Results 71 to 80 of about 1,568 (192)

Evaluating the paleoecology of the Megaraptora (Dinosauria: Theropoda) through biomechanical approaches

Spanish Journal of Palaeontology
Megaraptoran theropods represent an enigmatic and unusual lineage of theropod dinosaurs that are characterized by their unique bauplan including a low, elongated skull and robust forelimbs with enlarged claws.
Chan-gyu Yun
semanticscholar   +1 more source

An insect †Archaeopteryx: Cretaceous amber fossil elucidates the evolution of complex host detection and ovipositor mechanisms in parasitoid woodwasps (Hymenoptera: Orussoidea)

Systematic Entomology, Volume 50, Issue 3, Page 630-645, July 2025.
We describe †Cretovelona orussopteryx n. gen. & sp. from Kachin amber. The fossil is examined with synchrotron scanning and integrated into an existing morphological data set for Orussoidea. This fossil parasitoid wasp displays a unique character combination demonstrating intermediate conditions in evolving the complex features employed in echo ...
Lars Vilhelmsen, Brendon E. Boudinot, Jörg U. Hammel, Hiroshi Nakamine, Shûhei Yamamoto   +4 more
wiley   +1 more source

Troodontidae (Dinosauria: Theropoda) from the Upper Cretaceous of Uzbekistan [PDF]

Cretaceous Research, 2016
Abstract To date three taxa of troodontid theropod dinosaurs have been recognized from Upper Cretaceous strata in two regions of the Kyzylkum Desert in Uzbekistan. The Cenomanian Khodzhakul Formation in the southwestern Kyzylkum Desert has yielded isolated serrated teeth and some postcranial bones of an indeterminate troodontid.
Hans-Dieter Sues, Alexander O. Averianov, Alexander O. Averianov   +2 more
openaire   +3 more sources

Hindlimb biomechanics of Lagosuchus talampayensis (Archosauria, Dinosauriformes), with comments on skeletal morphology

Journal of Anatomy, Volume 246, Issue 6, Page 948-973, June 2025.
The study constructs a 3D whole‐body biomechanical model of the Late Triassic archosaurian reptile Lagosuchus talampayensis, which includes reconstructions of the hindlimb musculature. The process of constructing the model revealed that numerous limb bones curated with the main specimens are from other, as‐yet‐undetermined archosaurs.
Alejandro Otero, Peter J. Bishop, John R. Hutchinson   +2 more
wiley   +1 more source

Neural canal ridges: A novel osteological correlate of postcranial neuroanatomy in dinosaurs

The Anatomical Record, Volume 308, Issue 5, Page 1349-1368, May 2025.
Abstract In this article, we document the widespread presence of bony ridges in the neural canals of non‐avian dinosaurs, including a wide diversity of sauropods, two theropods, a thyreophoran, and a hadrosaur. These structures are present only in the caudal vertebrae.
Jessie Atterholt, Mathew J. Wedel, Ron Tykoski, Anthony R. Fiorillo, Femke Holwerda, Thierra K. Nalley, Taormina Lepore, John Yasmer   +7 more
wiley   +1 more source

Birdlike growth and mixed-age flocks in avimimids (Theropoda, Oviraptorosauria) [PDF]

Scientific Reports, 2019
AbstractAvimimids were unusual, birdlike oviraptorosaurs from the Late Cretaceous of Asia. Initially enigmatic, new information has ameliorated the understanding of their anatomy, phylogenetic position, and behaviour. A monodominant bonebed from the Nemegt Formation of Mongolia showed that some avimimids were gregarious, but the site is unusual in the ...
G. F. Funston, P. J. Currie, M. J. Ryan, Z.-M. Dong   +3 more
openaire   +3 more sources

Osteology of the unenlagiid theropod Neuquenraptor argentinus from the Late Cretaceous of Patagonia [PDF]

Acta Palaeontologica Polonica, 2017
Neuquenraptor argentinus was described as the first undoubted deinonychosaurian theropod from Gondwana. The only known specimen is represented by a fragmentary skeleton, including a nearly complete foot, coming from Late Cretaceous beds of Neuquén ...
Federico Brissón Egli, Alexis M. Aranciaga Rolando, Federico L. Agnolín, Fernando E. Novas   +3 more
doaj   +1 more source

How smart was T. rex? Testing claims of exceptional cognition in dinosaurs and the application of neuron count estimates in palaeontological research

The Anatomical Record, Volume 307, Issue 12, Page 3685-3716, December 2024.
Abstract Recent years have seen increasing scientific interest in whether neuron counts can act as correlates of diverse biological phenomena. Lately, Herculano‐Houzel (2023) argued that fossil endocasts and comparative neurological data from extant sauropsids allow to reconstruct telencephalic neuron counts in Mesozoic dinosaurs and pterosaurs, which ...
Kai R. Caspar, Cristián Gutiérrez‐Ibáñez, Ornella C. Bertrand, Thomas Carr, Jennifer A. D. Colbourne, Arthur Erb, Hady George, Thomas R. Holtz Jr, Darren Naish, Douglas R. Wylie, Grant R. Hurlburt   +10 more
wiley   +1 more source

Theropoda

, 1983
The morphology of theropod locomotion can be derived from that of pseudosuchians. The change from a facultative biped (thecodont) to an obligate theropod biped is understandable in terms of efficiency. Bipedal locomotion is more energy efficient than is a reptilian method of quad­ rupedal locomotion (Hotton 1980).
openaire   +2 more sources

The wings before the bird: an evaluation of flapping-based locomotory hypotheses in bird antecedents [PDF]

PeerJ, 2016
Background: Powered flight is implicated as a major driver for the success of birds. Here we examine the effectiveness of three hypothesized pathways for the evolution of the flight stroke, the forelimb motion that powers aerial locomotion, in a ...
T. Alexander Dececchi, Hans C.E. Larsson, Michael B. Habib   +2 more
doaj   +2 more sources