Results 31 to 40 of about 4,665 (222)

New evidence of feathers in the Crato Formation supporting a reappraisal on the presence of Aves

Anais da Academia Brasileira de Ciências, 2011
The preservation of delicate structures such as feathers is very rare in the paleontological record, due to the fragility of their components. Fossil feathers have been reported from approximately 50 deposits around the world, from the Late Jurassic to ...
Juliana M. Sayão, Antonio A.F. Saraiva, Angelica M.K. Uejima   +2 more
doaj   +1 more source

Tiny, ornamented eggs and eggshell from the Upper Cretaceous of Utah represent a new ootaxon with theropod affinities

Scientific Reports, 2021
A new Cretaceous ootaxon (eggshell type) from the Kaiparowits Formation of Grand Staircase-Escalante National Monument is among a growing number of very small eggs described from the Mesozoic.
Sara E. Oser, Karen Chin, Joseph J. W. Sertich, David J. Varricchio, Seung Choi, Jeffrey Rifkin   +5 more
doaj   +1 more source

A new megaraptoran dinosaur from the Lower Cretaceous Wessex Formation, UK, and its implications for theropod evolution and biogeographyA new megaraptoran dinosaur from the Lower Cretaceous Wessex Formation, UK, and its implications for theropod evolution and biogeography [PDF]

Royal Society Open Science
Theropod dinosaur remains from the Barremian (Lower Cretaceous) Wessex Formation of the Isle of Wight, UK, are rare and often fragmentary. Here, we present a previously undescribed braincase from this formation that represents a new coelurosaurian ...
Cassius Morrison, Charlie R. Scherer, Philip Mannion, Laura B. Porro, Brett Clark, Daniel D. Folkes, Paul M. Barrett   +6 more
doaj   +1 more source

A methodology of theropod print replication utilising the pedal reconstruction of Australovenator and a simulated paleo-sediment [PDF]

PeerJ, 2017
Distinguishing the difference between theropod and ornithopod footprints has proved a difficult task due to their similarities. Herein our aim was to produce a method where a skeleton could be more closely matched to actual fossilised footprints.
Matt A. White, Alex G. Cook, Steven J. Rumbold   +2 more
doaj   +2 more sources

Reassessment of the evidence for postcranial skeletal pneumaticity in Triassic archosaurs, and the early evolution of the avian respiratory system. [PDF]

, 2012
Uniquely among extant vertebrates, birds possess complex respiratory systems characterised by the combination of small, rigid lungs, extensive pulmonary air sacs that possess diverticula that invade (pneumatise) the postcranial skeleton, unidirectional ...
Barrett, Paul M., David J. Gower (175487), Butler, Richard J.; id_orcid, Gower, David J., Richard J. Butler (172299), Butler, Richard J., Richard J Butler, David J Gower, Paul M. Barrett (162813), Paul M Barrett   +9 more
core   +2 more sources

New theropod (Tetanurae: Avetheropoda) material from the ‘mid’-Cretaceous Griman Greek Formation at Lightning Ridge, New South Wales, Australia [PDF]

Royal Society Open Science, 2019
The limited fossil record of Australian Cretaceous theropods is dominated by megaraptorids, reported from associated and isolated material from the Early Cretaceous of Victoria and the ‘Mid’-Cretaceous of central-north New South Wales and central ...
Tom Brougham, Elizabeth T. Smith, Phil R. Bell   +2 more
doaj   +1 more source

Small theropod teeth from the Late Cretaceous of the San Juan Basin, northwestern New Mexico and their implications for understanding latest Cretaceous dinosaur evolution.

PLoS ONE, 2014
Studying the evolution and biogeographic distribution of dinosaurs during the latest Cretaceous is critical for better understanding the end-Cretaceous extinction event that killed off all non-avian dinosaurs.
Thomas E Williamson, Stephen L Brusatte
doaj   +1 more source

Shake a tail feather: the evolution of the theropod tail into a stiff aerodynamic surface.

PLoS ONE, 2013
Theropod dinosaurs show striking morphological and functional tail variation; e.g., a long, robust, basal theropod tail used for counterbalance, or a short, modern avian tail used as an aerodynamic surface.
Michael Pittman, Stephen M Gatesy, Paul Upchurch, Anjali Goswami, John R Hutchinson   +4 more
doaj   +1 more source

Geometric morphometric analysis of intratrackway variability: a case study on theropod and ornithopod dinosaur trackways from Münchehagen (Lower Cretaceous, Germany) [PDF]

PeerJ, 2016
A profound understanding of the influence of trackmaker anatomy, foot movements and substrate properties is crucial for any interpretation of fossil tracks.
Jens N. Lallensack, Anneke H. van Heteren, Oliver Wings   +2 more
doaj   +2 more sources

Opalized archosaur remains from the Bulldog Shale (Aptian: Lower Cretaceous) of South Australia [PDF]

Terrestrial reptile remains are very rare in the Lower Cretaceous of South Australia, but include the holotype of the small theropod Kakuru. Here, we review this taxon and other archosaur specimens collected from the Bulldog Shale (Aptian) of Andamooka ...
Benson, R. B. J., Kear, B. P., Barrett, P. M.   +2 more
core   +1 more source