Life in the Mesozoic (cont.) The Age of Dinosaurs.

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Presentation transcript:

Life in the Mesozoic (cont.) The Age of Dinosaurs

Saurischia “Reptile-Hipped Dinosaurs” 1.Sauropods (Herbivores) 2.Theropods (Carnivores) Aves (Birds)

Sauropods Seismosaurus

Sauropods Barapasaurus

Sauropods apatosaurus

Theropods Tyrannosaurus

Velociraptor Theropods

allosaurus Theropods

Small Theropods Compsognathus

How do we know about Dinosaur Behavior?

Dino Nests

Dinosaur Trackways

How do we know about Dinosaur Color and Soft “Stuff”?

Skin Imprints Triceratops

Brain Casts & Gizzard Stones

Color? Ceratosaurus

Warm vs. Cold Blood (Endotherms vs. Ectotherms)

Predator/Prey Ratios

Bone Structure

Upright Posture & Fast Speeds

Problems - Food & Heat Loss

Bottom Line Some dinosaurs were endotherms (small theropods) and others were ectotherms (large sauropods)

Adapting to the Skies

First in Flight - Pennsylvanian Cretaceous dragonfly

Meganeura monyi (roughly to scale) The largest insect in history More to come in the Mesozoic…

Second - The Flying Reptiles Pterosaurs Criorhynchus

Pterosaurs Pteranodon

Pterosaurs: Pterodaustro

Third - First Birds (Aves) Jurassic

archaeopteryx

Share Characteristics with Theropods Deinonychus

Caudipteryx

Feathered Dinosaurs Dilong paradoxus

Last…Mammals (Cenozoic) Bats

Mesozoic Mammals Synapsids (Mammals) Anapsids (Turtles) Diapsids Lizards & Snakes Crocodiles Pterosaurs Marine Reptiles Dinosaurs & Birds Archosaurs

Triassic - Lystrosaurus

Mammals vs. Reptiles 1.Development of jaw and ear bones 2.Secondary palate 3.Teeth differentiate 4.Evidence for warm-blood

Mesozoic Mammal Teeth

Cynodonts (Triassic)

Small Insectivores

Mesozoic Mammals: Bigger than previously thought Repenomamus More with the Cenozoic…