BIOL 2030 Lecture Notes - Lecture 18: Sex Change, Umbilical Cord, Lepidosauria
Document Summary
Lab exam is in lumbers 124 on thursday march 31st. Make sure you check your group number on moodle. Total exam time is 35 minutes; be there 10 minutes early. Class reptilia: share a common ancestor with birds, could call reptilia a clade but lab manual says, superorder: lepidosauria. Order: squamata (lizards/ snakes: in terms of non-avian reptiles, this is the largest group. Order: sphenodonta (tautaras: descendants of an ancient lineage that by and large, are extinct, only two species still surviving; live in new zealand, superorder: archosaurian (crocodiles/ birds/ dinosaurs) Order: testudines (turtles: turtles have a fossil record from over 200 million years ago and they persisted, shell is a modi cation of their skeleton/ bone. Classi cation of amniotes by openings in skull/ cranium. Anapsid: only one opening that is called an orbit (eyes) Mammals developed a second opening on the skull; two openings on either side called a synapsid.
