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      A new hypothesis of dinosaur relationships and early dinosaur evolution

      Author(s): , ,  
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      Journal: Nature
      Publisher: Springer Nature

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          Abstract

          For 130 years, dinosaurs have been divided into two distinct clades—Ornithischia and Saurischia. Here we present a hypothesis for the phylogenetic relationships of the major dinosaurian groups that challenges the current consensus concerning early dinosaur evolution and highlights problematic aspects of current cladistic definitions. Our

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          On the Classification of the Fossil Animals Commonly Named Dinosauria

          H. G. Seeley (1887)
          Article 0 comments Cited 270 times – based on 0 reviews     Review now
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            The phylogeny of the ornithischian dinosaurs

            Richard J Butler, Paul Upchurch, David B. Norman (2008)
            Article 0 comments Cited 126 times – based on 0 reviews     Review now
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              Ecologically distinct dinosaurian sister group shows early diversification of Ornithodira.

              Sterling Nesbitt, Christian A. Sidor, Randall B. Irmis … (2010)
              The early evolutionary history of Ornithodira (avian-line archosaurs) has hitherto been documented by incomplete (Lagerpeton) or unusually specialized forms (pterosaurs and Silesaurus). Recently, a variety of Silesaurus-like taxa have been reported from the Triassic period of both Gondwana and Laurasia, but their relationships to each other and to dinosaurs remain a subject of debate. Here we report on a new avian-line archosaur from the early Middle Triassic (Anisian) of Tanzania. Phylogenetic analysis places Asilisaurus kongwe gen. et sp. nov. as an avian-line archosaur and a member of the Silesauridae, which is here considered the sister taxon to Dinosauria. Silesaurids were diverse and had a wide distribution by the Late Triassic, with a novel ornithodiran bauplan including leaf-shaped teeth, a beak-like lower jaw, long, gracile limbs, and a quadrupedal stance. Our analysis suggests that the dentition and diet of silesaurids, ornithischians and sauropodomorphs evolved independently from a plesiomorphic carnivorous form. As the oldest avian-line archosaur, Asilisaurus demonstrates the antiquity of both Ornithodira and the dinosaurian lineage. The initial diversification of Archosauria, previously documented by crocodilian-line archosaurs in the Anisian, can now be shown to include a contemporaneous avian-line radiation. The unparalleled taxonomic diversity of the Manda archosaur assemblage indicates that archosaur diversification was well underway by the Middle Triassic or earlier.
              Article 0 comments Cited 124 times – based on 0 reviews     Review now
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                Author and article information

                Journal
                Title: Nature
                Abbreviated Title: Nature
                Publisher: Springer Nature
                ISSN (Print): 0028-0836
                ISSN (Electronic): 1476-4687
                Publication date Created: March 22 2017
                Publication date (Print): March 22 2017
                Volume: 543
                Issue: 7646
                Pages: 501-506
                Article
                DOI: 10.1038/nature21700
                PubMed ID: 28332513
                SO-VID: 9f4c9a54-b8ab-4c8f-b96c-45accefa3f61
                Copyright © © 2017
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