St. Mary's University 1 Camino Santa MariaSan Antonio, TX 78228 +1-210-436-3011 St. Mary's University logo William Joseph Chaminade




  • Ph.D., The University of Texas at Austin, 2006
  • M.S., The University of Texas at Austin, 2000
  • B.A., Washington University in St. Louis, 1997


  • General Biology II
  • Forensic Osteology
  • Comparative Anatomy
  • Anatomy


Thomas E. Macrini, Ph.D., researches the comparative anatomy of fossil and extant mammals, particularly the internal structures of the skull and the sensory structures that these house (e.g., olfactory epithelium, brain, and ear).

Using high-resolution X-ray computed tomography (CT) to non-destructively visualize these internal structures in order to document their anatomy, Macrini is searching for new data that uncovers the evolutionary relationships of mammals and traces the evolution of sensory structures in the fossil record.

In addition to his role as Associate Professor of Biological Sciences, Macrini serves as the chair of the Health Professions Advisory Committee (HPAC), the Joint Admission Medical Program (JAMP) faculty director, the pre-veterinary studies adviser, as a faculty co-adviser for Beta Beta Beta Biological Honors Society, HOSA, and the Pre-Medical Society, and as the faculty adviser for the Biology Living Learning Community. He is also a member on the University Research Council and the Institutional Animal Care and Use Committee.


Macrini, T. E., J. J. Flynn, D. A. Croft, and A. R. Wyss. 2010. Inner ear of a notoungulate placental mammal: anatomical description and examination of potentially phylogenetically informative characters. Journal of Anatomy 216:600-610.

Rowe, T., T. E. Macrini, and Z.-X. Luo. 2011. Fossil evidence on origin of the mammalian brain. Science 332:955-957.

Macrini, T. E. 2012.Comparative morphology of the internal nasal skeleton of adult marsupials based on X-ray computed tomography. Bulletin of the American Museum of Natural History 365:1-91.

Giannini, N. P., T. E. Macrini, J. R. Wible, T. Rowe, and N. B. Simmons. 2012. The internal nasal skeleton of the bat Pteropus lylei K. Andersen, 1908 (Chiroptera: Pteropodidae). Annals of Carnegie Museum 81:1-17.

Macrini, T. E., H. B. Coan, S. M. Levine, T. Lerma, C. D. Saks, D. J. Araujo, T. L. Bredbenner, R. D. Coutts, D. P. Nicolella, and L. M. Havill. 2013. Reproductive status and sex show strong effects on knee OA in a baboon model. Osteoarthritis and Cartilage 21:839-848.

Macrini, T. E., J. J. Flynn, X. Ni, D. A. Croft, and A. R. Wyss. 2013. Comparative study of notoungulate (Placentalia, Mammalia) bony labyrinths and new phylogenetically informative inner ear characters. Journal of Anatomy 223:442-461.

Kirk, E. C., P. Daghighi, T. E. Macrini, B.-A. S. Bhullar, and T. B. Rowe. 2014. Cranial anatomy of the Duchesnean primate Rooneyia viejaensis: new insights from high resolution computed tomography. Journal of Human Evolution 74:82-95.

Macrini, T. E. 2014. Development of the ethmoid in Caluromys philander (Didelphidae, Marsupialia) with a discussion on the homology of the turbinal elements in marsupials. Anatomical Record 297:2007-2017.

Back to top