GEOL 008 Lecture Notes - Lecture 10: Acanthostega, Pederpes, Lissamphibia
Document Summary
Something must have been around in between (ie transitional fossils ) If transitional fossils exist, they should be in middle late devonian riverbank deposits. They can be expected to have characteristics of lobe finned fish and tetrapods . A blend of fish and tetrapod characteristics a fishapod. Fins with wrist bones to help prop it up in shallow water. Live in water(gills) when young; live on land (lungs or skin) as adults. The amniotic egg , animals no longer need to reproduce in water. Four terms based on the holes in skulls behind the eye ( temporal. Early synapsids (penn to tri) also known as mammal like reptiles. Skull allows for stronger jaws; wider bite. Dimetrodon (early permian) the most famous and recognizable. Temperature control in a cold blooded animal. Enlarged lower jaw with larger jaw muscles. Palate in roof of mouth; can chew and breathe at the same time.
