People

Stephanie E Pierce

Professor of Organismic and Evolutionary Biology
Curator of Vertebrate Paleontology

Stephanie is a trained paleontologist, anatomist, functional morphologist and evolutionary biomechanist. She completed a BSc degree in palaeontology at the University of Alberta, Canada, which included an honors thesis on the anatomy and evolution of hadrosaurian dinosaurs. Directly following this, Stephanie pursued a MSc degree by research in Systematics and Evolution at the University of Alberta studying the anatomy and evolutionary relationships of extinct marine lizards.  Her love of vertebrate evolution took her to the University of Bristol, UK where she embarked on a palaeobiology PhD degree which focused on assessing the interplay between skull shape variation and biomechanical performance in extant and extinct crocodiles. Following this, Stephanie conducted postdoctoral research at the University of Cambridge, UK and Royal Veterinary College, London, examining and reconstructing the 3D anatomy and locomotion potential of early tetrapods across the water-land transition. Stephanie's research interests are very broad and inspired by the vertebrate fossil record, and tend to focus on the relationship between morphology, function, and ecology across major evolutionary transitions.

Email: spierce@oeb.harvard.edu

Postdoctoral Researchers

Peter Bishop

Research Associate

Originally from Australia, Peter has had a lifelong passion for palaeontology, geology and mathematics. He gained a BAppSc (Hons) in Geosciences from the Queensland University of Technology in 2012, completed his PhD in Evolutionary Biomechanics from Griffith University in 2017, and subsequently held post-doctoral research positions at Griffith University, the University of the Sunshine Coast and the Royal Veterinary College. Over this time he has studied many extinct animals including freshwater crustaceans, fish, stem tetrapods, lizards, early archosaurs and dinosaurs (avian and non-avian). Peter is particularly interested in integrating biomechanics with data from fossils and modern animals, using a rigorous, physics-based approach to examine the adaptive significance of evolutionary changes in the vertebrate skeleton. In his current role, his research focuses on the sprawling-to-erect postural transition that took place in synapsids on the line to mammals, where he is using biomechanical modelling and simulation to understand the anatomical and physical factors that influenced and constrained this transition. Since 2007, Peter has also been part of the Geosciences Program of the Queensland Museum, Brisbane, first as a student volunteer and more recently as an Honorary Research Fellow.

Email: pbishop@fas.harvard.edu

Select Publications:

• Bishop, P.J., Falisse, A., De Groote, F. and Hutchinson, J.R. 2021. Predictive simulations of running gait reveal a critical dynamic role for the tail in bipedal dinosaur locomotion. Science Advances 7: abi7348.

• Bishop, P.J., Wright, M.A, and Pierce, S.E. 2021. Whole-limb scaling of muscle mass and force-generating capacity in amniotes. PeerJ 9: e12574.

• Bishop, P.J. , Cuff, A.R., and Hutchinson, J.R..How to build a dinosaur: musculoskeletal modelling and simulation of locomotor biomechanics in extinct animals. Paleobiology. 47: 1-38. doi: 10.1017/pab/2020.46.

• Bishop, P.J. 2019. Testing the function of dromaeosaurid (Dinosauria, Theropoda) ‘sickle claws’ through musculoskeletal modelling and optimization. PeerJ. 18(1) 7: e7577.

• Bishop, P.J., Hocknull, S.A., Clemente, C.J., Hutchinson, J.R., Farke, A.A., Barrett, R.S. and Lloyd, D.G. 2018. Cancellous bone architecture and theropod dinosaur locomotor biomechanics. Part III – reconstructing posture and locomotor biomechanics in extinct theropods, and its evolution on the line to birds. PeerJ 6: e5777.

• Bishop, P.J., Clemente, C.J., Weems, R.E., Graham, D.F., Lamas, L.P., Hutchinson, J.R., Rubenson, J., Wilson, R.S., Hocknull, S.A., Barrett, R.S. and Lloyd, D.G. 2017. Using step width to compare locomotor biomechanics between extinct, non-avian theropod dinosaurs and modern obligate bipeds. Journal of the Royal Society Interface.14: 20170276.

