Lecture1VertebratesSlides

Lecture1VertebratesSlides - Vertebrate Systematics...

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1 Vertebrate Systematics (credits: Michael Cramer, Univ. of Notre Dame, Jan. 2009) Phylum Chordata • Several classes of fish, including: – Jawless fishes – Sharks and rays – Bony fish • Class Amphibia (frogs, toads, salamanders) • Three classes of reptiles: – Class Testudines (turtles, tortoises) – Class Lepidosauromorpha (snakes, lizards) – Class Crocodilia (alligators, crocodiles) • Class Aves (birds) • Class Mammalia (mammals) Class Amphibia • Two stage life cycle – Aquatic larvae – Terrestrial adult • Respiratory structures – Gills (larvae) – Lungs (adult) – Skin • Mucous and poison skin glands • Three-chambered heart • Ectothermic • Egg-layers – Must lay eggs in or near water • Major groups – Gymnophiona • Caecilians – Caudata • Salamanders – Anura • Frogs and toads Reptiles • Shelled amniotic egg • Skin hard and brittle • Many have bony plates under scales • Three-chambered heart • Ectothermic • Major groups – Turtles – Crocodilians – Tuatara – Lizards – Snakes
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Lecture1VertebratesSlides - Vertebrate Systematics...

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