Results 11 to 20 of about 105 (91)
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
A new specimen of Microraptor (Theropoda, Dromaeosauridae) from the Lower Cretaceous of western Liaoning, China. (American Museum novitates, no. 3821) [PDF]
, 2014 28 pages : illustrations (chiefly color) ; 26 cm.Microraptor zhaoianus is known from several specimens collected in western Liaoning Province, China.
Norell, Mark. +11 more
core +2 more sources
Paravian Phylogeny and the Dinosaur-Bird Transition: An Overview
Frontiers in Earth Science, 2019 Recent years witnessed the discovery of a great diversity of early birds as well as closely related non-avian theropods, which modified previous conceptions about the origin of birds and their flight. We here present a review of the taxonomic composition
Federico L. Agnolin +10 more
doaj +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
Potential for Powered Flight Neared by Most Close Avialan Relatives, but Few Crossed Its Thresholds [PDF]
, 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 ...
Goloboff, PA +23 more
core +1 more source
Revision of the Deinonychosauria (Dinosauria, Theropoda) from Argentina: anatomy and phylogeny [PDF]
, 2014 Deinonychosauria es un grupo de dinosaurios terópodos celurosaurios, con un dígito pedal II con capacidad de hiperextensión, entre otros rasgos. Los registros son mayormente del hemisferio norte, aunque también existen registros del hemisferio sur.
Gianechini, Federico Abel
core +1 more source
, 2020 New and important pennaraptoran specimens continue to be discovered on a regular basis. Yet, with these discoveries the number of viable phylogenetic hypotheses has increased, including ones that challenge the traditional exclusive grouping of ...
Pittman, M +6 more
core +3 more sources
Archaeopteryx, paravian phylogenetic analyses, and the use of probability-based methods for palaeontological datasets [PDF]
, 2013 Archaeopteryx, which has often been considered the earliest avialan, is an iconic species, central to our understanding of bird origins. However, a recent parsimony-based phylogenetic study shifted its position from within Avialae, the group that ...
Xu, X., Pol, Diego
core +1 more source
Baraminological Analysis of Jurassic and Cretaceous Avialae [PDF]
, 2020 The baraminic status of Jurassic and Cretaceous Avialae was evaluated using statistical baraminology. Baraminic distance correlation (BDC) and three dimensional multidimensional scaling (MDS) was applied to six previously published character matrices ...
Garner, Paul A. +2 more
core
, 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