Morphology and evolutionary significance of the atlas-axis complex in varanopid synapsids

Acta Palaeontologica Polonica

Volumn 56, Issue 4, 2011, Pages 739-748

  Campione, Nicolás E ^a   Reisz, Robert R ^a  

^a UNIVERSITY OF TORONTO   (Canada)

Author keywords

atlas axis complex; axial skeleton; Middle Permian; Mycterosaurinae; South Africa; Synapsida; Varanodontinae; Varanopidae

Indexed keywords

ANATOMY; CLADISTICS; MORPHOLOGY; PALEONTOLOGY; PALEOZOIC; PERMIAN; REPTILE; SKELETON; TETRAPOD; ULTRASTRUCTURE;

SOUTH AFRICA;

SYNAPSIDA; THERAPSIDA;

EID: 83555171447     PISSN: 05677920     EISSN: 17322421     Source Type: Journal    
DOI: 10.4202/app.2010.0071     Document Type: Review

References (27)

1. Botha-Brink, J. and Modesto, S.P. 2007. A mixed-age classed "pelycosaur" aggregation from South Africa: earliest evidence of parental care in amniotes? Proceedings of the Royal Society B 274: 2829-2834. (Pubitemid 350057936)
2. Botha-Brink, J. and Modesto, S.P. 2009. Anatomy and relationships of the Middle Permian varanopid Heleosaurus scholtzi based on a social aggregation from the Karoo Basin of South Africa. Journal of Vertebrate Paleontology 29: 389-400.
3. Campione, N.E. and Reisz, R.R. 2010. Varanops brevirostris (Eupelyco-sauria: Varanopidae) from the Lower Permian of Texas with discussion of varanopid morphology and interrelationships. Journal of Vertebrate Paleontology 30: 724-746.
4. Carroll, R.L. 1976. Eosuchians and the origin of archosaurs. In: C.S. Churcher (ed.), Athlon: Essays on Palaeontology in Honour of Loris Shano Russell, 58-79. Miscellaneous Publications of the Royal Ontario Museum, Toronto.
5. Case, E.C. and Williston, S.W. 1913. Description of certain collections of bones referred to Sphenacodon Marsh. Permo-Carboniferous Vertebrates from New Mexico. Carnegie Institution of Washington 181: 61-70.
6. Dilkes, D.W. and Reisz, R.R. 1996. First record of a basal synapsid ('mammal-like reptile') in Gondwana. Proceedings of the Royal Society of London B 263: 1165-1170. (Pubitemid 26340728)
7. Evans, D.C., Maddin, H.C., and Reisz, R.R. 2009. A re-evaluation of sphenacodontid synapsid material from the Lower Permian fissue fills near Richards Spur, Oklahoma. Palaeontology 52: 219-227.
8. Godfrey, S.J. and Reisz, R.R. 1991. The vertebral morphology of Gephyro-stegus bohemicus Jaekel 1902, with comments on the atlas-axis complex in primitive tetrapods. Historical Biology 5: 27-36.
9. Laurin, M. 1993. Anatomy and relationships of Haptodus garnettensis, a Pennsylvanian synapsid from Kansas. Journal of Vertebrate Paleontology 13: 200-229.
10. Maddin, H.C., Evans, D.C., and Reisz, R.R. 2006. An Early Permian varanodontine varanopid (Synapsida: Eupelycosauria) from the Richards Spurs locality, Oklahoma. Journal of Vertebrate Paleontology 26: 957-966. (Pubitemid 46062064)
11. Modesto, S., Sidor, C.A., Rubidge, B.S., and Welman, J. 2001. A second varanopseid skull from the Upper Permian of South Africa: implications for Late Permian "pelycosaur" evolution. Lethaia 34: 249-259. (Pubitemid 33102169)
12. R-Development-Core-Team 2010. R: A Language and Environment for Statistical Computing, Version 2.12.0. R Foundation for Statistical Computing, Vienna, Austria.
13. Rasband, W. 2007. ImageJ, Version Version 1.38x. National Institutes of Health, Bethesda, Maryland.
14. Reisz, R.R. and Berman, D.S. 2001. The skull of Mesenosaurus romeri, a small varanopseid (Synapsida: Eupelycosauria) from the Upper Permian of the Mezen River Basin, Northern Russia. Annals of Carnegie Museum 70: 113-132. (Pubitemid 32626277)
15. Reisz, R.R. and Dilkes, D.W. 1992. The taxonomic position of Anningia megalops, a small amniote from the Permian of South Africa. Canadian Journal of Earth Sciences 29: 1605-1608. (Pubitemid 23387467)
16. Reisz, R.R. and Dilkes, D.W. 2003. Archaeovenator hamiltonensis, a new varanopid (Synapsida: Eupelycosauria) from the Upper Carboniferous of Kansas. Canadian Journal of Earth Sciences 40: 667-678. (Pubitemid 36901201)
17. Reisz, R.R. and Laurin, M. 2004. A reevaluation of the enigmatic Permian synapsidWatongiaand of its stratigraphic significance. Canadian Journal of Earth Sciences 41: 377-386. (Pubitemid 38783684)
18. Reisz, R.R. and Modesto, S.P. 2007. Heleosaurus scholtzi from the Permian of South Africa: a varanopid synapsid, not a diapsid reptile. Journal of Vertebrate Paleontology 27: 234-239.
19. Reisz, R.R., Dilkes, D.W., and Berman, D.S. 1998. Anatomy and relationships of Elliotsmithia longiceps Broom, a small synapsid (Eupelyco-sauria: Varanopseidae) from the Late Permian of South Africa. Journal of Vertebrate Paleontology 18: 602-611.
20. Reisz, R.R., Laurin, M., and Marjanovic, D. 2010. Apsisaurus witteri from the Lower Permian of Texas: yet another small varanopid synapsid, not a diapsid. Journal of Vertebrate Paleontology 30: 1628-1631.
21. Reisz, R.R., Scott, D., and van Bendegem, J. 1992. Atlas-axis complex of Secodontosaurus, a sphenacodontid mammal-like reptile (Eupelyco-sauria: Synapsida) from the Lower Permian of Texas. Canadian Journal of Earth Sciences 29: 596-600.
22. Reisz, R.R., Wilson, H., and Scott, D. 1997. Varanopseid synapsid skeleton elements from Richard Spur, a Lower Permian fissure fill near Fort Sill, Oklahoma. Oklahoma Geology Notes 57 (5): 160-170.
23. Romer, A.S. 1956. Osteology of the Reptiles. 772 pp. The University of Chicago Press, Chicago.
24. Romer, A.S. and Price, L.I. 1940. Review of the Pelycosauria. Geological Society of America Special Paper 28: 1-538.
25. Stovall, J.W., Price, L.I., and Romer, A.S. 1966. The postcranial skeleton of the giant Permian pelycosaur Cotylorhynchus romeri. Bulletin of the Museum of Comparative Zoology 135: 1-30.
26. Sumida, S.A., Lombard, R.E., and Berman, D.S. 1992. Morphology of the atlas-axis complex of the late Palaeozoic tetrapod suborders Diadecto-morpha and Seymouriamorpha. Philosophical Transactions of the Royal Society of London, Series B 336: 259-273.
27. Williston, S.W. 1911.American Permian Vertebrates. 145 pp. University of Chicago Press, Chicago.