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Marshall, C. J. and J. K. Liebherr. 1976. Cladistic Biogeography of the Mexican Transition Zone. Journal of Biogeography 27(1): 203-216.

Brown, D. E., P. J. Unmack, T. E. Brennan. 2007. Digitized Map of Biotic Communities for Plotting and Comparing Distributions of North American Animals. The Southwestern Naturalist 52(4): 610-616

The following are the most recent contributions to the herpetological diversity of the Mexican state of Sonora (the latter being the most updated list which includes a newly described species):

Rorabaugh, J. C.. 2008. AN INTRODUCTION TO THE HERPETOFAUNA OF MAINLAND SONORA, MÉXICO, WITH COMMENTS ON CONSERVATION AND MANAGEMENT. Journal of the Arizona-Nevada Academy of Science 40(1):20-65.

Rorabaugh, J. C.. 2008. INTRODUCCIÓN A LA HERPETOFAUNA DE SONORA CONTINENTAL, MÉXICO, CON COMENTARIOS SOBRE CONSERVACIÓN Y MANEJO. Privately published Spanish and nomenclature/taxonomy updated version.

Enderson, E. F., A. Quijada-Mascareñas, D. S. Turner, P. C. Rosen and R. L. Bezy. 2009. Lists of Species: The herpetofauna of Sonora, Mexico, with comparisons to adjoining states. Checklist 5(3): 632-672.

A chapter on herpetofauna will be in the forthcoming limited printing Biodiversidad de Sonora.

The following link is to the website of Erik Enderson, the senior author of the 2009 publication, which lists species of probable occurence in Sonora after the list of the amphibians and reptiles of Sonora with links to some of their images:

http://www.erikenderson.com/herps_sonora.htm