtles Turtles - Testudina
250 species Carapace (vertebrae and ribs) Appendicular girdles INSIDE the shell Beak, no teeth (along with aves) Ear ossicle columella (ind?)
4 George A. Lozano Sauropsida
Diapsida/Sauria Turtles 250
Archosaurs Ichthyosaurs† Lepidosaurs Plesiosaurs† 9.1K 7K Ear ossicle collumella, 3 rd ind. evol.) Lepidosaurs
“scaly” reptiles 6700 species : 4000 lizards, 2700 snakes Tuatara: ancestral diapsid skull Squamata: derived diapsid skull, hemipenes Iguanas Geckos Snakes Skinks Gila monsters, monitor lizards, Komodo dragon
6 George A. Lozano Tuatara
Turtles
Squamates Modified Euryapsid: Aves diapsid Plesiosaur Ichthyosaur
Snakes 8 George A. Lozano Sauropsida
Diapsida Turtles
Archosaurs
Crocodiles Dinosaurs Pterosaurs† Dinosaurs
Ornithischians† Saurischians •Ceratopsids •Duck-billed dino Sauropods† Theropods •Stegosaurus •Ankylosaurus Dinosaurs
Ornithischians† Saurischians •-ceratops (uni, tri…) •Duck-billed dino Sauropods† Theropods •Stegosaurus •Diplodocus •Ankylosaurus •Brachiosaurus
T. rex † Velociraptor † Birds 12 George A. Lozano Sauropod and ornithischian (ankylosaurus)
13 George A. Lozano 14 George A. Lozano Dinosaurs
Ornithischians† Saurischians •Ceratops (uni,tri…) •Duck-billed dino Sauropods† Theropods •Stegosaurus •Diplodocus •Ankylosaurus •Brachiosaurus
T. rex † Velociraptor † Birds 9.1K 16 George A. Lozano 17 George A. Lozano You know what a bird is, but…
Extant dinosaurs Feathers Flight Extensive bone fusion No teeth Long flexible neck Hollow bones Extremely high metabolism
18 George A. Lozano 19 George A. Lozano 20 George A. Lozano Sauropsida
Diapsida Turtles
ArchosaursIchthyosaurs† Lepidosaurs Plesiosaurs†
Crocs Dinos Pterosaurs† Squamata Tuatara 23 2 Ornithischchians† Saurischchians
Sauropods† Theropods
Birds T. rex † Velociraptor † 9.1K Sauropsida Diapsida Archosaurs Dinosaurs Lepidosauria Saurischians Theropods Squamata Turtles (testudina)Turtles Monitor lizzards Monitor Ornithischians Ichthyosauria Velociraptor Plesiosauria Pterosaurus Birds (aves)Birds Sauropods Crocodilia Iguanas Tuatara Geckos Snakes T. rex T. † † † † † † †
Tetrapods Amniotes Sauropsida Diapsida Synapsida Amphibia Archosaurs Dinosaurs Lepidosauria Saurischians Mammalia Theropods Squamata Theria Batrachian Sailback synapsids Turtles (testudina) Monitor lizzards Ornithischians Ichthyosauria Velociraptor Monotremata Plesiosauria Pterosaurus Birds (aves) Sauropods Metatheria Crocodilia Salamader Caecilians Eutheria Iguanas Tuatara Geckos Snakes T. rexT. Frogs † † † † † † † †
© George A. Lozano 24 George A. Lozano