Results 31 to 40 of about 2,363 (235)

New theropod (Tetanurae: Avetheropoda) material from the ‘mid’-Cretaceous Griman Greek Formation at Lightning Ridge, New South Wales, Australia [PDF]

open access: yesRoyal Society Open Science, 2019
The limited fossil record of Australian Cretaceous theropods is dominated by megaraptorids, reported from associated and isolated material from the Early Cretaceous of Victoria and the ‘Mid’-Cretaceous of central-north New South Wales and central ...
Tom Brougham   +2 more
doaj   +1 more source

Natural Frequency Method: estimating the preferred walking speed of Tyrannosaurus rex based on tail natural frequency

open access: yesRoyal Society Open Science, 2021
Locomotor energetics are an important determinant of an animal's ecological niche. It is commonly assumed that animals minimize locomotor energy expenditure by selecting gait kinematics tuned to the natural frequencies of relevant body parts.
Pasha A. van Bijlert   +2 more
doaj   +1 more source

A Carcharodontosaurid tooth from the Hasandong Formation (Lower Cretaceous) of South Korea

open access: yesMongolian Geoscientist, 2020
A large tooth of theropod dinosaur that was recovered from the Hasandong Formation (Lower Cretaceous; Aptian-Albian) in Daedo island, Hadong Couty, South Gyeongsang Province of South Korea is redescribed.
Chan-gyu Yun
doaj   +1 more source

Bite and tooth marks on sauropod dinosaurs from the Morrison Formation [PDF]

open access: yesPeerJ, 2023
Tooth-marked bones provide important evidence for feeding choices made by extinct carnivorous animals. In the case of the dinosaurs, most bite traces are attributed to the large and robust osteophagous tyrannosaurs, but those of other large carnivores ...
Roberto Lei   +5 more
doaj   +2 more sources

A diverse Late Cretaceous vertebrate tracksite from the Winton Formation of Queensland, Australia [PDF]

open access: yesPeerJ, 2021
The Upper Cretaceous ‘upper’ Winton Formation of Queensland, Australia is world famous for hosting Dinosaur Stampede National Monument at Lark Quarry Conservation Park, a somewhat controversial tracksite that preserves thousands of tridactyl dinosaur ...
Stephen F. Poropat   +7 more
doaj   +2 more sources

Exceptional preservation of tracheal rings in a glyptodont mammal from the Late Pleistocene of Argentina [PDF]

open access: yesActa Palaeontologica Polonica, 2020
Exceptionally well-preserved material from a fossil mammal is presented. For the first time, several fragments of tracheal rings and cricoid cartilage assigned to Panochthus sp.
Martín Zamorano
doaj   +1 more source

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

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