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.


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Project DOI: 10.7934/P552, http://dx.doi.org/10.7934/P552
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MorphoBank Project 552

    Authors' Institutions

    • The University of Bristol

    • Universidade de Sao Paulo

    • Bayerische Staatssammlung fuer Palaeontologie und Geologie



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    MorphoBank Curator
    Project Administrator
    Last logged in 08/06/14
    666
    Maureen Admin
    Full membership
    Last logged in 07/27/11
    000
    Stephen Brusatte
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    Last logged in 07/20/11
    000


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