INTEGBI N33 Lecture Notes - Lecture 10: Infratemporal Fenestra, Fish Fin, Vertebral Column
31 Mar 2018
School
Department
Course
Professor
Document Summary
Not a lot of free oxygen (a lot of hydrogen, ammonia and water) Has supports in pelvic and pectoral fins that are similar to hands and feet. Pectoral and pelvic fin had long lines of keratin. Lobe-finned fish had supports more like hands and feet. Evolved to get away from predator and to land. Freed amphibians from reproducing in water (moist environment) Embryo surrounded by a hard shell with pores for oxygen exchange. Evolution of body coverings: skin, scales fur, etc. Hole in bottom on cranium; function not sure. Adapted new features in order for new functions. Infratemporal fenestra - allows the passing of jaw muscles to attach to top of skull. Supratemporal fenestra - allows to make room from muscle bulging. 1 of 2 major groups of amniotes, including mammals and their reptile-like ancestors. Hole behind orbit, for jaw muscle attachment. Dominant land animal even though reptiles existed (small and wimpy) Monophyletic group of reptiles with more mammal-like features.
