Results 71 to 80 of about 4,308 (203)
The Anatomical Record, EarlyView.Abstract The upper carbonate concretion levels of the Romualdo Formation (Aptian, Brazil) have yielded several theropod dinosaur remains, including spinosaurids and the coelurosaurs Santanaraptor placidus and Mirischia asymmetrica, the phylogenetic affinities of which are controversial.
Rafael Delcourt +4 more
wiley +1 more source
Hox Genes, Digit Identities and the Theropod/Bird Transition [PDF]
, 2005 Vargas and Fallon (2005) propose that Hox gene expression patterns indicate that the most anterior digit in bird wings is homologous to digit 1 rather than to digit 2 in other amniotes. This interpretation is based on the presence of Hoxd13 expression in
Galis, F., Kundrat, M., Metz, J.A.J.
core +1 more source
The Anatomical Record, EarlyView.Abstract Pterosaur dental biology remains poorly understood despite its importance for comprehending feeding strategies and flight adaptations. Here, we present the first comprehensive histological analysis of an ornithocheiriform pterosaur tooth from the Lower Cretaceous Crato Formation (Santana Group, Northeast Brazil).
Tito Aureliano +3 more
wiley +1 more source
The anatomy of Dryptosaurus aquilunguis (Dinosauria:Theropoda) and a review of its tyrannosauroid affinities [PDF]
, 2011 no ...
Benson, R.B.J. +2 more
core +2 more sources
The Anatomical Record, EarlyView.Osteohistological sampling on different bones of theropod dinosaur documents discrepant age record, growth, and metabolism. This could result unprecise paleobiological inferences if samplings are based on single bones. However, multi‐bone sampling can attenuate these discrepancies, helping to infer growth dynamics and physiology of these extinct ...
Geovane Alves de Souza +3 more
wiley +1 more source
Feeding mechanics in spinosaurid theropods and extant crocodilians.
PLoS ONE, 2013 A number of extant and extinct archosaurs evolved an elongate, narrow rostrum. This longirostrine condition has been associated with a diet comprising a higher proportion of fish and smaller prey items compared to taxa with broader, more robust snouts ...
Andrew R Cuff, Emily J Rayfield
doaj +1 more source
Unusual pectoral apparatus in a predatory dinosaur resolves avian wishbone homology
Scientific Reports, 2021 The furcula is a distinctive element of the pectoral skeleton in birds, which strengthens the shoulder region to withstand the rigor of flight. Although its origin among theropod dinosaurs is now well-supported, the homology of the furcula relative to ...
Andrea Cau +4 more
doaj +1 more source
_Limusaurus_ and bird digit identity [PDF]
, 2009 _Limusaurus_ is a remarkable herbivorous ceratosaur unique among theropods in having digits II, III and IV, with only a small metacarpal vestige of digit I. This raises interesting questions regarding the controversial identity of avian wing digits.
Alexander O. Vargas +2 more
core +1 more source
Functional aspects of titanosaur osteoderms [PDF]
, 2007 Though titanosaur osteoderms are not common findings, these elements are recorded widely in Gondwana and part of Laurasia. This assembly known by the date offers few resources for studies on the ecology of this group of dinosaurs.
Thiago S. Marinho
core +2 more sources
Extreme Ontogenetic Changes in a Ceratosaurian Theropod [PDF]
Current Biology, 2017 Ontogenetic variation is documented within many dinosaur species, but extreme ontogenetic changes are rare among dinosaurs, particularly among theropods. Here, we analyze 19 specimens of the Jurassic ceratosaurian theropod Limusaurus inextricabilis, representing six ontogenetic stages based on body size and histological data.
Wang, Shuo +6 more
openaire +4 more sources