Mesozoic Ichthyosaur Mesozoic Plesiosaur Mesozoic Pterosaur

Mesozoic Ichthyosaur Mesozoic Plesiosaur Mesozoic Pterosaur

Mesozoic
Ichthyosaur
Mesozoic
Mesozoic
Pterosaur
Plesiosaur
Mesozoic
Mesozoic
Ankylosaur
Stegosaur
1
Stegosaur
Mesozoic
Stegosaur
Mesozoic
Tricerotops
Sauropod
Mesozoic
2
Mesozoic
Sauropod
3
Sauropod
“Hot-blood” Dinosaurs
Ectotherms (≈ “cold-blooded”)
heat from environment
E d th
Endotherms
( “warm-blooded”)
(≈
“
bl d d”)
heat from within, metabolic
Robert Bakker
Gary Larsen Î
Robert Bakker
4
INSULATION
Predator:Prey Ratios
If become endotherms, then ratio should drop.
If endotherms, then insulation.
Pterosaurs
Latitudinal
Distribution
5
Latitudinal
Early
Bone
Distribution
If endotherms, then
LARGE dino’s in
cold latitudes.
Endotherm
Late
Ectotherms
Pre-Dinosaurs-------|--------------- Dinosaurs-----------------------|
Cotylosaur
Turtle
If endotherms, then no
bone rings.
Pareiasaurus
CRITIQUE
Predator:Prey Ratios-----Artifact preservation
Insulation--------------------Debatable
Latitudinal Distribution---Migrate
Bone structure-------------Complicated
structure
Complicated
turbinates
Contrary Evidence
turbinates
6
Lizard
If endotherms,
then turbinates.
[ If ectotherms, then NO
turbinates.]
Dinosaur
If endotherms,
then turbinates.
[ If ectotherms, then NO
turbinates.]
7
Sauropod
Gastroliths
Bipedal
8
9
Cenozoic
Cenozoic
Titanothere
Saber-tooth
10
Cenozoic
Placental
Marsupial
Cenozoic
Cenozoic
11
12