• Bishop, P.J.  2014. The humerus of Ossinodus pueri, a stem tetrapod from the Carboniferous of Gondwana, and the early evolution of the tetrapod forelimb. Alcheringa. 38: 209-238.

Robert Brocklehurst

Postdoctoral Fellow

Rob is a biomechanist, morphologist and evolutionary biologist, whose broad research interests revolve around the evolution of form and function in vertebrates. Rob was an undergraduate at the University of Cambridge, before gaining a master’s degree in palaeobiology at the University of Bristol. From there, he moved “up north” to the University of Manchester, where he received his PhD. His PhD thesis focused on the mechanics of ventilation in archosaurs (birds, crocodilians and dinosaurs), and combined a range of experimental and computational approaches. Rob joined the Pierce lab to examine the evolution of the mammalian forelimb, and the morphological and functional transitions which occurred during the evolution of Synapsids. Rob’s focus will be on creating musculoskeletal models of the forelimb of extinct and extant taxa, to test changes in muscle function and joint range of motion. However, this project, in collaboration with Ken Angielczyk (Field Museum of Natural History, Chicago), will ultimately combine the digital models with geometric morphometrics and both in vivo & ex vivo experimental data to test the functional and evolutionary implications of anatomical transformations in the mammalian forelimb.

Email: rbrocklehurst@fas.harvard.edu

Select Publications:

• Brocklehurst RJ, Schachner ER, Codd JR, Sellers WI. Respiratory evolution in archosaurs, (in press, Philosophical Transactions of the Royal Society B).

• Brocklehurst RJ, Moritz S, Codd J, Sellers WI, Brainerd EL. 2019 XROMM kinematics of ventilation in wild turkeys (Meleagris gallopavo). J. Exp. Biol. 222. (doi:10.1242/jeb.209783).

• Codd JR, Rose KAR, Tickle PG, Sellers WI, Brocklehurst RJ, Elsey RM, Crossley DA. 2019 A novel accessory respiratory muscle in the American alligator (Alligator mississippiensis). Biol. Lett. 15, 20190354. (doi:10.1098/rsbl.2019.0354).

• Brocklehurst R, Porro L, Herrel A, Adriaens D, Rayfield E. 2019 A digital dissection of two teleost fishes: comparative functional anatomy of the cranial musculoskeletal system in pike (Esox lucius) and eel (Anguilla anguilla). J. Anat. 235, 189–204. (doi:10.1111/joa.13007).

• Püschel TA, Marcé-Nogué J, Kaiser TM, Brocklehurst RJ, Sellers WI. 2018 Analyzing the sclerocarpy adaptations of the Pitheciidae mandible. Am. J. Primatol. 80, e22759. (doi:10.1002/ajp.22759).

Amandine Gillet

Marie Curie Postdoctoral Research Fellow

Amandine is a morphologist and evolutionary biologist with a peculiar interest in marine organisms. She gained her BSc and MSc in Biological Sciences at the University of Liège, Belgium, and conducted her Master’s thesis on the comparative morphology of cephalic cartilage in cephalopods at the Polytechnic University of Catalonia, Spain. After gaining experience in the field as a research assistant for projects studying wild dolphin populations, she came back to Belgium to pursue her PhD at the Laboratory of Functional and Evolutionary Morphology at the University of Liège. Her project focused on understanding how morphological modifications of the backbone of cetaceans are related to their ecology and evolutionary history by combining morphometrics, biomechanics, kinematics and phylogenetic comparative methods. Amandine joined the Pierce lab in order to investigate how repeated invasions of the aquatic realm affected the form and function of the mammalian backbone in collaboration with Katrina Jones (The University of Manchester). This project will involve morphological and biomechanical data on terrestrial, semi-aquatic and fully aquatic extant and extinct mammals in order to clarify the impact of the land-to-water transition on the axial skeleton at a broad comparative level.

