Turtles, Mammals & Birds. Vertebrate Ancestry Revisited.

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Presentation transcript:

Turtles, Mammals & Birds

Vertebrate Ancestry Revisited

Tetrapoda

Class Amphibia Quadrupedal Controversy surrounding ancestor Lungfish? Lobe-finned Rhipidistian? Coelocanth?

Amphibian Characteristics Webbed feet No claws Moist skin Metamorphosis

Amphibian Taxonomy Class Amphibia Order Gymnophiona Caecilians Order Caudata Salamanders and Newts Order Anura Toads and Frogs

Amniotes

Chorion Gas exchange and blood vessels Amnion Sac enclosing embryo Allantois Gas diffusion and waste excretion Yolk sac Food

Classification of Amniotes Temporal fenestrae

Class Reptilia Order Crocodilia Crocodiles, caimans and alligators Order Rhynchocephalia Tuataras Order Squamata Lizards, snakes and amphisbaenids Order Testudines Turtles

Reptilian Characteristics Ectothermic Scales Oviparous 3-chambered heart Sexual Reproduction

Turtle History Triassic deposits Oldest fossils 210 MY Marine: 120 MY Archelon Largest turtle Cheyenne River, SD Archelon

Order Testudines Characteristics

Turtle Taxonomy Class Reptilia Subclass Anapsida Order Testudines Family Cheloniidae Marine Turtles Family Dermochelyidae Leatherback Turtle

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