Oldest skeleton of a plesiadapiform provides additional evidence for an exclusively arboreal radiation of stem primates in the Palaeocene

Autor: Stephen G. B. Chester, Thomas E. Williamson, Jonathan I. Bloch, Mary T. Silcox, Eric J. Sargis

Publikováno v: Royal Society Open Science, Vol 4, Iss 5 (2017)

Palaechthonid plesiadapiforms from the Palaeocene of western North America have long been recognized as among the oldest and most primitive euarchontan mammals, a group that includes extant primates, colugos and treeshrews. Despite their relatively s

Externí odkaz: https://doaj.org/article/f0f313313ff94d4bab9110fa88558ba3

Insufficient Evidence for Multiple Species of Tyrannosaurus in the Latest Cretaceous of North America: A Comment on 'The Tyrant Lizard King, Queen and Emperor: Multiple Lines of Morphological and Stratigraphic Evidence Support Subtle Evolution and Probable Speciation Within the North American Genus Tyrannosaurus'

Autor: Thomas D. Carr, James G. Napoli, Stephen L. Brusatte, Thomas R. Holtz, David W. E. Hone, Thomas E. Williamson, Lindsay E. Zanno

Publikováno v: Evolutionary Biology. 49:327-341

The Late Cretaceous dinosaur Tyrannosaurus rex was recently split into three species based on the premise that variation in the T. rex hypodigm is exceptional, indicating cryptic species and “robust” and “gracile” morphs. The morphs are based

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c17510ed7e5b3b72409c6ea8ef858110
https://doi.org/10.1007/s11692-022-09573-1

Petrosal Anatomy of the Paleocene Eutherian Mammal Deltatherium fundaminis (Cope, 1881)

Autor: Thomas E. Williamson, Sarah L. Shelley, Stephen L. Brusatte, Ornella C. Bertrand

Publikováno v: Journal of Mammalian Evolution
Shelley, S, Bertrand, O, Brusatte, S & Williamson, T E 2021, ' Petrosal anatomy of the Paleocene eutherian mammal Deltatherium fundaminis (Cope, 1881) ', Journal of Mammalian Evolution . https://doi.org/10.1007/s10914-021-09568-3

We describe the tympanic anatomy of the petrosal of Deltatherium fundaminis, an enigmatic Paleocene mammal based on cranial specimens recovered from New Mexico, U.S.A. Although the ear region of Deltatherium has previously been described, there has n

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1010205c0c1b353bd74cfa4948c3a72c
https://doi.org/10.1007/s10914-021-09568-3

Brawn before brains in placental mammals after the end-Cretaceous extinction

Autor: Ornella C. Bertrand, Sarah L. Shelley, Thomas E. Williamson, John R. Wible, Stephen G. B. Chester, John J. Flynn, Luke T. Holbrook, Tyler R. Lyson, Jin Meng, Ian M. Miller, Hans P. Püschel, Thierry Smith, Michelle Spaulding, Z. Jack Tseng, Stephen L. Brusatte

Publikováno v: Bertrand, O, Shelley, S, Williamson, T E, Wible, J R, Chester, S G B, Flynn, J J, Holbrook, L T, Lyson, T R, Meng, J, Miller, I M, Puschel Rouliez, H, Smith, T, Spaulding, M, Tseng, Z J & Brusatte, S 2022, ' Brawn before brains in placental mammals after the end-Cretaceous extinction ', Science, vol. 376, no. 6588, pp. 80-85 . https://doi.org/10.1126/science.abl5584
Science

Mammals are the most encephalized vertebrates, with the largest brains relative to body size. Placental mammals have particularly enlarged brains, with expanded neocortices for sensory integration, the origins of which are unclear. We used computed t

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::69b76100debf419261eef6608452f1f7
https://pubmed.ncbi.nlm.nih.gov/35357943

Virtual endocranial and inner ear endocasts of the Paleocene ‘condylarth’ Chriacus : new insight into the neurosensory system and evolution of early placental mammals

Autor: Luke T. Holbrook, Stephen G. B. Chester, John R. Wible, Stephen L. Brusatte, Ian B. Butler, Sarah L. Shelley, Ornella C. Bertrand, Thomas E. Williamson

Publikováno v: Journal of Anatomy
Bertrand, O, Shelley, S L, Wible, J R, Williamson, T E, Holbrook, L T, Chester, S G B, Butler, I & Brusatte, S 2019, ' Virtual endocranial and inner ear endocasts of the Paleocene ‘condylarth’ Chriacus: New insight into the neurosensory system and evolution of early placental mammals ', Journal of Anatomy, vol. 236, no. 1, pp. 21-49 . https://doi.org/10.1111/joa.13084
J Anat

The end‐Cretaceous mass extinction allowed placental mammals to diversify ecologically and taxonomically as they filled ecological niches once occupied by non‐avian dinosaurs and more basal mammals. Little is known, however, about how the neurose

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::11443d00db0625e29aae4562aa5ca805
https://doi.org/10.1111/joa.13084