Project 2149: E. M. Hughes, J. R. Wible, M. Spaudling, Z.-X. Luo. 2015. Mammalian Petrosal From The Upper Jurassic Morrison Formation Of Fruita, Colorado. Annals of the Carnegie Museum. 83 (1):1-17.


A partial petrosal from the Upper Jurassic Morrison Formation of the Fruita Paleontological Area of western Colorado preserving the pars cochlearis and part of the pars canalicularis is described. The endocast of the inner ear showing the cochlea, vestibule, lateral semicircular canal, and the terminal ends of the anterior and posterior semicircular canals is reconstructed from µCT scans. This specimen is only the fourth petrosal known from the Morrison Formation. Mammals known from Fruita include Fruitafossor windsheffeli Luo and Wible, 2005, the triconodontid Priacodon fruitaensis Rasmussen and Callison, 1981, the plagiaulacoid multituberculate Glirodon grandis Engelmann and Callison, 1999, and unnamed spalacotheriids and dryolestoids. The partial petrosal and its endocast share significant features with dryolestoids from the Upper Jurassic of Guimarota, Portugal, including a separate fenestra cochleae and cochlear canaliculus, and a cochlea that is coiled more than 200°. In light of these similarities, the Fruita petrosal is assigned to Dryolestoidea.

Read the article »

Article DOI: 10.2992/007.083.0101

Project DOI: 10.7934/P2149,
This project contains
  • 6 Media
  • 1 Taxon
  • 1 Specimen
Total size of project's media files: 351.3M

Download Project SDD File
Currently Viewing:
MorphoBank Project 2149

    Authors' Institutions

    • Purdue University

    • University of Chicago

    • Carnegie Mellon University

    • Carnegie Museum of Natural History


    member name taxa specimens media media
    John Wible
    Project Administrator
    MorphoBank Curator
    Full membership
    Elijah Hughes
    Full membership
    Zhe-Xi Luo
    Full membership
    Michelle Spaulding
    Full membership

    Project has no matrices defined.

    Project views

    type number of views Individual items viewed (where applicable)
    Total project views15380
    Project overview3370
    Media views7894Media search (4161 views); M377159 (620 views); M377162 (591 views); M376879 (613 views); M377160 (629 views); M377155 (663 views); M377161 (617 views);
    Specimen list1606
    Taxon list1635

    Project downloads

    type number of downloads Individual items downloaded (where applicable)
    Total downloads from project350
    Media downloads5M377159 (1 download); M376879 (2 downloads); M377155 (2 downloads);
    Project downloads345