Results 81 to 90 of about 7,261 (219)

A king-sized theropod coprolite [PDF]

Nature, 1998
Fossil faeces (coprolites) provide unique trophic perspectives on ancient ecosystems. Yet, although thousands of coprolites have been discovered, specimens that can be unequivocally attributed to carnivorous dinosaurs are almost unknown. A few fossil faeces have been ascribed to herbivorous dinosaurs1,2,3, but it is more difficult to identify ...
Karen Chin, Timothy T. Tokaryk, Gregory M. Erickson, Lewis C. Calk   +3 more
openaire   +1 more source

Osteohistology of two phorusrhacids reveals uninterrupted growth strategy

The Anatomical Record, EarlyView.
Abstract Phorusrhacidae were apex predators that primarily dominated South America ecosystems for at least 40 million years with their imposing size and predatory lifestyle—yet some aspects of their biology remain poorly understood. Osteohistology is a tool for understanding growth dynamics and biomechanical adaptations.
Lotta Dreyer, Christian Cooper, Jingmai O'Connor   +2 more
wiley   +1 more source

Taxonomic and stratigraphic update of the material historically attributed to Megalosaurus from Portugal [PDF]

Acta Palaeontologica Polonica
The first paleontological works on Mesozoic vertebrates from Portugal, carried out from the end of the 19th and the first half of the 20th century, provided the discovery of significant collections of vertebrate fossils.
Elisabete Malafaia, Pedro Mocho, Fernando Escaso, Ivan Narvaéz, Francisco Ortega   +4 more
doaj   +1 more source

Ichnological evidence of Megalosaurid Dinosaurs crossing Middle Jurassic tidal flats [PDF]

, 2016
A new dinosaur tracksite in the Vale de Meios quarry (Serra de Aire Formation, Bathonian, Portugal) preserves more than 700 theropod tracks. They are organized in at least 80 unidirectional trackways arranged in a bimodal orientation pattern (W/NW and E ...
Castanera, D., Faria dos Santos, Vanda, Galobart, Àngel, Oms, O., Razzolini, Novella L., Vila Ginestí, Bernat   +5 more
core   +5 more sources

Nasal soft‐tissue anatomy of Triceratops and other horned dinosaurs

The Anatomical Record, EarlyView.
Abstract Although ceratopsid dinosaurs possess a characteristically hypertrophied narial region, soft‐tissue anatomy associated with such a skeletal structure and their biological significance remain poorly understood. The present study provides the first comprehensive hypothesis on the soft‐tissue anatomy in the ceratopsid rostrum based on the Extant ...
Seishiro Tada, Takanobu Tsuihiji, Hiroki Ishikawa, Noriyuki Wakimizu, Soichiro Kawabe, Kodai Sakane   +5 more
wiley   +1 more source

Don't break a leg: Running birds from quail to ostrich prioritise leg safety and economy in uneven terrain [PDF]

, 2009
Cursorial ground birds are paragons of bipedal running that span a 500-fold mass range from quail to ostrich. Here we investigate the task-level control priorities of cursorial birds by analysing how they negotiate single-step obstacles that create a ...
Birn-Jeffery, A V, Blum, Y, Daley, M A, Hubicki, C M, Hurst, J W, Oregon State University, Renjewski, D   +6 more
core   +4 more sources

Inter‐ and intraspecific variation in theropod dinosaur dental microwear and its palaeoecological implications

The Anatomical Record, EarlyView.
Abstract Differences in skull and tooth morphology, stomach contents, and estimated bite force between medium‐to‐large sized (≥100 kg) predatory theropod dinosaurs have long been suspected to correlate with differences in their diets and dietary guilds (e.g., hypercarnivory, piscivory).
Cassius Morrison, James Gregory, Christopher Jackson, Jordan Bestwick, Katlin Schroeder, Samuel J.L. Gascoigne, Paul Bills, Laura B. Porro, Philip D. Mannion, Paul M. Barrett   +9 more
wiley   +1 more source

Multivariate analyses of small theropod dinosaur teeth and implications for paleoecological turnover through time.

PLoS ONE, 2013
Isolated small theropod teeth are abundant in vertebrate microfossil assemblages, and are frequently used in studies of species diversity in ancient ecosystems. However, determining the taxonomic affinities of these teeth is problematic due to an absence
Derek W Larson, Philip J Currie
doaj   +1 more source

Nuclear preservation in the cartilage of the Jehol dinosaur Caudipteryx

Communications Biology, 2021
Zheng et al. report on the presence of nuclear preservation in the femoral cartilage of a specimen of Caudipteryx, a theropod dinosaur. They identify the presence of chromatin threads for only the second time in any vertebrate fossil.
Xiaoting Zheng, Alida M. Bailleul, Zhiheng Li, Xiaoli Wang, Zhonghe Zhou   +4 more
doaj   +1 more source

Elliptic Fourier analysis as a tool for the taxonomic identification of isolated theropod pedal phalanges

The Anatomical Record, EarlyView.
Abstract Studies of Upper Cretaceous deposits in North America have provided invaluable insights into the continental ecosystems of this time. Theropod (Saurischia, Dinosauria) pedal phalanges are commonplace in these deposits but can be difficult to identify at a finer taxonomic resolution.
Trystan M. Warnock‐Juteau, Stephanie M. Smith, Thomas M. Cullen   +2 more
wiley   +1 more source