Read e-book online Avian Ancestors: A Review of the Phylogenetic Relationships PDF

By Federico Agnolin,Fernando E. Novas

even supposing consensus exists between researchers that birds developed from coelurosaurian theropods, paleontologists nonetheless debate the identity of the crowd of coelurosaurians that the majority heavily techniques the typical ancestor of birds. The final two decades witnessed the invention of a big selection of avian-like theropods that has significantly amplified the anatomical disparity between deinonychosaurians, a few of which resemble Archaeopteryx greater than Deinonychus. between those newly came across theropods that convey amazing bird-like features are the four-winged theropods Microraptor and Anchiornis, and the unenlagiids Unenlagia, Buitreraptor, and Rahonavis. A weird and wonderful crew of minute-sized coelurosaurs, the Scansoriopterygidae, additionally shows a few avian similarities that lead a few authors to interpret them as extra heavily relating to birds than different dinosaurs. With the purpose to discover the phylogenetic relationships of those coelurosaurians and birds, we merged lately released integrative databases, leading to major alterations within the topological distribution of taxa inside Paraves. We current proof that Dromaeosauridae, Microraptoria, Unenlagiidae, and Anchiornis + Xiaotingia shape successive sister taxa of Aves, and that the Scansoriopterygidae are basal coelurosaurians no longer heavily on the topic of birds. the results within the evolutionary series of anatomical characters resulting in birds, together with the starting place of flight, also are thought of in mild of this new phylogenetic hypothesis.

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Avian Ancestors: A Review of the Phylogenetic Relationships of the Theropods Unenlagiidae, Microraptoria, Anchiornis and Scansoriopterygidae (SpringerBriefs in Earth System Sciences) by Federico Agnolin,Fernando E. Novas


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