Biology 680 Major Groups of Vertebrates 2009 - Pelycosauria Dr. Stuart S. Sumida

1. Biology 680 Major Groups of Vertebrates 2009 - Pelycosauria Dr. Stuart S. Sumida The Close Relatives of Pelycosaurs

2. Advanced Amphibian: e.g. Seymouriamorpha Seymouria sanjuanensis

3. Seymouriamorphs are amphibians: Retain an intertemporal bone (amniotes have lost them)

7. Diadectes

8. Orobates pabsti (Diadectomorph)

9. Orobates pabsti (Diadectomorph) 1 cm

10. Diadectomorpha: • No intertemporal bone like other amniotes • Feature of first and second vertebrae • Very terrestrially adapted

11. Diadectomorpha: • No intertemporal bone like other amniotes • Feature of first and second vertebrae • Very terrestrially adapted

12. Diadectomorpha: • No intertemporal bone like other amniotes • Feature of first and second vertebrae • Very terrestrially adapted

14. PARAREPTILIA Includes: • Mesosauria • Bolosauridae • Procolophonia • Paraiesauria

15. Mesosaurus: A member of Mesosauria

18. Eudibamus reconstruction

19. Bradysaurus: A member of the Parieasauria

20. Parieasaurs have lumpy, bumpy skulls Scutosaurus

22. Basal Captorhinid: Eocaptorhinus

26. Development of Large Size in Captorhinidae At least twice.

27. 1 cm New taxon: (Albright, in prep) New, miniature, captorhinid with three rows of dentary and maxillary teeth.

28. 1 cm

29. Size Range in Captorhinid Reptiles (All specimens collected by Everett C. Olson.) 1 cm New taxon

31. Basal Synapsida (“Pelycosauria”): A single opening on side of skull

33. an – angular art – articular bps – basiparasphenoid ca – anterior coranoid co - coranoid d – dentary ec – ectopterygoid eo - exoccipital f – frontal j – jugal l - lacrimal m - maxilla n – nasal p – parietal pal - palatine pf – postfrontal pm – premaxilla p - postparietal pra - prearticular prf – prefontal pt - pterygoid q – quadrate qj - quadratojugal sa – surangular sm – septomaxilla so – supraoccipital sp - splenial sq – squamosal sta – stapes v - vomer Eothyridid pleycosaurs Oedaleops Eothyris

34. an – angular art – articular bps – basiparasphenoid ca – anterior coranoid co - coranoid d – dentary ec – ectopterygoid eo - exoccipital f – frontal j – jugal l - lacrimal m - maxilla n – nasal p – parietal pal - palatine pf – postfrontal pm – premaxilla p - postparietal pra - prearticular prf – prefontal pt - pterygoid q – quadrate qj - quadratojugal sa – surangular sm – septomaxilla so – supraoccipital sp - splenial sq – squamosal sta – stapes v - vomer Haptodus

37. an – angular art – articular bps – basiparasphenoid ca – anterior coranoid co - coranoid d – dentary ec – ectopterygoid eo - exoccipital f – frontal j – jugal l - lacrimal m - maxilla n – nasal p – parietal pal - palatine pf – postfrontal pm – premaxilla p - postparietal pra - prearticular prf – prefontal pt - pterygoid q – quadrate qj - quadratojugal sa – surangular sm – septomaxilla so – supraoccipital sp - splenial sq – squamosal sta – stapes v - vomer Dimetrodon

38. an – angular art – articular bps – basiparasphenoid ca – anterior coranoid co - coranoid d – dentary ec – ectopterygoid eo - exoccipital f – frontal j – jugal l - lacrimal m - maxilla n – nasal p – parietal pal - palatine pf – postfrontal pm – premaxilla p - postparietal pra - prearticular prf – prefontal pt - pterygoid q – quadrate qj - quadratojugal sa – surangular sm – septomaxilla so – supraoccipital sp - splenial sq – squamosal sta – stapes v - vomer