diaspid phylogeny tuatara archosaurs diapsid ancestor lizards snakes

diaspid phylogeny tuatara archosaurs diapsid ancestor lizards snakes lepidosaurs

diaspid phylogeny crocodilians tuatara archosaurs diapsid ancestor lizards snakes lepidosaurs

Crocodylia: alligators, crocodiles, gavials 23 extant species

get the field guide

most derived of the extant “reptiles” four chambered heart lungs (faveoli) diaphragm thecodont teeth well-developed cerebral cortex

external nostrils… hard palate internal nostrils… “nasopharynx” fleshy folds…

large Archosaurs aquatic or semi-terrestrial predaceous

“sit and wait” predators

this is a true story…

males are territorial displays… courtship…

females make nest clears a circular area vegetation and mud central vegetation…

pit… eggs nest covered… conical structure female stays nearby…

nest function? female returns females defend…

babies hatch vocalize female… parental care…

diaspid phylogeny crocodilians pterosaurs tuatara archosaurs diapsid ancestor lizards snakes lepidosaurs

Pteranodon Quetzalcoatlus

Quetzalcoatlus

diaspid phylogeny crocodilians upright posture bipedal locomotion large body size pterosaurs dinosaurs tuatara archosaurs diapsid ancestor lizards snakes lepidosaurs

diaspid phylogeny crocodilians ornithischians saurischians pterosaurs dinosaurs tuatara archosaurs diapsid ancestor lizards snakes lepidosaurs

The Ornithischians… Stegosaurus

Hadrosaurs, the “duckbilled” dinosaurs

Ceratopsians, including Protoceratops

and Triceratops

diaspid phylogeny crocodilians ornithischians saurischians pterosaurs dinosaurs tuatara archosaurs diapsid ancestor lizards snakes lepidosaurs

crocodilians sauropods ornithischians saurischians pterosaurs dinosaurs tuatara archosaurs diapsid ancestor lizards snakes lepidosaurs

Diplodocus

Apatosaurus Gigantothermy…

large SA BV SA/BV small linear dimension of the body large

crocodilians carnosaurs sauropods ornithischians theropods saurischians pterosaurs dinosaurs tuatara archosaurs diapsid ancestor lizards snakes lepidosaurs

Allosaurus

Tyrannosaurus

dromaeosaurs crocodilians carnosaurs sauropods ornithischians theropods saurischians pterosaurs dinosaurs tuatara archosaurs diapsid ancestor lizards snakes lepidosaurs

Utahraptor

Deinonychus

Velociraptor

dromaeosaurs crocodilians Birds! carnosaurs sauropods ornithischians theropods saurischians pterosaurs dinosaurs tuatara archosaurs diapsid ancestor lizards snakes lepidosaurs