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

3. Cladogram of key taxa in evolution of tetrapods

4. Eusthenopteron foordi (Sarcopterygii: Crossopterygii) Devonian Quebec

6. Panderichthys rhombolepis (Sarcopterygi: Crossopterygii)
Devonian Latvia

7. Tiktaalik rosseae
Sarcopterygian Fish
Devonian 375 MY

8. Labyrinthodont amphibians - the earliest tetrapods Carboniferous
Acanthostega
Ichthyostega

9. Acanthostega
Labyrinthodont Amphibian
Acanthostega
Labyrinthodont Amphibian

10. facweb.furman.edu

11. Eusthenopteron and Acanthostega
classical reconstruction

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

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

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

15. Ichthyostega – a temnospondyl labyrinthodont

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

17. facweb.furman.edu

18. Sclerocephalus - a temnospondyl labyrinthodont

19. Eryops – a temnospondyl labyrinthodont

21. fin-foot intermediates

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

24. 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 