Results 51 to 60 of about 5,020 (237)

Theropod tracks from the Upper Jurassic Dongxing formation Dongxing city and an overview of dinosaur assemblages from Guangxi, China

Earth History and Biodiversity
Guangxi Zhuang Autonomous Region is an important region for dinosaur fossil discoveries in southern China, but its Jurassic dinosaur record remains relatively sparse.
Lida Xing, Jinyou Mo, Hang Yin, Guan He, Zhiyu Liang, Qiyan Chen, Eric Buffetaut, Haiyan Tong   +7 more
doaj   +1 more source

Molecular shifts in limb identity underlie development of feathered feet in two domestic avian species

eLife, 2016
Birds display remarkable diversity in the distribution and morphology of scales and feathers on their feet, yet the genetic and developmental mechanisms governing this diversity remain unknown.
Eric T Domyan, Zev Kronenberg, Carlos R Infante, Anna I Vickrey, Sydney A Stringham, Rebecca Bruders, Michael W Guernsey, Sungdae Park, Jason Payne, Robert B Beckstead, Gabrielle Kardon, Douglas B Menke, Mark Yandell, Michael D Shapiro   +13 more
doaj   +1 more source

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

Forelimb reduction and digit loss were evolutionarily decoupled in oviraptorosaurian theropod dinosaurs

Royal Society Open Science
Theropod forelimbs exhibit wide morphological disparity, from the elongated wings of birds to the diminutive arms of T. rex. A wealth of work has sought to understand the evolution of bird flight via arm elongation, but despite widespread occurrences of ...
Amelia Mead, Gregory Funston, Stephen Brusatte   +2 more
doaj   +1 more source

Comment on “A new Arctic hadrosaurid from the Prince Creek Formation (lower Maastrichtian) of northern Alaska” by Hirotsugu Mori, Patrick S. Druckenmiller, and Gregory M. Erickson [PDF]

Acta Palaeontologica Polonica, 2016
Recently Mori et al. (2016) published a paper describing a new tax- on of hadrosaurid dinosaur from the Upper Cretaceous Prince Creek Formation of the North Slope Alaska, a rock unit that has recently proven to be a productive source of scientific ...
Anthony R. Fiorillo
doaj   +1 more source

Clade‐wide morphological and functional variation of the sauropsid columella

The Anatomical Record, EarlyView.
Abstract The columella (=stapes) is the middle ear bone of reptiles that transmits vibrations from the environment to the inner ear. It has been shown to exhibit extensive interspecific morphological disparity in several clades; however, its morphological variation and associated functional consequences remain poorly described.
John Peacock, Serjoscha W. Evers, Tiago R. Simões, Garth M. Spellman, Daniel J. Field   +4 more
wiley   +1 more source

Computational fluid dynamics simulations of airflow through the nasal passages of rhinolophoid bats

The Anatomical Record, EarlyView.
Abstract The nasal passages of bats that emit their echolocation call through their nostrils have adapted for sound emission as well as standard respiratory and olfactory functions. Rhinolophids, hipposiderids and rhinonycterids all use a high duty cycle (HDC) echolocation strategy.
Carley Goodwin, Jason M. Bourke, Daisuke Koyabu, Kyle N. Armstrong, Vuong T. Tu, Thongchai Ngamprasertwong, Thanakul Wannaprasert, Laura A. B. Wilson   +7 more
wiley   +1 more source

Exploring the cranial morphology and possible convergences of Triassic non‐crocodylomorph pseudosuchians (Archosauria: Pseudosuchia) with other sauropsids through linear morphometrics

The Anatomical Record, EarlyView.
Abstract Triassic pseudosuchians had highly diversified cranial morphologies. These archosaurs occupied diverse ecological roles, ranging from terrestrial predators and herbivores to semiaquatic ambush predators and possible waders. Here, we apply linear cranial morphometrics to assess possible convergences with other sauropsids from the clades ...
Rafael Terras, Rodrigo Temp Müller, Leonardo Kerber, Mirian Carbonera   +3 more
wiley   +1 more source

First occurrence of polymicrobial ulcer in dinosaursFirst occurrence of polymicrobial ulcer in dinosaurs [PDF]

Royal Society Open Science
Evidence of palaeopathological bone lesions in large-sized ornithopod dinosaurs is nowadays increasing significantly. However, most of these lesions are documented in derived ornithopods such as hadrosaurs, while pathologies associated with other ...
Javier Salas-Herrera, José M. Gasulla, Santiago F. Marco Domenech, Ricardo Tosca-Segura, Francisco Ortega, Fernando Escaso   +5 more
doaj   +1 more source

Dinosaur biomechanics [PDF]

Proceedings of the Royal Society B: Biological Sciences, 2006
Biomechanics has made large contributions to dinosaur biology. It has enabled us to estimate both the speeds at which dinosaurs generally moved and the maximum speeds of which they may have been capable. It has told us about the range of postures they could have adopted, for locomotion and for feeding, and about the problems of blood circulation in ...
openaire   +2 more sources