Results 31 to 40 of about 343 (96)

Elliptic Fourier analysis as a tool for the taxonomic identification of isolated theropod pedal phalanges

The Anatomical Record, EarlyView.
Abstract Studies of Upper Cretaceous deposits in North America have provided invaluable insights into the continental ecosystems of this time. Theropod (Saurischia, Dinosauria) pedal phalanges are commonplace in these deposits but can be difficult to identify at a finer taxonomic resolution.
Trystan M. Warnock‐Juteau, Stephanie M. Smith, Thomas M. Cullen   +2 more
wiley   +1 more source

On Galileo’s Tallest Column

Mathematical Problems in Engineering, Volume 2015, Issue 1, 2015., 2015
The height at which an unloaded column will fail under its own weight was calculated for first time by Galileo for cylindrical columns. Galileo questioned himself if there exists a shape function for the cross section of the column with which it can attain a greater height than the cylindrical column.
Mariano Vázquez Espí, Jaime Cervera Bravo, Carlos Olmedo Rojas, Reza Jazar   +3 more
wiley   +1 more source

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

Biological Reviews, Volume 101, Issue 4, Page 1760-1778, August 2026.
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

Inferred presence of extraoral tissues in Triassic archosauromorphs and the evolutionary implications for the clade Sauropsida

Palaeontology, Volume 69, Issue 3, 2026.
Abstract Recent work has suggested that the presence of extraoral soft tissues (‘lips’), in the form of labial scales in theropod dinosaurs, could be inferred based on: anteroposteriorly distributed foramina in the rostral bones, similar to extant lepidosaurs; vertically projected teeth; uniform enamel thickness in maxillary teeth; and an allometric ...
Rafael Terras, Jaqueline Borger, Manuelle O. P. Almeida, Silvia Bettin, Owen A. Higgins, Giulia Marciani, Stefano Benazzi, Rodrigo T. Müller, Leonardo Kerber, Mirian Carbonera   +9 more
wiley   +1 more source

A SUBADULT MAXILLA OF A TYRANNOSAURIDAE FROM THE TWO MEDICINE FORMATION, MONTANA, UNITED STATES

Papéis Avulsos de Zoologia
Daspletosaurus is a Campanian genus of Tyrannosauridae from North America. This genus occupied the same geographic area of Albertosaurus, but remains of Albertosaurus are more abundant than Daspletosaurus.
RAFAEL DELCOURT
doaj   +1 more source

Theropod dinosaur diversity of the lower English Wealden: analysis of a tooth‐based fauna from the Wadhurst Clay Formation (Lower Cretaceous: Valanginian) via phylogenetic, discriminant and machine learning methods

Papers in Palaeontology, Volume 10, Issue 6, November/December 2024.
Abstract The Lower Cretaceous Wealden Supergroup of southern England yields a diverse assemblage of theropod dinosaurs, its taxa being represented by fragments in addition to some of the most informative associated skeletons of the European Mesozoic. Spinosaurids, neovenatorid allosauroids, tyrannosauroids and dromaeosaurids are among reported Wealden ...
Chris T. Barker, Lucy Handford, Darren Naish, Simon Wills, Christophe Hendrickx, Phil Hadland, Dave Brockhurst, Neil J. Gostling   +7 more
wiley   +1 more source

Observations on the skull of the type specimen of Tyrannosaurus rex Osborn, 1905

All Earth
The skull bones of the type specimen of Tyrannosaurus rex have been undescribed since the early 20th Century. The objectives were to provide a description of the type skull, assess the homology of characters seen in adults and juveniles, and test the ...
Thomas D. Carr
doaj   +1 more source

The dentition of tyrannosauroid theropods: a review

Discover Geoscience
Tyrannosauroidea is a clade of early-diverging carnivorous coelurosaur theropods known from the Middle Jurassic to Late Cretaceous that includes the eponymous Tyrannosaurus rex and its closest relatives. One of the most notable diagnostic features of the
Carlos A. Hernández-Luna, Christophe Hendrickx, Alejandro Hiram Marín-Leyva, Thomas D. Carr   +3 more
doaj   +1 more source

Dientes de terópodos del Cretácico Superior del Estado de Coahuila, México

Revista Mexicana de Ciencias Geológicas, 2017
En México, los terópodos son un grupo de dinosaurios poco conocido, el escaso material descrito ha sido referido solamente a nivel de “familia”. Como resultado de la investigación paleontológica realizada en el Estado de Coahuila, se recuperó material ...
Esperanza Torres-Rodríguez, Marisol Montellano-Ballesteros, René Hernández-Rivera, Mouloud Benammi   +3 more
doaj  

Hatchlings of Tyrannosaurus rex and the Evolution of Dinosaur Reproductive Strategies

Biology
Tyrannosaurs were giant predatory dinosaurs that occupied the apex of Late Cretaceous food chains. Little is known about the early life and reproductive ecology of tyrannosaurs due to the extreme rarity of hatchling and juvenile fossils.
Nicholas R. Longrich, Peter J. Makovicky, Tim Tokaryk, David M. L. Cooper, Evan T. Saitta, Gregory M. Erickson, Tamas Szekely, Eric Snively   +7 more
doaj   +1 more source