Results 21 to 30 of about 540 (131)

Femoral specializations to locomotor habits in early archosauriforms

Journal of Anatomy, Volume 240, Issue 5, Page 867-892, May 2022., 2022
We studied femoral shape variation by applying 3D geometric morphometrics to a large sample of archosauriforms predominantly from the Late Triassic. We identified a set of anatomical features varying with locomotor mode (quadrupedal/bipedal) or body size.
Romain Pintore, Alexandra Houssaye, Sterling J. Nesbitt, John R. Hutchinson   +3 more
wiley   +1 more source

Was dinosaurian physiology inherited by birds? Reconciling slow growth in archaeopteryx. [PDF]

PLoS ONE, 2009
Archaeopteryx is the oldest and most primitive known bird (Avialae). It is believed that the growth and energetic physiology of basalmost birds such as Archaeopteryx were inherited in their entirety from non-avialan dinosaurs.
Gregory M Erickson, Oliver W M Rauhut, Zhonghe Zhou, Alan H Turner, Brian D Inouye, Dongyu Hu, Mark A Norell   +6 more
doaj   +1 more source

Relative skull size evolution in Mesozoic archosauromorphs: potential drivers and morphological uniqueness of erythrosuchid archosauriforms

Palaeontology, Volume 65, Issue 3, May/June 2022., 2022
Abstract Little is known about the large‐scale evolutionary patterns of skull size relative to body size, and the possible drivers behind these patterns, in Archosauromorpha. For example, the large skulls of erythrosuchids, a group of non‐archosaurian archosauromorphs from the Early and Middle Triassic, and of theropod dinosaurs are regarded as ...
Jordan Bestwick, Pedro L. Godoy, Susannah C. R. Maidment, Martín D. Ezcurra, Mia Wroe, Thomas J. Raven, Joseph A. Bonsor, Richard J. Butler, Kenneth Angielczyk   +8 more
wiley   +1 more source

Upper Cretaceous European theropod palaeobiodiversity, palaeobiogeography and the intra‐Maastrichtian faunal turnover: new contributions from the Iberian fossil site of Laño

Papers in Palaeontology, Volume 8, Issue 1, January/February 2022., 2022
Abstract A total of 227 theropod teeth have so far been recovered from the upper Campanian Laño site (northern Iberian Peninsula). The teeth were studied for their qualitative and quantitative features. From the theropod sample found at Laño, seven morphotypes attributed to five taxa are identified: a medium to large abelisaurid (Arcovenator sp.) and ...
Erik Isasmendi, Angelica Torices, José Ignacio Canudo, Philip J. Currie, Xabier Pereda‐Suberbiola, David Button   +5 more
wiley   +1 more source

The diet of early birds based on modern and fossil evidence and a new framework for its reconstruction

Biological Reviews, Volume 96, Issue 5, Page 2058-2112, October 2021., 2021
ABSTRACT Birds are some of the most diverse organisms on Earth, with species inhabiting a wide variety of niches across every major biome. As such, birds are vital to our understanding of modern ecosystems. Unfortunately, our understanding of the evolutionary history of modern ecosystems is hampered by knowledge gaps in the origin of modern bird ...
Case Vincent Miller, Michael Pittman
wiley   +1 more source

Morphology of the temporal skull region in tetrapods: research history, functional explanations, and a new comprehensive classification scheme

Biological Reviews, Volume 96, Issue 5, Page 2229-2257, October 2021., 2021
ABSTRACT The morphology of the temporal region in the tetrapod skull traditionally has been a widely discussed feature of vertebrate anatomy. The evolution of different temporal openings in Amniota (mammals, birds, and reptiles), Lissamphibia (frogs, salamanders, and caecilians), and several extinct tetrapod groups has sparked debates on the ...
Pascal Abel, Ingmar Werneburg
wiley   +1 more source

Unenlagiid theropods: are they members of the Dromaeosauridae (Theropoda, Maniraptora)?

Anais da Academia Brasileira de Ciências, 2011
In the present paper we analyze the phylogenetic position of the derived Gondwanan theropod clade Unenlagiidae. Although this group has been frequently considered as deeply nested within Deinonychosauria and Dromaeosauridae, most of the features ...
Federico L. Agnolin, Fernando E. Novas
doaj   +1 more source

Cranial anatomy of Anchiornis huxleyi (Theropoda: Paraves) sheds new light on bird skull evolution [PDF]

古脊椎动物学报 (中英文版)
The origin of birds from theropod dinosaurs, by any measures, is the most eye-catching evolutionary transition in the history of life, which encompasses numerous extensive morphological and biological changes. Compared to postcranium, little progress has
WANG Min, WANG Xiao-Li, ZHENG Xiao-Ting, ZHOU Zhong-He
doaj   +1 more source

Review of the tetrapod skull-neck boundary: implications for the evolution of the atlas-axis complex. [PDF]

Biol Rev Camb Philos Soc
ABSTRACT This review describes variation in modern and fossil occiput–atlas–axis complex anatomy of total group Tetrapoda with the aim of documenting the range of structural variation throughout their evolutionary history to establish grounds for comparison of the complex between tetrapod clades.
Korneisel DE, Maddin HC.
europepmc   +2 more sources

Mosaic evolution in an asymmetrically feathered troodontid dinosaur with transitional features [PDF]

, 2017
Asymmetrical feathers have been associated with flight capability but are also found in species that do not fly, and their appearance was a major event in feather evolution.
A Ennos, A Feduccia, AH Turner, ALR Thomas, AP Russell, C Foth, C Foth, C Swisher, CA Brochu, CA Forster, CW Gilmore, DA Russell, DE Alexander, DY Hu, F Jin, FV Huene, G Dyke, J Gauthier, J Hall, J Lü, JA Clarke, JC Lü, JH Ostrom, M Norell, MA Norell, MA Norell, NE Campione, OC Marsh, P Currie, P Godefroit, P Godefroit, P Senter, P Senter, PA Goloboff, PJ Makovicky, Q Ji, RB Irmis, RN Brandon, RO Prum, RÅ Norberg, S Ji, SJ Nesbitt, SL Brusatte, T Rowe, TA Dececchi, TG Kaye, TJ Feo, TJ Feo, TRJr Holtz, UM Norberg, VA Tucker, X Xu, X Xu, X Xu, X Xu, X Xu, X Xu, X Xu, X Xu, X Xu, X Xu, X Xu, X Xu, X Xu, X Xu, X Xu, X Xu, X Xu, XL Wang, XT Zheng, ZH Zhou   +70 more
core   +2 more sources