Results 41 to 50 of about 655 (146)

Skeletal completeness of the non‐avian theropod dinosaur fossil record

Palaeontology, Volume 62, Issue 6, Page 951-981, November 2019., 2019
Abstract Non‐avian theropods were a highly successful clade of bipedal, predominantly carnivorous, dinosaurs. Their diversity and macroevolutionary patterns have been the subject of many studies. Changes in fossil specimen completeness through time and space can bias our understanding of macroevolution.
Daniel D. Cashmore, Richard J. Butler, Roger Benson   +2 more
wiley   +1 more source

The geometry of taking flight: Limb morphometrics in Mesozoic theropods

Journal of Morphology, Volume 276, Issue 2, Page 152-166, February 2015., 2015
ABSTRACT Theropoda was one of the most successful dinosaurian clades during the Mesozoic and has remained a dominant component of faunas throughout the Cenozoic, with nearly 10,000 extant representatives. The discovery of Archaeopteryx provides evidence that avian theropods evolved at least 155 million years ago and that more than half of the tenure of
Brandon P. Hedrick, Phillip L. Manning, Eric R. Lynch, Samantha A. Cordero, Peter Dodson   +4 more
wiley   +1 more source

Macroevolutionary trends in theropod dinosaur feeding mechanics [PDF]

, 2022
Theropod dinosaurs underwent some of the most remarkable dietary changes in vertebrate evolutionary history, shifting from ancestral carnivory to hypercarnivory and omnivory/herbivory, with some taxa eventually reverting to carnivory.
Butler, Richard, Lautenschlager, Stephan, Ma, Wai Sum, Pittman, Michael   +3 more
core   +1 more source

Theropod teeth from the upper Barremian (Lower Cretaceous) of Vadillos-1, Spain [PDF]

, 2022
The upper Barremian (Lower Cretaceous) palaeontological site of Vadillos-1 is located in the North of the Cuenca Province, Spain. It includes a sedimentary succession in “Weald” facies of brown and grey mudstones and red clays, corresponding to an ...
Alcalde Fuentes, María Rosario, Audije Gil, Julia, Berrocal Casero, Mélani, Sevilla, Paloma   +3 more
core   +4 more sources

Comparative cranial biomechanics reveal macroevolutionary trends in theropod dinosaurs, with emphasis on Tyrannosauroidea

The Anatomical Record, EarlyView.
Abstract Tyrannosaurus is viewed as a model organism in vertebrate paleontology, with numerous studies analyzing its feeding biomechanics. Nonetheless, the evolution of this feeding performance has been under‐addressed in Tyrannosauroidea, especially in basal tyrannosauroids. Here we used muscle‐force reconstruction and finite element analysis (FEA) to
Evan Johnson‐Ransom, Paul Gignac, Daniel E. Barta, Ryan N. Felice, Eric Snively   +4 more
wiley   +1 more source

Diet of bird‐like troodontid dinosaurs: synthesis of a contentious clade

Biological Reviews, EarlyView.
ABSTRACT Troodontidae is a clade of small‐to medium‐sized maniraptoran theropods that mainly lived in Laurasia (modern Asia, North America and Europe) during the Jurassic and Cretaceous periods and are believed to have had a variety of diets. The uniqueness of troodontid teeth suggests that they diverged from the typical flesh‐based diet of non‐avian ...
Yui Chi Fan, Case Vincent Miller, Michael Pittman   +2 more
wiley   +1 more source

Nuevos datos sobre los dinosaurios terópodos (Saurischia: Theropoda) del Cretácico superior de los Pirineos Sur-Centrales (Huesca y Lleida) [PDF]

, 2004
Six new theropod teeth recovered trom the Blasi 1-3 sites (Upper Maastrichtian) in Arén (Huesca province, Spain) are described and added to the twenty six teeth already known from these and other five localities of Late Campanian-Early Maastrichtian ...
Canudo, José Ignacio, López Martínez, Nieves, Ruiz Omeñaca, José Ignacio, Torices Hernández, Angélica   +3 more
core   +1 more source

The Earliest Feathers from the Lower Cretaceous Dabeigou Formation of North Hebei: Implications for the Early Evolution of the Jehol Biota

Integrative Zoology, EarlyView.
This study reports two isolated feather fossils from the Lower Cretaceous Dabeigou Formation in northeastern China. Morphological analyses identified them as the earliest known feathered theropods (potentially including avian) in the Jehol Biota. This finding reveals a complex ecosystem at the dawn of the Jehol Biota, bridging the temporal and faunal ...
Qian Wu, Qian‐Nan Zhang, Dang‐Peng Xi   +2 more
wiley   +1 more source

Descriptions of Mongolian Dromaeosaurids (Dinosauria: Theropoda) and phylogeny of Dromaeosauridae [PDF]

, 2008
Thesis (Ph. D. in Science)--University of Tsukuba, (A), no.
久保田 克博
core  

Building a Bird: Musculoskeletal Modeling and Simulation of Wing-Assisted Incline Running during Avian Ontogeny [PDF]

, 2018
Flapping flight is the most power-demanding mode of locomotion, associated with a suite of anatomical specializations in extant adult birds. In contrast, many developing birds use their forelimbs to negotiate environments long before acquiring “flight ...
Ashley M. Heers, Ashley M. Heers, Jeffery W. Rankin, Jeffery W. Rankin, John R. Hutchinson   +4 more
core   +3 more sources