Results 11 to 20 of about 95 (85)
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
, 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
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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
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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
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Anatomía comparada de los terópodos paravianos Unenlagiidae y sus implicancias en el origen de las aves [PDF]
, 2023 Paraves es el clado de dinosaurios que cuenta con mayor número de especies, ya que por un lado agrupa a terópodos no-avianos extintos como Troodon y Velociraptor, y por otro lado a las aves, únicos dinosaurios vivientes (Avialae: Dinosauria, Gauthier ...
Motta, Matías Javier
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, 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, EarlyView.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
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