Results 51 to 60 of about 352 (132)

The evolution of femoral morphology in giant non-avian theropod dinosaurs. [PDF]

Paleobiology
International audienceAbstract Theropods are obligate bipedal dinosaurs that appeared 230 Ma and are still extant as birds. Their history is characterized by extreme variations in body mass, with gigantism evolving convergently between many lineages ...
Pintore R, Hutchinson JR, Bishop PJ, Tsai HP, Houssaye A.   +4 more
europepmc   +2 more sources

A Jurassic avialan dinosaur from China resolves the early phylogenetic history of birds

, 2013
The recent discovery of small paravian theropod dinosaurs with well-preserved feathers in the Middle–Late Jurassic Tiaojishan Formation of Liaoning Province (northeastern China) has challenged the pivotal position of Archaeopteryx regarded from its ...
Escuillie, F., François Escuillié, Pascal Godefroit, Wu, Wenhao, Andrea Cau, Dyke, G.J., CAU, ANDREA, Dong-Yu, H., Hu, Dong Yu, Gareth, Dyke, Gareth Dyke, François, Escuillié, Hu Dong-Yu, Wu Wenhao, Cau, A., Wenhao, W., Godefroit, P., Pascal, Godefroit   +17 more
core   +1 more source

New perspectives on body size and shape evolution in dinosaurs

Biological Reviews, Volume 100, Issue 5, Page 1829-1860, October 2025.
ABSTRACT Diversity in the body shapes and sizes of dinosaurs was foundational to their widespread success during the Mesozoic era. The ability to quantify body size and form reliably is therefore critical to the study of dinosaur biology and evolution.
Matthew Dempsey, Samuel R. R. Cross, Susannah C. R. Maidment, John R. Hutchinson, Karl T. Bates   +4 more
wiley   +1 more source

Avialan status for Oviraptorosauria [PDF]

, 2002
Oviraptorosauria is a clade of Cretaceous theropod dinosaurs of uncertain affinities within Maniraptoriformes. All previous phylogenetic analyses placed oviraptorosaurs outside a close relationship to birds (Avialae), recognizing Dromaeosauridae or ...
Osmolska, H., Wolsan, M., Maryanska, T
core  

Skull morphology and histology indicate the presence of an unexpected buccal soft tissue structure in dinosaurs

Journal of Anatomy, Volume 247, Issue 3-4, Page 790-818, September/October 2025.
A combined approach of osteology and histology was used to examine the cheek regions of dinosaurs. Strong evidence was found for a soft tissue in this region connecting the zygoma to the mandible, here named the ‘exoparia’. Abstract Unlike mammals, reptiles typically lack large muscles and ligaments that connect the zygoma to the mandible.
Henry S. Sharpe, Yan‐yin Wang, Thomas W. Dudgeon, Mark J. Powers, S. Amber Whitebone, Colton C. Coppock, Aaron D. Dyer, Corwin Sullivan   +7 more
wiley   +1 more source

Fig. 76. Results from exploratory phylogenetic analysis including Epidendrosaurus ningchengensis. A, reduced strict consensus cladogram. B in A Review Of Dromaeosaurid Systematics And Paravian Phylogeny

, 2012
Fig. 76. Results from exploratory phylogenetic analysis including Epidendrosaurus ningchengensis. A, reduced strict consensus cladogram. B, detail of the base of Avialae showing the number of additional steps required to constrain Epidendrosaurus and ...
Makovicky, Peter J., Norell, Mark A., Turner, Alan H.   +2 more
core   +1 more source

Paleoneurology of stem palaeognaths clarifies the plesiomorphic condition of the crown bird central nervous system

Journal of Morphology, Volume 285, Issue 6, June 2024.
We describe the nearly complete digital endocasts of the brain and bony labyrinth of the neotype specimen of Lithornis vulturinus, a palaeognathous bird from the early Eocene of Europe. Lithornis may provide the clearest insights to date into the neuroanatomy of the ancestral crown bird, combining an ancestrally unflexed brain with a caudally oriented ...
Klara E. Widrig, Guillermo Navalón, Daniel J. Field   +2 more
wiley   +1 more source

Patterns of variation in fleshy diaspore size and abundance from Late Triassic–Oligocene

Biological Reviews, Volume 99, Issue 2, Page 430-457, April 2024.
ABSTRACT Vertebrate‐mediated seed dispersal is a common attribute of many living plants, and variation in the size and abundance of fleshy diaspores is influenced by regional climate and by the nature of vertebrate seed dispersers among present‐day floras.
Duhita Naware, Roger Benson
wiley   +1 more source

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.
Piatnitzkysauridae were Jurassic theropods that represented one of the earliest lineages to have evolved moderate body size. Here, we reconstructed the hindlimb musculature of this clade, allowing a more complete understanding of myological evolution in theropod pelvic appendages. Abstract Piatnitzkysauridae were Jurassic theropods that represented the
Mauro B. S. Lacerda, Jonathas S. Bittencourt, John R. Hutchinson   +2 more
wiley   +1 more source

MPM-334-1: Fossil basicranium and endocranial volumes and CT-stack (Enantiornithes, Avialae)

, 2023
Among terrestrial vertebrates, only crown birds (Neornithes) rival mammals in terms of relative brain size and behavioural complexity. Relatedly, the anatomy of the avian central nervous system and associated sensory structures, such as the vestibular ...
Chiappe, Luis M., Field, Daniel J., Nava, William, Martinelli, Agustín, Navalón, Guillermo   +4 more
core   +1 more source