Project 552: S. L. Brusatte, M. J. Benton, J. B. Desojo, M. C. Langer. 2010. The higher-level phylogeny of Archosauria (Tetrapoda: Diapsida). Journal of Systematic Palaeontology. 8 (1):3-47.
Specimen: † Nicrosaurus (SMNS/Stuttgart:no specimen number)

Abstract

Crown group Archosauria, which includes birds, dinosaurs, crocodylomorphs, and several extinct Mesozoic groups, is a primary division of the vertebrate tree of life. However, the higher-level phylogenetic relationships within Archosauria are poorly resolved and controversial, despite years of study. The phylogeny of crocodile-line archosaurs (Crurotarsi) is particularly contentious, and has been plagued by problematic taxon and character sampling. Recent discoveries and renewed focus on archosaur anatomy enable the compilation of a new dataset, which assimilates and standardizes character data pertinent to higher-level archosaur phylogeny, and is scored across the largest group of taxa yet analysed. This dataset includes 47 new characters (25% of total) and eight taxa that have yet to be included in an analysis, and total taxonomic sampling is more than twice that of any previous study. This analysis produces a well-resolved phylogeny, which recovers mostly traditional relationships within Avemetatarsalia, places Phytosauria as a basal crurotarsan clade, finds a close relationship between Aetosauria and Crocodylomorpha, and recovers a monophyletic Rauisuchia comprised of two major subclades. Support values are low, suggesting rampant homoplasy and missing data within Archosauria, but the phylogeny is highly congruent with stratigraphy. Comparison with alternative analyses identifies numerous scoring differences, but indicates that character sampling is the main source of incongruence. The phylogeny implies major missing lineages in the Early Triassic and may support a Carnian-Norian extinction event.


Read the article »

Project DOI: 10.7934/P552, http://dx.doi.org/10.7934/P552
This project contains
  • 6 Media
  • 3 Documents
  • 6 Taxa
  • 6 Specimens
Total size of project's media files: 527.63k

Download Project SDD File
Currently Viewing:
MorphoBank Project 552

    Authors' Institutions

    • Universidade de Sao Paulo

    • Bayerische Staatssammlung fuer Palaeontologie und Geologie

    • University of Bristol



    Members

    member name taxa specimens media
    MorphoBank Curator
    Project Administrator
    Last logged in 08/06/14
    666
    Maureen Admin
    Full membership
    Last logged in 01/09/20
    000
    Stephen Brusatte
    Full membership
    Last logged in 07/20/11
    000


    Project has no matrices defined.



    Project views

    type number of views Individual items viewed (where applicable)
    Total project views20345
    Project overview2562
    Media views5998Media search (3087 views); M90467 (459 views); M90468 (646 views); M90469 (449 views); M90466 (449 views); M90465 (434 views); M90464 (474 views);
    Specimen list5227
    Taxon list4653
    Bibliography701
    Documents list1204




    Project downloads

    type number of downloads Individual items downloaded (where applicable)
    Total downloads from project201
    Document downloads16Character list (7 downloads); Matrix (9 downloads);
    Media downloads4M90468 (1 download); M90464 (1 download); M90466 (1 download); M90469 (1 download);
    Project downloads181