Website: Amandine Gillet (amandine-gillet.com)

Email: agillet@fas.harvard.edu

Select Publications:

• Gillet, A., Frédérich, B., Pierce, S.E., Parmentier, E. 2022 Iterative habitat transitions are associated with morphological convergence of the backbone in delphinoids. J Mammal Evol. doi: 10.1007/s10914-022-09615-7

• Gillet A, Frédérich B, Parmentier E. 2019 Divergent evolutionary morphology of the axial skeleton as a potential key innovation in modern cetaceans. Proc. R. Soc. B 286: 20191771. doi : 10.1098/rspb.2019.1771

Tiago Simões

Alexander Agassiz Postdoctoral Fellow

Tiago started his career in his home city (Rio de Janeiro, Brazil), where he obtained his BSc and MSc in Biological Sciences-Zoology at the Federal University of Rio de Janeiro, and began developing research on fossil reptiles at the National Museum of Brazil. He subsequently moved to Canada to pursue his PhD with Dr. Michael Caldwell at the University of Alberta, where he expanded his expertise on the evolution of lizards and snakes. Tiago's research interests include combining data from living and extinct species, as well as morphological and molecular data, to investigate deep time problems in reptile evolution. In recent years, he has revised previous phylogenetic and biogeographic hypotheses into the early evolution of lizards in South America and used high resolution µCT scans of modern lizards to assess the adaptive role of the temporal region of the lizard skull. Recently, he published the largest dataset ever assembled to assess broad-scale reptile relationships, finding the first ever agreement between morphological and molecular hypotheses on the early evolution of lizards. Further, he demonstrated that the major reptile lineages first evolved prior to the greatest mass extinction in the history of complex life— the Permian-Triassic Mass extinction. Currently, Tiago is investigating the impact of the Permian-Triassic Mass extinction on long-term evolutionary patterns in reptiles with Dr. Stephanie Pierce in the Museum of Comparative Zoology, Harvard University.

Email: tsimoes@fas.harvard.edu

Select Publications:

• Garberoglio, F. F., Apesteguía, S., Simões, T. R., Palci, A., Gómez, R. O., Nydam, R. L., Larsson, H. C. E., Lee, M. S. Y. & Caldwell, M. W. (2019). New skulls and skeletons of the Cretaceous legged snake Najash, and the evolution of the modern snake body plan. Science Advances, 5(11), eaax5833. DOI: 10.1126/sciadv.aax5833

• Xing, L., Caldwell, M.W., Chen, R., Nydam, R.L., Palci, A., Simões, T. R., McKellar, R. C., Lee, M. S. Y., Liu, Y., Shi, H., Wang, K., Bai, M. (2018). A mid-Cretaceous embryonic-to-neonate snake in amber from Myanmar. Science Advances 4(7), eaat5042. DOI: 10.1126/sciadv.aat5042.

• Simões, T.R., Caldwell, M.W. , Tałanda, M., Bernardi, M., Palci, A., Vernygora, O., Bernardini, F., Mancini, L. & Nydam, R.L. (2018). The Origin of Squamates Revealed by a Middle Triassic Lizard from the Italian Alps. Nature 557(7707), 706-709. DOI: 10.1038/s41586-018-0093-3.

• Simões, T. R., Caldwell, M. W., Palci, A. & Nydam, R. L. (2017). Giant taxon-character matrices: quality of character constructions remains critical regardless of size. Cladistics, 33(2), 198-219. DOI: 10.1111/cla.12163.

• Simões T.R., Wilner E, Caldwell M.W., Weinschütz L.C., Kellner A.W.A. (2015). A stem acrodontan lizard in the Cretaceous of Brazil revises early lizard evolution in Gondwana. Nature Communications, 6 (8149), DOI: 10.1038/ncomms9149.

