Project 2651: M. G. Baron, D. B. Norman, P. M. Barrett. 2017. A new hypothesis of dinosaur relationships and early dinosaur evolution. Nature. 543:501-506.
Specimen: † Herrerasaurus (unvouchered)
View: skeleton


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 study has found a sister-group relationship between Ornithischia and Theropoda (united in the new clade Ornithoscelida), with Sauropodomorpha and Herrerasauridae (as the redefined Saurischia) forming its monophyletic outgroup. This new tree topology requires redefinition and rediagnosis of Dinosauria and the subsidiary dinosaurian clades. In addition, it forces re-evaluations of early dinosaur cladogenesis and character evolution, suggests that hypercarnivory was acquired independently in herrerasaurids and theropods, and offers an explanation for many of the anatomical features previously regarded as notable convergences between theropods and early ornithischians.

Read the article »

Article DOI: doi:10.1038/nature21700

Project DOI: 10.7934/P2651,
This project contains
  • 2 Media
  • 2 Documents
  • 13 Taxa
  • 2 Specimens
Total size of project's media files: 2 MB

Download Project SDD File
Currently Viewing:
MorphoBank Project 2651
  • Creation Date:
    03 April 2017
  • Publication Date:
    03 April 2017
  • Project views: 6622


    member name taxa specimens media
    MorphoBank Curator
    Project Administrator
    Last logged in 04/03/17

    Project has no matrices defined.

    Project views

    type number of views Individual items viewed (where applicable)
    Total project views6622
    Project overview916
    Documents list435
    Media views1657Media search (1044 views); M437932 (290 views); M437931 (323 views);
    Specimen list647
    Taxon list2384
    Views for media list348

    Project downloads

    type number of downloads Individual items downloaded (where applicable)
    Total downloads from project85
    Document downloads7matrix (6 downloads); Characters (1 download);
    Project downloads78