New Ross Lab paper in Evolutionary Anthropology!

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We’re excited to congratulate Dr. Yeganeh Sekhavati, Ross Lab alum Dr. Kaleb Sellers, and Dr. Ross on their new paper, “Biomechanics and Evolution of the Primate Tongue”, published this week in Evolutionary Anthropology! This paper explores the primate tongue as a muscular hydrostat with regionally specialized neuromuscular compartments, using anatomical, kinematic, and biomechanical modeling to understand how muscle structure and fiber orientation control complex tongue movements during feeding and vocalization. It also compares species-specific adaptations in macaques and humans, synthesizes recent advances in modeling and experimental studies, and highlights the role of three-dimensional analyses in understanding tongue function across different behavioral contexts.

Congratulations to Dr. Alec Wilken!

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We are so excited to announce Dr. Wilken’s successful defense of his thesis, entitled “The Load Paths in the Jaws of Extant Mammals and Fossil Mammaliaforms and Their Significance for Mammal Jaw and Ear Evolution”. We wish him luck as he moves on to his new job at the University of Missouri!

New paper out of the Ross and Zhe-Xi Luo labs!

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Congratulations to Alec Wilken and Chelsie Snipes for publishing their new paper, “Biomechanics of the mandibular middle ear of the cynodont Thrinaxodon and the evolution of mammal hearing”, along with Dr. Ross and frequent collaborator Zhe-Xi Luo! This paper uses finite element analysis to show that the 250-million-year-old synapsid Thrinaxodon already possessed tympanic hearing similar to modern mammals, relying primarily on a soft-tissue eardrum for airborne sound detection. The results indicate that the functional shift toward a mammalian middle ear—detached from the jaw and specialized for sensitive hearing—occurred very early in mammalian evolutionary history. This paper was covered in UChicago’s Biological Sciences Division newsletter- see the coverage here!

Congratulations to Dr. Kaleb Sellers on his new position!

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Congratulations to Kaleb Sellers, former Ross Lab postdoctoral scholar, for his new position in the Oral Biology department at the University of Illinois: Chicago, where he is now a Clinical Assistant Professor! We are thrilled to continue to have Kaleb nearby, and hope to continue spending time with him and collaborating on projects.

Kaleb Sellers, Alec Wilken, and colleagues publish a new paper in Journal of Anatomy

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Congratulations to Dr. Kaleb Sellers, Alec Wilken, and their colleagues at the University of Missouri on the publication of their new paper, “Quadrate orientation and joint reaction force underwent correlated evolution during suchian evolution”, in the Journal of Anatomy! Using 3D biomechanical modeling of fossils and living crocodylians, the authors show that the orientation of the quadrate bone in the jaw closely matches the orientation of joint reaction forces (JRF) in the sagittal plane. These findings demonstrate that quadrate anatomy evolved in coordination with JRF during suchian evolution, providing a quantitative framework for studying evolutionary changes in jaw joint biomechanics.

Peishu Li, Ross Lab, and collaborators publish tongue base retraction paper

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Congratulations to Dr. Peishu Li and his collaborators within and outside the Ross Lab (including two undergraduate students and one high schooler working with the lab) for publishing a new paper in Integrative and Comparative Biology. The paper compares and contrasts mechanisms of tongue base retraction in macaques, opossums, and dogs to investigate hypotheses of their evolutionary conservation, concluding that the the biomechanics of TBR are functionally diverse and not strictly determined by anatomical variation, allowing for evolutionary flexibility in hyolingual morphology without compromising swallowing performance.

Dr. Yeganeh Sekhavati publishes new hominin foot paper

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Congratulations to Ross Lab postdoc, Yeganeh Sekhavati, for publishing a new paper in the Journal of Human Evolution! The paper examines the evolution of foot morphology in hominins, focusing on changes essential for bipedalism. Dr. Sekhavati and colleagues analyzed 62 foot-related traits and reconstructed ancestral characteristics to trace foot evolution from the last common ancestor of Homo and Pan. The results suggest a Pan-like ancestor, with early adaptations for foot eversion and midtarsal stability preceding other stability features. Additionally, arboreal traits were found in the Paranthropus and Australopithecus clades, indicating evolutionary adaptations from an African ape-like ancestor.