Results 281 to 290 of about 99,859 (391)

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

Journal of Anatomy, EarlyView.
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

New fossils imply a deeper origin of modern birds in the Mesozoic. [PDF]

Natl Sci Rev
Wu S, Tao Z, Liu L, Marshall CR, Edwards SV, Zhou Z, Rheindt FE.   +6 more
europepmc   +1 more source

Osteohistological analysis of metatarsals reveals new information on pathology and life history of troodontids from the Campanian Dinosaur Park Formation, Alberta, Canada

Journal of Anatomy, EarlyView.
A histological survey of troodontid metatarsals from the Dinosaur Park Formation (DPF) was conducted, revealing correlates for stresses in the troodontid arctometatarsus and providing the first histological assessment of pathologies for this taxon.
Christiana W. Garros, Mark J. Powers, Aaron D. Dyer, Philip J. Currie   +3 more
wiley   +1 more source

Fossil eggshell diversity of the Mussentuchit Member, Cedar Mountain Formation, Utah. [PDF]

PLoS One
Hedge J, Tucker RT, Makovicky PJ, Zanno LE.   +3 more
europepmc   +1 more source

The Geology of Minnesota. Vol. 3, Paleontology

, 1895
Léo Lesquereux, Erhard Ulrich
openalex   +2 more sources

Novel report of an osteogenic tumor in a late Jurassic Mamenchisaurid from Thailand

Journal of Anatomy, EarlyView.
Here we describe a pathology in an ulna of a Late Jurassic mamenchisaurid from Thailand. We use anatomical descriptions, CT scanning, and bone histology to identify the pathology as an osteogenic tumor. Abstract Here we report on an osseous abnormality and multiple fractures in an ulna of a subadult basal Eusauropod (Mamenchisauridae) from the Late ...
Siripat Kaikaew, Suravech Suteethorn, Anusuya Chinsamy   +2 more
wiley   +1 more source

Jurassic fish choking on floating belemnites. [PDF]

Sci Rep
Ebert M, Kölbl-Ebert M.
europepmc   +1 more source

Multiple developmental origins of the avian propatagial muscle and their evolutionary implications

Journal of Anatomy, EarlyView.
Through the analyses on the developmental process of forelimb muscles in the chicken and outgroup taxa, we found that the avian propatagial muscle developed from multiple cell masses derived from parts of the developing forelimb muscles, in association with the hypertrophied dermis along the cranial edge of the developing propatagium.
Yurika Uno, Tatsuya Hirasawa
wiley   +1 more source

A possible later stone age painting of a dicynodont (Synapsida) from the South African Karoo. [PDF]

PLoS One
Benoit J.
europepmc   +1 more source

Almost billfish: convergent longirostry, micro‐dentition, and possible glandular sinuses in a large teleost fish from the Upper Cretaceous of Northern Italy

Journal of Anatomy, EarlyView.
A fossil rostrum fragment of a large teleost fish from the Upper Cretaceous of Northern Italy reveals remarkable anatomical convergences with Cenozoic and Recent billfishes (marlins, swordfishes, and akin). The extinct group Plethodidae independently acquired a long snout, micro‐teeth, and oil‐gland sinuses well before the evolution of true billfishes.
Giovanni Serafini, Jürgen Kriwet, Tommaso Toldo, Eliana Fornaciari, Jacopo Amalfitano, Giorgio Carnevale   +5 more
wiley   +1 more source