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Evolution of Tetrapod Vertebrates inferred from fossil record

Explore the evolution of tetrapod vertebrates from ancient labyrinthodonts to crossopterygian fish and jawless placoderms. Key taxa like Eusthenopteron and Acanthostega shed light on this evolutionary journey. Behaviors of ancient species like Ichthyostega and Sclerocephalus are intriguing. Discover the transition from amphibians to reptiles, including mammal-like synapsids and ruling archosaurs. Dive into the rich history of vertebrate evolution!

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Evolution of Tetrapod Vertebrates inferred from fossil record

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  1. Evolution of Tetrapod Vertebrates inferred from fossil record Labyrinthodonts – first tetrapod amphibians  Rhipidistians – crossopterygian lobe-finned fish (Sarcopterygii)  Placoderms – first jawed fishes  Ostracoderms – jawless fishes

  2. Cladogram of key taxa in evolution of tetrapods

  3. Eusthenopteron foordi (Sarcopterygii: Crossopterygii) Devonian Quebec

  4. Panderichthys rhombolepis (Sarcopterygi: Crossopterygii) Devonian Latvia

  5. Tiktaalik rosseae Sarcopterygian Fish Devonian 375 MY

  6. Labyrinthodont amphibians - the earliest tetrapods Carboniferous Acanthostega Ichthyostega

  7. Acanthostega Labyrinthodont Amphibian Acanthostega Labyrinthodont Amphibian

  8. facweb.furman.edu

  9. Eusthenopteron and Acanthostega classical reconstruction

  10. Behavior of fossil species can be difficult to interpret Frogfishes (Antennarius) have limb-like fins but they never leave the water …

  11. Periophthalmus …but mudskippers do, and they don’t even have lungs

  12. Sarcopterygians do have lungs African lungfishes caught in small water-hole Sarcopterygians, do have lungs African lungfishes cuaght in small water-hole

  13. Ichthyostega – a temnospondyl labyrinthodont

  14. Ichthyostega – a temnospondyl labyrinthodont ...had 7 toes!

  15. facweb.furman.edu

  16. Sclerocephalus - a temnospondyl labyrinthodont

  17. Eryops – a temnospondyl labyrinthodont

  18. fin-foot intermediates

  19. Eusthenopteron Panderichthys Tiktaalik Acanthostega CA Boisvert et al.Nature (2008) doi:10.1038/nature07339

  20. Evolution of Reptiles from Amphibians inferred from fossil record Anthracosaur Labyrinthodonts –tetrapod amphibians Synapsids – mammal-like reptiles Diapsids – Lepidosaurs (lizards, snakes) and Archosaurs (“ruling reptiles” dinosaurs, crocodiles, birds)    Cotylosaurs (Anapsids ) – stem reptiles 

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