Megan Whitney

Postdoctoral Fellow

Meg is a vertebrate paleontologist specializing in paleohistology. Using microanatomical structures in the bones and teeth of fossil vertebrates, she works to uncover aspects of extinct animals’ biology that are otherwise lost in time. Meg gained her B.A. in Biology at Macalester College in St. Paul, MN (2013) under the supervision of Kristina Curry Rogers where her research in the bone histology of a baby sauropod inspired her to pursue a career as a paleontologist. Meg then served as a paleohistology lab technician before heading to the University of Washington to obtain her PhD in Biology (2014-2019). There, she worked with Dr. Christian Sidor, using paleohistology to investigate evolutionary trends in synapsid (mammal-line) fossils. Meg has joined the Pierce lab to continue pursuing questions in paleohistology that focus on terrestriality and the biology of early tetrapods. These projects will involve both modern and fossil osteohistological studies to gain a broader insight into how vertebrate life first occupied land. See Meg’s website to learn more about specific projects, fieldwork, and outreach! https://meganrwhitney.weebly.com/

Email: meganwhitney@fas.harvard.edu

Select Publications:

• Whitney, M. R. and C. A. Sidor. 2019. Histological and developmental insights into the herbivorous dentition of tapinocephalid therapsids. PLoS ONE 14(10):e0223860.

• Whitney, M. R., Y. T. Tse, and C. A. Sidor. 2019. Histological evidence of trauma in tusks of southern African dicynodonts. Palaeontologia africana 53:75—80.

• LeBlanc, A. R. H., K. S. Brink, M. R. Whitney, F. Abdala and R. R. Reisz. 2018. Dental ontogeny in extinct synapsids reveals a complex evolutionary history of the mammalian tooth attachment system. Proceedings of the Royal Society B 285:20181792.

• Wynd, B. M., B. R. Peecook, M. R. Whitney, and C. A. Sidor. 2017. The first occurrence of Cynognathus (Synapsida: Cynodontia) in Tanzania and Zambia, with implications for the age and biostratigraphic correlation of Traissic Strata in southern Pangea. pp. 228-239 in C. A. Sidor and S. J. Nesbitt (eds.), Vertebrate Climatic Evolution in the Triassic Rift Basins of Tanzania and Zambia. Society of Vertebrate Paleontology Memoir 17. Journal of Vertebrate Paleontology 37(6).

• Whitney, M. R., L. Mose, C. A. Sidor. 2016. Odontoma in a 255-Million-Year-Old Mammalian Forerunner. JAMA Oncology 3(7):998—1000..

Graduate Students

Catie Strong

Catie completed her B.Sc. and M.Sc. at the University of Alberta, with her Master’s research (supervised by Dr Michael Caldwell) focussing on skull evolution in burrowing snakes. She is interested in using quantitative techniques to explore the interplay between morphology, function, and macroevolution, particularly regarding how various components of the skeleton evolve during the conquest of land by early tetrapods.

Email: crstrong@g.harvard.edu

Select Publications:

• Strong CRC, Scherz MD, Caldwell MW. 2022. Convergence, divergence, and macroevolutionary constraint as revealed by anatomical network analysis of the squamate skull, with an emphasis on snakes. Scientific Reports 12:14469. https://doi.org/10.1038/s41598-022-18649-z 

• Strong CRC, Scherz MD, Caldwell MW. 2021. Deconstructing the Gestalt: new concepts and tests of homology, as exemplified by a re-conceptualization of "microstomy" in squamates. The Anatomical Record 304(10):2303–2351. https://doi.org/10.1002/ar.24630 

• Strong CRC, Palci A, Caldwell MW. 2021. Insights into skull evolution in fossorial snakes, as revealed by the cranial morphology of Atractaspis irregularis (Serpentes: Colubroidea). Journal of Anatomy 238(1):146–172. https://doi.org/10.1111/joa.13295.

• Strong CRC, Caldwell MW, Konishi T, Palci A. 2020. A new species of longirostrine plioplatecarpine mosasaur (Squamata: Mosasauridae) from the Late Cretaceous of Morocco, with a re-evaluation of the problematic taxon ‘Platecarpus’ ptychodon. Journal of Systematic Palaeontology 18(21):1769–1804. https://doi.org/10.1080/14772019.2020.1818322.

