Project 2290: M. J. Orliac, M. A. O'Leary. 2016. The inner ear of Protungulatum (Pan-Euungulata, Mammalia). Journal of Mammalian Evolution:1-16.
Specimen: † Protungulatum sp. (AMNH/VP:AMNH-VP 118359)

Abstract

We present new anatomical details about the bony labyrinth of Protungulatum based on micro CT-scan investigation of an isolated petrosal bone retrieved at the Puercan locality of Bug Creek Anthills and referred to Protungulatum sp. The exceptional state of preservation of the specimen allowed us to reconstruct the very fine details of the inside of the petrosal bone, including the bony labyrinth, the innervation of the vestibule, and the innervation and vasculature of the cochlea. Estimation of the auditory capability of Protungulatum based on cochlear morphology indicate that Protungulatum was specialized for high-frequency hearing, with estimated low frequency limits above 1 KHz. Comparisons with Late Cretaceous non-placental eutherians and with early Tertiary pan-euungulates indicate that the bony labyrinth of Protungulatum is closer in general morphology to Mesozoic forms (low coiling and low aspect ratio of the cochlea, posterior orientation of the common crus, dorsal outpocketing of the cochlear fossula), and shares only a few characters with pan-euungulate and euungulate taxa. Interestingly, the bony labyrinth of Protungulatum also shares some morphological features with South American notoungulates and litopterns recently described from ItaboraĆ­, Brazil. These new observations provide new morphological features of potential phylogenetic interest.


Read the article »

Article DOI: 10.1007/s10914-016-9327-z

Project DOI: 10.7934/P2290, http://dx.doi.org/10.7934/P2290
This project contains
  • 6 Media
  • 1 Document
  • 1 Folio
  • 1 Taxon
  • 1 Specimen
Total size of project's media files: 4 MB

Download Project SDD File
Currently Viewing:
MorphoBank Project 2290

    This research
    supported by



    Members

    member name taxa specimens media media
    notes
    Maeva Orliac
    Project Administrator
    Last logged in 04/08/16
    1160
    Maureen O'Leary
    Full membership
    Last logged in 03/21/16
    0000


    Project has no matrices defined.



    Project views

    type number of views Individual items viewed (where applicable)
    Total project views9467
    Project overview1946
    Documents list935
    Media views3793Media search (2196 views); M402197 (258 views); M402202 (322 views); M402198 (267 views); M402201 (266 views); M402200 (233 views); M402199 (251 views);
    Bibliography443
    Taxon list786
    Folio views624Folio list (454 views); stereoscopic views of vasculature and innervation (170 views);
    Specimen list940




    Project downloads

    type number of downloads Individual items downloaded (where applicable)
    Total downloads from project114
    Project downloads109
    Media downloads4M402199 (1 download); M402197 (2 downloads); M402198 (1 download);
    Document downloads1Online Supplementary material (1 download);