Results 1 to 10 of about 1,568 (192)

Avialan-like brain morphology in Sinovenator (Troodontidae, Theropoda) [PDF]

Communications Biology
Many modifications to the skull and brain anatomy occurred along the lineage encompassing non-avialan theropod dinosaurs and modern birds. Anatomical changes to the endocranium include an enlarged endocranial cavity, relatively larger optic lobes that ...
Congyu Yu, Akinobu Watanabe, Zichuan Qin, J. Logan King, Lawrence M. Witmer, Qingyu Ma, Xing Xu   +6 more
doaj   +5 more sources

A new oviraptorosaur (Dinosauria: Theropoda) from the end-Maastrichtian Hell Creek Formation of North America. [PDF]

PLoS One
Caenagnathidae is a clade of derived, Late Cretaceous oviraptorosaurian theropods from Asia and North America. Because their remains are rare and often fragmentary, caenagnathid diversity is poorly understood. Anzu wyliei is the only caenagnathid species
Atkins-Weltman KL, Simon DJ, Woodward HN, Funston GF, Snively E.   +4 more
europepmc   +2 more sources

Early Cretaceous troodontine troodontid (Dinosauria: Theropoda) from the Ohyamashimo Formation of Japan reveals the early evolution of Troodontinae. [PDF]

Sci Rep
A new troodontid dinosaur, Hypnovenator matsubaraetoheorum gen. et sp. nov., is described based on an articulated postcranial skeleton recovered from the fluvial deposits of the Albian Ohyamashimo Formation of the Sasayama Group in Tambasasayama City ...
Kubota K, Kobayashi Y, Ikeda T.
europepmc   +2 more sources

Reconstruction of the pelvic girdle and hindlimb musculature of the early tetanurans Piatnitzkysauridae (Theropoda, Megalosauroidea)

Journal of Anatomy, Volume 244, Issue 4, Page 557-593, April 2024., 2023
Piatnitzkysauridae were Jurassic theropods that represented the earliest diverging branch of Megalosauroidea, being one of the earliest lineages to have evolved moderate body size. This clade's typical body size and some unusual anatomical features raise
M. B. Lacerda, Jonathas S. Bittencourt, John R. Hutchinson   +2 more
semanticscholar   +2 more sources

Diuqin lechiguanae gen. et sp. nov., a new unenlagiine (Theropoda: Paraves) from the Bajo de la Carpa Formation (Neuquén Group, Upper Cretaceous) of Neuquén Province, Patagonia, Argentina. [PDF]

BMC Ecol Evol
Background Unenlagiine paravians are among the most relevant Gondwanan theropod dinosaur clades for understanding the origin of birds, yet their fossil record remains incomplete, with most taxa being represented by fragmentary material and/or separated ...
Porfiri JD, Baiano MA, Dos Santos DD, Gianechini FA, Pittman M, Lamanna MC.   +5 more
europepmc   +2 more sources

Ontogenetic Changes in Endocranial Anatomy in Gorgosaurus libratus (Theropoda: Tyrannosauridae) Provide Insight Into the Evolution of the Tyrannosauroid Endocranium. [PDF]

J Comp Neurol
Changes through growth (ontogenetic) in the braincase of the eutyrannosaurian tyrannosauroid Gorgosaurus libratus are discussed. Most notably, brain cavity endocasts of immature Gorgosaurus are found to more clearly show details of the brain morphology than more mature individuals, a finding that has implications for improving dinosaur paleoneurology ...
Voris JT, Therrien F, Ridgely RC, Witmer LM, Zelenitsky DK.   +4 more
europepmc   +2 more sources

Evolutionary process toward avian-like cephalic thermoregulation system in Theropoda elucidated based on nasal structures. [PDF]

R Soc Open Sci, 2023
It has long been discussed whether non-avian dinosaurs were physiologically closer to ectotherms or endotherms, with the internal nasal structure called the respiratory turbinate present in extant endotherms having been regarded as an important clue for ...
Tada S, Tsuihiji T, Matsumoto R, Hanai T, Iwami Y, Tomita N, Sato H, Tsogtbaatar K.   +7 more
europepmc   +2 more sources

Modified skulls but conservative brains? The palaeoneurology and endocranial anatomy of baryonychine dinosaurs (Theropoda: Spinosauridae)

Journal of Anatomy, Volume 242, Issue 6, Page 1124-1145, June 2023., 2023
The digital reconstruction of neurocranial endocasts has elucidated the gross brain structure and potential ecological attributes of many fossil taxa, including Irritator, a spinosaurine spinosaurid from the “mid” Cretaceous (Aptian) of Brazil.
C. Barker, D. Naish, Jacob Trend, Lysanne V Michels, L. Witmer, Ryan Ridgley, Katy Rankin, C. Clarkin, Philipp Schneider, N. J. Gostling   +9 more
semanticscholar   +2 more sources

Dinosaur teeth from the Lower Cretaceous Jiufotang Formation of western Liaoning, China [PDF]

PeerJ
Here, two dinosaur teeth are discovered from the Lower Cretaceous Jiufotang Formation in Longcheng, Chaoyang, western Liaoning, China. This discovery marks a new fossil site for the Jehol Biota, characterized by three-dimensionally preserved fossils ...
Ya-Lei Yin, Yang Li, Jin Hu, Hong-Gang Zhang   +3 more
doaj   +3 more sources

Abelisauroidea (Theropoda, Dinosauria) from Africa: a review of the fossil record [PDF]

Papéis Avulsos de Zoologia, 2023
The Continental African abelisauroid theropod dinosaur fossil record from the Jurassic-Cretaceous periods is becoming increasingly better understood, and offers great insight into the evolution and biogeography of this long-lived group of carnivores ...
André Luis de Souza-Júnior, Carlos Roberto dos Anjos Candeiro, Luciano da Silva Vidal, Stephen Louis Brusatte, Mickey Mortimer   +4 more
doaj   +2 more sources