Results 51 to 60 of about 22,860 (301)

Comparative cranial biomechanics reveal macroevolutionary trends in theropod dinosaurs, with emphasis on Tyrannosauroidea

The Anatomical Record, EarlyView.
Abstract Tyrannosaurus is viewed as a model organism in vertebrate paleontology, with numerous studies analyzing its feeding biomechanics. Nonetheless, the evolution of this feeding performance has been under‐addressed in Tyrannosauroidea, especially in basal tyrannosauroids. Here we used muscle‐force reconstruction and finite element analysis (FEA) to
Evan Johnson‐Ransom, Paul Gignac, Daniel E. Barta, Ryan N. Felice, Eric Snively   +4 more
wiley   +1 more source

Thai amber: insights into early diatom history?

BSGF - Earth Sciences Bulletin, 2020
The origin of the diatoms still remains enigmatic. Their fossil record is scarce until the Late Cretaceous and great divergences exist between molecular data and the earliest fossil evidence. While molecular data indicate an origin during the Triassic or
Girard Vincent, Saint Martin Simona, Buffetaut Eric, Saint Martin Jean-Paul, Néraudeau Didier, Peyrot Daniel, Roghi Guido, Ragazzi Eugenio, Suteethorn Varavudh   +8 more
doaj   +1 more source

Neopterygian phylogeny: the merger assay [PDF]

Royal Society Open Science, 2018
The phylogenetic relationships of the recently described genus †Ticinolepis from the Middle Triassic of the Monte San Giorgio are explored through cladistic analyses of the so far largest morphological dataset for fossil actinopterygians, including ...
Adriana López-Arbarello, Emilia Sferco   +1 more
doaj   +1 more source

A second species of non‐crocodyliform crocodylomorph from the Late Triassic fissure deposits of southwestern UK: Implications for locomotory ecological diversity in Saltoposuchidae

The Anatomical Record, EarlyView.
Abstract The Late Triassic–Early Jurassic fissures of the Bristol Channel area (southwest England and south Wales) are renowned for their diverse vertebrate faunas. These assemblages have yielded an array of predominantly small‐bodied forms that are crucial to our understanding of the early evolution of several major tetrapod clades.
Ewan H. Bodenham, Stephan N. F. Spiekman, Susannah C. R. Maidment, Paul Upchurch, Philip D. Mannion   +4 more
wiley   +1 more source

Inter‐ and intraspecific variation in theropod dinosaur dental microwear and its palaeoecological implications

The Anatomical Record, EarlyView.
Abstract Differences in skull and tooth morphology, stomach contents, and estimated bite force between medium‐to‐large sized (≥100 kg) predatory theropod dinosaurs have long been suspected to correlate with differences in their diets and dietary guilds (e.g., hypercarnivory, piscivory).
Cassius Morrison, James Gregory, Christopher Jackson, Jordan Bestwick, Katlin Schroeder, Samuel J.L. Gascoigne, Paul Bills, Laura B. Porro, Philip D. Mannion, Paul M. Barrett   +9 more
wiley   +1 more source

Chronology and Geochemistry on Mesozoic Diorite from the Xi′anli Iron Ore Area in Pingshun, Shanxi Province

Yankuang ceshi, 2013
The Shanxi Pingshun region is located in the west limb of a large-scale anticline of Taighang Mountain and is to the southeast of the Taihang upwell of Lüliang-Taihang fault block.
WANG Yong, CHEN Zheng-le, CHEN Bai-lin, DONG Fa-xian, ZHANG Hai-dong, HAN Feng-bin, ZHOU Yong-gui   +6 more
doaj  

Redescription of the Triassic cynodont Cistecynodon parvus and reassessment of its phylogeny

The Anatomical Record, EarlyView.
Abstract Cynodontia is an important subclade of Therapsida that first occurred in the late Permian. It includes extinct subclades which are the non‐mammaliaform cynodonts and Mammaliaformes, with the latter ultimately giving rise to crown mammals. The systematics of non‐mammaliaform cynodonts has been extensively studied and is relatively well‐resolved,
Erin S. Lund, Frederik P. Wolvaardt, Roger M. H. Smith, Jaganmoy Jodder, Julien Benoit   +4 more
wiley   +1 more source

Injuries in deep time: interpreting competitive behaviours in extinct reptiles via palaeopathology

Biological Reviews, EarlyView.
ABSTRACT For over a century, palaeopathology has been used as a tool for understanding evolution, disease in past communities and populations, and to interpret behaviour of extinct taxa. Physical traumas in particular have frequently been the justification for interpretations about aggressive and even competitive behaviours in extinct taxa.
Maximilian Scott, Julia A. Gamble, Caleb Marshall Brown, Kirstin S. Brink   +3 more
wiley   +1 more source

Structural deformation and geochronology of the ductile shear zone along the southern margin of the Foping dome, South Qinling

Dizhi lixue xuebao
Objective  A typical granulite–migmatite–gneiss dome developed in the Foping area of the central Qinling orogenic belt. This area is key to studying the metamorphic deformation of continental crust and the Mesozoic tectonic evolution of Qinling.
YU Kecheng, SUN Shengsi, DONG Yunpeng, HUI Bo, CHENG Chao, ZHANG Bin, ZHANG Yining, LI Xinyu   +7 more
doaj   +1 more source

A Late Jurassic deep-bodied actinopterygian fish from Antarctica [PDF]

Acta Palaeontologica Polonica
Mesozoic deep-bodied actinopterygians are of interest given, among others, the various modes of feeding exhibited by these fishes. Regrettably, most of their fossil record is restricted to a limited number of localities in Europe.
Soledad Gouiric-Cavalli, Ari Iglesias, Bárbara Cariglino, Marcelo A. Reguero   +3 more
doaj   +1 more source