Results 81 to 90 of about 1,440 (226)

First pterosaur remains from the Cretaceous of Poland [PDF]

open access: yes, 2013
The first records of pterosaurs from the Cretaceous of Poland are reported, on the basis of fragmentary remains from the marine Upper Albian (Lower Cretaceous) of the Annopol Anticline, central Poland.
Machalski, Marcin, Martill, David M.
core  

Egg shape changes at the theropod–bird transition, and a morphometric study of amniote eggs [PDF]

open access: yes, 2014
The eggs of amniotes exhibit a remarkable variety of shapes, from spherical to elongate and from symmetrical to asymmetrical. We examine eggshell geometry in a diverse sample of fossil and living amniotes using geometric morphometrics and linear ...
Abramoff MD   +14 more
core   +1 more source

Extending the Geographic Range of Pterosaurs in the Araripe Basin: First Record from the Romualdo Formation (Araripe Basin) in Piauí, Brazil [PDF]

open access: yesAnais da Academia Brasileira de Ciências
The Araripe Basin in northeastern Brazil is a key site for Cretaceous pterosaur fossils from Gondwanan deposits. Most discoveries are concentrated in its northern portion, particularly in Ceará state, within the Crato and Romualdo formations. In contrast,
RENAN A.M. BANTIM   +5 more
doaj   +1 more source

A new toothless pterosaur (Pterodactyloidea) from Southern Brazil with insights into the paleoecology of a Cretaceous desert

open access: yesAnais da Academia Brasileira de Ciências
Abstract: The first pterosaur bone bed from Brazil was reported in 2014 at the outskirts of the town Cruzeiro do Oeste, Paraná State, in the Southern region of the country. Here named 'cemitério dos pterossauros' site, these outcrops were referred to the
ALEXANDER W.A. KELLNER   +4 more
doaj   +1 more source

Preliminary observations on the bone histology of the Middle Triassic pseudosuchian archosaur Batrachotomus kupferzellensis reveal fast growth with laminar fibrolamellar bone tissue [PDF]

open access: yes, 2017
The bone tissue of femur, rib, and gastralia from three different individuals of the Middle Triassic pseudosuchian Batrachotomus kupferzellensis from southern Germany is studied.
Foth, Christian   +2 more
core   +1 more source

The Evolution of Pneumatic Foramina in Pterosaur Vertebrae

open access: yesAnais da Academia Brasileira de Ciências, 2019
: Pterosaurs possess skeletal pneumatization, which can be assessed externally through the observation of pneumatic foramina. These foramina vary in position, shape, and number among taxa.
RICHARD BUCHMANN, TAISSA RODRIGUES
doaj   +1 more source

Eggshell and Histology Provide Insight on the Life History of a Pterosaur with Two Functional Ovaries

open access: yesAnais da Academia Brasileira de Ciências, 2015
The counterpart of a previously described non-pterodactyloid pterosaur with an egg revealed the presence of a second egg inside the body cavity of this gravid female.
XIAOLIN WANG   +10 more
doaj   +1 more source

Discrete and continuous character-based disparity analyses converge to the same macroevolutionary signa. A case study from captorhinids [PDF]

open access: yes, 2017
The relationship between diversity and disparity during the evolutionary history of a clade provides unique insights into evolutionary radiations and the biological response to bottlenecks and to extinctions.
Brocklehurst, Neil   +2 more
core   +2 more sources

Exploring the complex cranial morphology of Tupandactylus imperator (Pterodactyloidea, Tapejaridae) based on a new specimen [PDF]

open access: yesAnais da Academia Brasileira de Ciências
Tupandactylus imperator, a striking tapejarid pterosaur from the Lower Cretaceous (Aptian) Crato Formation (Araripe Basin), is renowned for its extraordinary cranial crest, one of the proportionally largest among pterosaurs and, indeed, also among all ...
LUCAS CANEJO   +2 more
doaj   +1 more source

Rise of Dinosaurs Reveals Major Body-Size Transitions Are Driven by Passive Processes of Trait Evolution [PDF]

open access: yes, 2012
A major macroevolutionary question concerns how long-term patterns of body-size evolution are underpinned by smaller scale processes along lineages.
Benson, Roger B. J.   +2 more
core   +1 more source

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