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Evolution of the amniotes

Evolution of the amniotes. Evolution of the amniotes. monophyletic the unifying synapomorphy… the terrestrial environment… truly terrestrial function of membranes? fertilization? development?. Evolution of the amniotes. Skeletal characteristics of early amniotes: palatoquadrate…

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Evolution of the amniotes

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  1. Evolution of the amniotes

  2. Evolution of the amniotes • monophyletic • the unifying synapomorphy… • the terrestrial environment… • truly terrestrial • function of membranes? • fertilization? • development?

  3. Evolution of the amniotes • Skeletal characteristics of early amniotes: • palatoquadrate… • anterior epipterygoid and posterior quadrate • articular bone… • articulates with quadrate • fenestra ovalis… • atlas/axis…

  4. Ancestral anamniote condition gut wall posterior anterior YS embryonic coelom body wall

  5. Initial stage of development developing amniotic folds

  6. Later stage of development ch

  7. Derived amniote condition Derived Amniote Condition

  8. Evolution of the amniotes Diadectomorphs Seymouriamorphs amniotes reptilomorph ancestor

  9. Seymouria…

  10. Diadectomorphs

  11. Evolution of the amniotes synapsids diadectomorphs Seymouria amniotes reptilomorph ancestor

  12. Evolution of the amniotes diapsids anapsids synapsids diadectomorphs Seymouria amniotes reptilomorph ancestor

  13. Diapsids

  14. Diapsids

  15. Diapsids

  16. Diapsids

  17. Diapsids

  18. Diapsids

  19. Anapsids… The Turtles late Triassic… …fully formed 280 species morphologically homogeneous

  20. carapace plastron bridges scutes reduced…

  21. vertebral column and ribs… pectoral girdle and sternum… plastron hinged external and internal nostrils “beak”

  22. ecologically diverse… habitat… trophic relations…

  23. oviparous… burrows… eggs… temperature… predation…

  24. 3 snapper stories…

  25. Loggerhead sea turtles Caretta caretta

  26. green sea turtles

  27. waves…

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