Results 51 to 60 of about 784 (138)

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

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

Palaeontology, Volume 69, Issue 3, May/June 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

Cranial ontogenetic variation in early saurischians and the role of heterochrony in the diversification of predatory dinosaurs [PDF]

Non-avian saurischian skulls underwent at least 165 million years of evolution and shapes varied from elongated skulls, such as in the theropod Coelophysis, to short and box-shaped skulls, such as in the sauropod Camarasaurus.
Ezcurra, Martin D., Foth​, Christian, Hedrick, Brandon P.   +2 more
core   +1 more source

Dinosaur morphological diversity and the end-Cretaceous extinction [PDF]

The extinction of non-avian dinosaurs 65 million years ago is a perpetual topic of fascination, and lasting debate has focused on whether dinosaur biodiversity was in decline before end-Cretaceous volcanism and bolide impact.
A Prieto-Márquez, AB Smith, CN Ciampaglio, D Dashzeveg, DB Weishampel, DE Fastovsky, EM Roberts, GT Lloyd, GT Lloyd, JB Scannella, JD Archibald, JD Archibald, JR Horner, L Dingus, LW Alvarez, M Foote, M Friedman, MA Wills, MA Wills, MJ Benton, MT Carrano, NE Campione, NR Longrich, NR Longrich, P Godefroit, P Schulte, P Upchurch, PJ Wagner, PM Barrett, PM Sheehan, PM Sheehan, RB Irmis, RE Sloan, RJ Butler, SC Wang, SD Sampson, SE Peters, SL Brusatte, SL Brusatte, SL Brusatte, TD Carr, TR Lyson, Z Csiki   +42 more
core   +1 more source

The muscle-powered bite of allosaurus (dinosauria; theropoda): an interpretation of cranio-dental morphology [PDF]

11 pages, 7 figures.[EN] The skull morphology of Allosaurus has been the subject of functional interpretations which imply a predatory behaviour radically different from that recorded in any predatory land vertebrate.
Antón, Mauricio, Salesa, Manuel J., Sánchez, Israel Miguel, Turner, A.   +3 more
core   +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

A survey of dinosaur diversity by clade, age, place of discovery and year of description [PDF]

Dinosaur diversity is analyzed in terms of the number of valid genera within each major clade, Mesozoic age, place of discovery and year of description. Aves (Archaeopteryx + Neornithes) is excluded. Nomina nuda and nomina dubia are not counted.
Taylor, Michael
core   +1 more source

Laser-Stimulated Fluorescence in Paleontology [PDF]

Fluorescence using ultraviolet (UV) light has seen increased use as a tool in paleontology over the last decade. Laser-stimulated fluorescence (LSF) is a next generation technique that is emerging as a way to fluoresce paleontological specimens that ...
Burnham, DA, Falk, AR, Gong, EP, Kaye, TG, Martin, LD, Pittman, MD, Sereno, PC, Wang, YN, Xu, X   +8 more
core   +1 more source