dinosaurs Flashcards
what did dinosaurs evolve from?
archosaurs
what type of eggs did dinos lay?
amniotic
what is amniotic egg
hard shell pourous for gas exchange
aquatic environment inside
yolk sac = food
what stage of growth did amniotic egg eliminate
larval stage - growth of small adult
what were the 2 types of dinousaur
ornithischia
saurischia
hip bones of ornithischian dinosuars
back pointing pubis (bird-hipped)
hip bones of saurischian dinosaurs
forward pointing pubish (reptile-hipped)
bird hipped
ornithischian
reptile hipped
saurischian
example of ornithischian dino
iguanadon
2 sub groups of saurischian
therapod
sauropod
example of therapod
tyrannosaurus
example of sauropod
diplodocus
which dino group did modern birds evolve from
therapod (saurischian)
what was special about walking igunadon dinos
bi-pedal and quad-pedal