ERTH 2401 Lecture Notes - Lecture 5: Ichthyosaur, Stapes, Iguanodon
Document Summary
Picture: large eye socket deep water habitat. On side of the brain case there are openings for stapes (bones which transmit sound from the tympanic membrane (ear drum) to the brain) On the skull roof: orbit (eye socket) and nares (nostrils) important openings on the skull. The skull is important for classifying dinosaurs into taxonomic order. Drawing of skull: important parts of the skull (don"t need to know all the names just important ones identified later) They share evolutionary novelties and a common ancestor. Amniotic egg (different features of the egg allowed survival and successful reproduction on land) Membrane: amnion retained moisture, keeping embryo bathed in liquid the amnion surrounds the embryo ( sac like) All of these were important for surviving on earth vs living in aqueous environments. By finding eggs, growth rate can be determined. Sketch: amnion surrounding the embryo (different parts of the amniotic egg.