Comparative Anatomy and Phylogeny of the Gonads and Gametogenesis, Sex Accessory Structures, and Secondary Sexual Characters of Amphibians and Reptiles
This site emphasizes results and progress from National Science Foundation grant DEB-0809831 "RUI: The Evolution of Sperm Ducts and Accessory Sex Glands in Squamate Reptiles: An Empirical Study of Cellular Complexity" to David M. Sever.
From left to right: Kevin Gribbins (Wittenberg University), Dustin Siegel (St. Louis University), and Justin Rheubert and David Sever (Southeastern Louisiana University) in the Sever Lab at Southeastern, June 2008. Dustin is holding a cottonmouth, Agkistrodon piscivorous.
David Sever with graduate student Justin Rheubert at the Joint Meeting of Ichthyologists and Herpetologists
annual meeting in Portland, Oregon, July 2009, with their poster, "Preliminary Report of Reproductive Morphology of Iguanian Lizards as Displayed by
Phrynosomatidae and Polychrotidae".
David Sever with graduate student Layla Freeborn at the Joint Meeting of Ichthyologists and Herpetologists
annual meeting in Portland, Oregon, July 2009 with their poster, "Reproductive Morphology of Colubroid Snakes".
Symposium: "Reproductive Biology of the Ophidia"
Organized by Robert D. Aldridge (St. Louis University) and David M. Sever
Sponsored by the Herpetologists' League
Joint Meeting of Herpetologists and Herpetologists, Portland, Oregon, 25 July 2009
Robert Aldridge (left) and David Sever
AM Speakers and the Organizers
From left to right: D. Sever, X. Bonnet, S. Trauth, D. Blackburn, T. Ecay, E. Taylor, M. Parker, R. Aldridge, R. Mason
PM Speakers and the Organizers
From left to right: R. Aldridge, D. Sever, N. Ford, K. Gribbins, A. Bronikowski, D. Siegel, S. Graham, Z. Stahlschmidt, B. Jellen,
Edited Volume: Reproductive Biology and Phylogeny of Snakes
Edited by Robert D. Aldridge and David M. Sever
Series Editor: Barrie G.M. Jamieson
Published 2011 by Science Publishers, Inc., Enfield, NH
and CRC Press, Boca Raton, FL; 759 pages
D. M. Sever proposes to standarize nomenclature for squamate testicular ducts
In the first paper from his NSF grant, Sever demonstrates that the testicular ducts in snakes and lizards are homologous to those in other amniotes
Click here to see the Power Point presentation: "Recent Advances in
Our Knowledge of Comparative Cytology of Sex Accessory Organs
in Squamates" given 26 April 2012 at SE LA Univ