DinosShort10

DinosShort10 - Dinosaurs and Birds CHALLENGES OF HATCHING...

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1 Dinosaurs and Birds CHALLENGES OF HATCHING EGGS ON LAND:
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2 EARLY AMNIOTE circa 300 Ma MAMMALS BIRDS DINOSAURS REPTILES BASAL AMNIOTES SYNAPSIDS SAUROPSIDS MAJOR SPLIT WITHIN AMNIOTES OCCURRED IN THE PALEOZOIC EARLY SYNAPSIDS (ancestral to Mammals)
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3 DESCENDANTS OF EARLY SAUROPSIDS TURTLES LIZARDS AND SNAKES CROCODILES BIRDS DINOSAURS Geologic Timescale (and dates to know) Oldest minerals Oldest rocks Oldest life First hard parts “Cambrian Explosion” Paleozoic Mesozoic Cenozoic K/T Extinction P/T Extinction Present
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4 Triassic Cretaceous
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5 Archosaurs – “ruling reptiles” (within sauropsids) • Crocodiles • Birds • Pterosaurs* • Saurischia* • Ornithischia* * = extinct Crocodilians Extant archosaurs (related to extinct dinosaurs) Extant sister group to birds Grew to ENORMOUS sizes in the Mesozoic (school bus sized!) and varied shapes ORIGIN: Cretaceous (146 - 65 MYA)
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6 Sarcosuchus - “Super Croc” 40ft (11.5m) and 9 tons! Hoofed crocodiles! Pristichampsus from the Eocene
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7 Pterosaurs Primarily fsh eaters, some insectivorous, some planktivorous?
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8 Wings supported by 4th digit. Wings! A great example of an analogous structure built on a homologous one
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9 PTEROSAUR WALKING Quadrupedal is more likely than bipedal. Orientation of hindlimbs and large head would have made bipedality very difFcult. Largest ±yer to evolve. Wingspan of 12 meters! QUETZALCOATLUS : late K of Texas. NEMICOLOPTERUS A sparrow-sized pterosaur! Probably didn’t weigh more than a large man
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10 Dinosaurs Saurischia – “lizard hips” vs. Ornithischia – “bird hips” lizards crocs dinos Early Dinosaur: EORAPTOR Late Triassic, S.A. : 1 meter long. Fully erect hindlimb. Cannot be assigned to either of the two major dinosaur orders : Saurischia or Ornithischia
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11 Ornithischia – “bird hips” Hadrosaurs “duck-billed” Ankylosaurs Stegosaurs Ceratopsians “Horned” Pachycephalosaurs “Dome Heads” “Armored”
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DinosShort10 - Dinosaurs and Birds CHALLENGES OF HATCHING...

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