Cos 11 - Class 12 Tuesday, February 19, 2008 11:05 AM...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
Class 12 Tuesday, February 19, 2008 11:05 AM Challenges of hatching eggs on land Early amniot 300 ma Major split within amniotes occurred in the paleozoic Mammals Birds/Dinos/Lizards Amniotes Turtles are special. No one really knows where they came from or when Turtles Lizards and Snakes Birds Crocs Dinos
Background image of page 1

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

View Full DocumentRight Arrow Icon
By the end of Cretaceous world looks more like modern continents Archosaurs- "ruling reptiles" (within sauropsids) Crocodiles Birds Pterosaurs Saurischia Ornithischia extinct Crocodilians Xtant archosaurs (related to extinct dinosaurs) Extant sister group to birds Grew to ENORMOUS sizes in the mesozoic (school bus sized) and vaired shapes Very terrestrial Pterosaurs Flight evolved 3 different times in vertebrates Birds, bats and pterosaurs Each did this completely separate ways Convergence or analogous Really diverse groups Varied in diets, some fish eaters Long snout tends to indicated fish eater Small enough to be insectivorous
Background image of page 2
Planktivorous?--like a flamingo Wings supported by 4th digit Loose 5th digit and use the 4th to support wings Pterosaur Walking Quetzalcoatlus Wingspan of 36 feet Estimated weight 100 lbs max Nemicolopterus Smallest Sparrow sized Dinosaurs Saurishia "lizard hips" v. ornithischia "bird hips" One of the first groups to evolved walking upright Crocs have this sprawled, semi sprawled stnace Dinos had legs completely under their body Eoraptor Late triassic 1meter long Fully erect hindlimb Cannot be assigned to either of the two major dinosaur orders: saurischia or ornithischia Hadrosaurs
Background image of page 3

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

View Full DocumentRight Arrow Icon
"duck-billed" Ceratopsians "horned" Super diverse Pachycephalosaurs "dome heads" Steogaurs "Armored"
Background image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 06/04/2008 for the course GE CLUST 70B taught by Professor Morris during the Spring '07 term at UCLA.

Page1 / 11

Cos 11 - Class 12 Tuesday, February 19, 2008 11:05 AM...

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online