• Strong CRC, Simões TR, Caldwell MW, Doschak MR. 2019. Cranial ontogeny of Thamnophis radix (Serpentes: Colubroidea) with a re-evaluation of current paradigms of snake skull evolution. Royal Society Open Science 6:182228. https://doi.org/10.1098/rsos.182228

Mark Wright

Mark was a Master's student in the Erasmus Mundus Master Program in Evolutionary Biology (MEME), then a Research Assistant in the Pierce lab, and now a PhD candidate. He is interested in the evolution of morphological traits and connecting morphology to function. He is currently investigating the functional consequences of transitional forms during early mammalian evolution, focusing on the locomotory shift from sprawling to parasagittal gaits.

Email: markwright@g.harvard.edu

Gabby Guilhon

CAPES PrInt Joint-PhD Fellowship

Gabby is an anatomist and functional morphologist. She obtained her BSc in Biological Sciences/Zoology at the Federal University of Rio de Janeiro (UFRJ - 2015) and her MSc in Zoology at the National Museum of Brazil (MN/UFRJ - 2017). After two years of experience as a research assistant in the aforementioned institutions, she is now a PhD candidate at Federal University of Minas Gerais (UFMG) and also associated with the Pierce lab to conduct her research (2019 - 2023). Gabby is currently investigating the myology evolution of American marsupials through comparative anatomy, physical and digital dissections.

Email: gabbynevesguilhon@fas.harvard.edu  

Select Publications:

• Astúa, D.; Guilhon, G. Morphology, Form and Function in Didelphidae marsupials. In: American and Australasian Marsupials Book, in press (2022).

• Costa-Pinto, A.; Bovendorp, R.; Bocchiglieri, A.; Caccavo, A.; Almeida, A. K.; Delciellos, A. C.; Malhado, A.; Braga, C.; Loretto, D.; Camara, E.; Menezes, F. H.; Guilhon, G.; Paise, G.; Sobral, G.; Varjão, I. C.; Ferreira, J. V.; Oliveira, L. S.; Geise, L.; Pereira, L. C. M.; Corrêa, M.; Nicola, P. A.; Guedes, P.; Becker, R. G.; Barreto, R. M. F.; Silva, S. S.; Orsini, V.; Ladle, R. Small mammals from the Caatinga: a dataset for the Brazilian semiarid biome. Ecology, in press (2022).

• Guilhon, G.; Braga, C. A. C. ; Milne, N. ; Cerqueira, R. Musculoskeletal anatomy and nomenclature of the mammalian epipubic bones. Journal of Anatomy, 2021. (DOI: doi.org/10.1111/joa.13489)

• Sobral, G.; Guilhon, G.; Gudinho, F.; Siciliano, S.; Fuzessy, L. Dam failure and mammals: a portrait of the scenario prior to Mariana disaster. Brazilian Journal of Mammalogy, v. 90, p. 1-19, 2021.

• Guilhon, G.; Braga, C. A. C.; Oliveira, J. A. Pelage variation and reproduction in the gray short-tailed opossum Monodelphis domestica (Didelphimorphia: Didelphidae). Journal of Mammalogy, v. 100, p. 1364-1373, 2019. (DOI: doi.org/10.1093/jmammal/gyz080)

Undergraduate Researchers

Magdalen Mercado

Magdalen is an undergraduate at Harvard College concentrating in Integrative Biology (’22). She is broadly interested in locomotion and the evolution of mammals, and her thesis project involves a broad comparative analysis of forelimb structures in diverse tetrapods using finite element analysis and geometric morphometrics. Magdalen is being mentored by Dr. Robert Brocklehurst and her research is supported by funding from the Museum of Comparative Zoology.

Email: magdalenmercado@college.harvard.edu

Lab Administrator

Tracy Barbaro

In addition to working with the Pierce Lab, Tracy supports the Davies and Pfister labs in OEB.

Email: tbarbaro@oeb.harvard.edu