Results 11 to 20 of about 98 (78)
On the absence of sternal elements in Anchiornis (Paraves) and Sapeornis (Aves) and the complex early evolution of the avian sternum. [PDF]
Proc Natl Acad Sci U S A, 2014 Zheng X +5 more
europepmc +2 more sources
Deinonychosaur trackways in southeastern China record a possible giant troodontid. [PDF]
iScienceSummary The Longxiang tracksite (lower Upper Cretaceous, Shanghang Basin) includes twelve didactyl deinonychosaur tracks that fall into two morphologies, differentiated by both size and form.
Xing L +5 more
europepmc +2 more sources
High rates of evolution preceded the origin of birds. [PDF]
Evolution, 2014 The origin of birds (Aves) is one of the great evolutionary transitions. Fossils show that many unique morphological features of modern birds, such as feathers, reduction in body size, and the semilunate carpal, long preceded the origin of clade Aves ...
Puttick MN, Thomas GH, Benton MJ.
europepmc +2 more sources
Potential for Powered Flight Neared by Most Close Avialan Relatives, but Few Crossed Its Thresholds.
Current Biology, 2020 Uncertainties in the phylogeny of birds (Avialae) and their closest relatives have impeded deeper understanding of early theropod flight. To help address this, we produced an updated evolutionary hypothesis through an automated analysis of the Theropod ...
R. Pei +9 more
semanticscholar +1 more source
Powered flight potential approached by wide range of close avian relatives but achieved selectively
bioRxiv, 2020 Evolution of birds from non-flying theropod dinosaurs is a classic evolutionary transition, but a deeper understanding of early flight has been frustrated by disagreement on the relationships between birds (Avialae) and their closest theropod relatives ...
R. Pei +9 more
semanticscholar +1 more source
The impact of poor sampling of polymorphism on cladistic analysis
Cladistics, Volume 32, Issue 3, Page 317-334, June 2016., 2016 Abstract Despite its ubiquity in the natural world, polymorphism is commonly disregarded or poorly sampled in phylogenetic analyses due to deliberate sampling strategy, inadequate sampling effort and limited specimen availability. Poor sampling of intraspecific variation engenders differential sampling of morphs within polymorphic species, which could ...
Akinobu Watanabe
wiley +1 more source
, 2014 Microraptor zhaoianus is known from several specimens collected in western Liaoning Province, China. However, several aspects of the morphology of Microraptor remain unknown or ambiguous due to poor preservation of the described specimens.
R. Pei +4 more
semanticscholar +1 more source
New Specimens of Microraptor zhaoianus (Theropoda: Dromaeosauridae) from Northeastern China
, 2002 New specimens of the diminutive theropod dinosaur Microraptor zhaoianus are described. These specimens preserve significant morphological details that are not present or are poorly preserved in the holotype specimen, including aspects of the manus ...
Sunny H. Hwang +3 more
semanticscholar +1 more source
, 2023 We studied an assemblage of teeth from Laje do Coringa, São Luís-Grajaú Basin, Alcântara Formation, State of Maranhão, Brazil. The collection sites are dated as Albian–Cenomanian. Ten teeth were submitted to morphological analysis in Scanning Electron Microscopy, with the goal of identifying materials likely associated with unenlagiine theropod ...
Letizio, Luiz Antonio +2 more
openaire +2 more sources
Diet of bird‐like troodontid dinosaurs: synthesis of a contentious clade
Biological Reviews, Volume 101, Issue 4, Page 1760-1778, August 2026.ABSTRACT Troodontidae is a clade of small‐to medium‐sized maniraptoran theropods that mainly lived in Laurasia (modern Asia, North America and Europe) during the Jurassic and Cretaceous periods and are believed to have had a variety of diets. The uniqueness of troodontid teeth suggests that they diverged from the typical flesh‐based diet of non‐avian ...
Yui Chi Fan +2 more
wiley +1 more source