Lecture 12 - Dinosaurs and Birds CHALLENGES OF HATCHING...

Info icon This preview shows pages 1–13. Sign up to view the full content.

View Full Document Right Arrow Icon
1 Dinosaurs and Birds CHALLENGES OF HATCHING EGGS ON LAND:
Image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
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)
Image of page 2
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
Image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
4 Triassic Cretaceous
Image of page 4
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)
Image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
6 Sarcosuchus - “Super Croc” 40ft (11.5m) and 9 tons! Hoofed crocodiles! Pristichampsus from the Eocene
Image of page 6
7 Pterosaurs Primarily fish eaters, some insectivorous, some planktivorous?
Image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
8 Wings supported by 4th digit. Wings! A great example of an analogous structure built on a homologous one
Image of page 8
9 PTEROSAUR WALKING Quadrupedal is more likely than bipedal. Orientation of hindlimbs and large head would have made bipedality very difficult. Largest flyer 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
Image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
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
Image of page 10
11 Ornithischia – “bird hips” Hadrosaurs “duck-billed” Ankylosaurs Stegosaurs Ceratopsians “Horned” Pachycephalosaurs “Dome Heads” “Armored”
Image of page 11

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
12
Image of page 12
Image of page 13
This is the end of the preview. Sign up to access the rest of the document.
  • Winter '10
  • MORRIS,M.R./FRISCIA,A.R./MOLDWIN,M.B./VANVALKENBURGH,B
  • Late Cretaceous, Late Triassic, Late Jurassic, Late Cretaceous forms

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern