1 / 11

Paleozoic Tetrapod Origins/Radiation

Paleozoic Tetrapod Origins/Radiation. rhipidistian crossopterygian ancestry. mid-late Devonian (360-370 mya) major structural changes: limbs/girdles- better support & muscle attachments skull/jaws- new feeding modes vertebrae- better support lungs.

kanoa
Download Presentation

Paleozoic Tetrapod Origins/Radiation

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Paleozoic Tetrapod Origins/Radiation

  2. rhipidistian crossopterygian ancestry • mid-late Devonian (360-370 mya) • major structural changes: • limbs/girdles- better support & muscle attachments • skull/jaws- new feeding modes • vertebrae- better support • lungs

  3. hierarchical classification of the tetrapod vertebrates • Tetrapoda (vertebrates with four limbs) • Amphibia • Lissamphibia (modern amphibians) • Gymnophiona • Caudata (salamanders)- Jurassic ~ 140 mya • Anura (frogs & toads)- Triassic ~ 200 mya

  4. Modern Amphibians: Lissamphibia • general features: • 'amphibious' life cycle (metamorphosis) • smooth, glandular skin • three chambered heart • carnivorous

  5. Order Anura • distribution cosmopolitan except Antarctica; tropics especially • elongate hind limbs & powerful leg muscles • strong pelvis fused to the vertebral column; posterior vertebrae fused into a urostyle • feeding: sticky, protrusible tongue • reproduction: • species specific vocalizations • external fertilization; amplexus

  6. Anuran Anatomy

  7. “protrusible tongue”

  8. Order Caudata • distribution: primarily northern hemisphere • paedogenesis- larvae becomes sexually mature • courtship: species specific displays (visual, tactile, & chemical cues) • internal fertilization; spermatophore transfer • eggs laid in water or moist soil; larvae; aquatic & gilled in many

  9. Salamander Anatomy

  10. A few Oklahoma Amphibians

  11. Amphibians of SE Oklahoma

More Related