Corosaurus alcovensis Case and the phylogenetic interrelationships of Triassic stem-group Sauropterygia

Authors

  • OLIVIER RIEPPEL

    Corresponding author
    1. Department of Geology, The Field Museum, Roosevelt Rd. at Lake Shore Dr. Chicago, IL 60605-2496, U.S.A.
      E-mail: rieppel@fmppr.fmnh.org
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E-mail: rieppel@fmppr.fmnh.org

Abstract

The holotype and other material of Corosaurus alcovensis Case from the Alcova Limestone of Casper, Wyoming, was further prepared using a combination of chemical techniques. Anatomical revision resulted in the definition of new characters for the analysis of the phylogenetic interrelationships of Triassic stem-group Sauropterygia that document paraphyly of the Eusauropterygia. Corosaurus is the sister-taxon to a clade comprising Cymatosaurus, Pistosaurus, and by extension, plesiosaurs and pliosaurs.

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