Results 31 to 40 of about 3,472 (207)

A reassessment of the taxonomic validity of Dynamoterror dynastes (Theropoda: Tyrannosauridae)

open access: yesZoodiversity, 2020
Associated fragmentary materials of tyrannosaurid theropod, Dynamoterror dynastes McDonald et al., 2018, were reported in 2018 from the Upper Cretaceous Menefee Formation of New Mexico. However, two originally proposed autapomorphies (i.e. prefrontonasal
Chan-gyu Yun
doaj   +1 more source

Multiple optimality criteria support Ornithoscelida [PDF]

open access: yesRoyal Society Open Science, 2017
A recent study of early dinosaur evolution using equal-weights parsimony recovered a scheme of dinosaur interrelationships and classification that differed from historical consensus in a single, but significant, respect; Ornithischia and Saurischia were ...
Luke A. Parry   +2 more
doaj   +1 more source

Osteology of Khaan mckennai (Oviraptorosauria: Theropoda) [PDF]

open access: yesBulletin of the American Museum of Natural History, 2012
ABSTRACT The monophyly of Oviraptoridae, a group of theropod dinosaurs, which share a uniquely bizarre morphology, has never been called into question due in large part to their unusual complex of characters. Despite a vivid recent history of discovery and broad public appeal the nature of their morphological diversity has not been explored extensively.
Amy M. Balanoff, Mark A. Norell
openaire   +1 more source

New mid-cervical vertebral morphotype of Spinosauridae from the Kem Kem Group of Morocco

open access: yesVertebrate Anatomy, Morphology, Palaeontology, 2021
An unusual mid-cervical vertebra belonging to a large spinosaurid from the Cenomanian Kem Kem Group of Morocco is described. It is compared to the characteristic morphology of each reconstructed cervical position in Spinosaurus aegyptiacus, based on a ...
Bradley McFeeters
doaj   +1 more source

A new dromaeosaurid (Dinosauria: Theropoda) from the Upper Cretaceous Wulansuhai Formation of Inner Mongolia, China [PDF]

open access: yes, 2010
We describe a new dromaeosaurid theropod from the Upper Cretaceous Wulansuhai Formation of Bayan Mandahu, Inner Mongolia. The new taxon, Linheraptor exquisitus gen. et sp.
Choiniere, J.N.   +10 more
core   +1 more source

A large abelisaurid (Dinosauria, Theropoda) from Morocco and comments on the Cenomanian theropods from North Africa [PDF]

open access: yesPeerJ, 2016
We describe the partially preserved femur of a large-bodied theropod dinosaur from the Cenomanian “Kem Kem Compound Assemblage” (KKCA) of Morocco. The fossil is housed in the Museo Geologico e Paleontologico “Gaetano Giorgio Gemmellaro” in Palermo (Italy)
Alfio Alessandro Chiarenza, Andrea Cau
doaj   +2 more sources

The body plan of Halszkaraptor escuilliei (Dinosauria, Theropoda) is not a transitional form along the evolution of dromaeosaurid hypercarnivory [PDF]

open access: yesPeerJ, 2020
The dromaeosaurid theropod Halszkaraptor escuilliei is characterized by several unusual features absent in other paravians, part of which has been interpreted as diagnostic of a novel lineage adapted to a semiaquatic ecology. Recently, these evolutionary
Andrea Cau
doaj   +2 more sources

A reassessment of Kelmayisaurus petrolicus, a large theropod dinosaur from the Early Cretaceous of China [PDF]

open access: yes, 2012
The Early Cretaceous fossil record of large−bodied theropods from Asia is poor, hindering comparison of Asian predatory dinosaur faunas with those from other continents. One of the few large Asian theropod specimens from this interval is a partial skull (
Allain R.   +37 more
core   +1 more source

Ontogeny and miniaturization of Alvarezsauridae (Dinosauria, Theropoda)

open access: yesBiological Communications, 2023
The ontogenetic status of the known specimens of alvarezsaurid theropod dinosaurs is revised. We present histological data that the holotype of Parvicursor remotus from the Upper Cretaceous Barungoyot Formation of Mongolia is not an adult individual, as previously thought, but a juvenile less than one year old.
Alexander Averianov   +2 more
openaire   +1 more source

Assesment and interpretation of negative forelimb allometry in the evolution of non-avian Theropoda

open access: yesFrontiers in Zoology, 2019
Background The origin of birds is marked by a significant decrease in body size along with an increase in relative forelimb size. However, before the evolution of flight, both traits may have already been related: It has been proposed that an ...
José A. Palma Liberona   +3 more
doaj   +1 more source

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