Project 697: E. R. Seiffert, S. Nasir, A. Al-Harthy, J. R. Groenke, B. P. Kraatz, N. J. Stevens, A. R. Al-Sayigh. 2012. Diversity in the later Paleogene proboscidean radiation: a small barytheriid from the Oligocene of Dhofar Governorate, Sultanate of Oman. Naturwissenschaften: The Science of Nature. 99 (2):133-141.
Specimen: † Omanitherium dhofarensis (SQU:290)

Abstract

Despite significant recent improvements to our understanding of the early evolution of the Order Proboscidea (elephants and their extinct relatives), geographic sampling of the group’s Paleogene fossil record remains strongly biased, with the first ~30 million years of proboscidean evolution documented solely in near-coastal deposits of northern Africa. The considerable morphological disparity that is observable among the late Eocene and early Oligocene proboscideans of northern Africa suggests that other, as yet unsampled, parts of Afro-Arabia might have served as important centers for the early diversification of major proboscidean clades. Here we describe the oldest taxonomically diagnostic remains of a fossil proboscidean from the Arabian Peninsula, a partial mandible of Omanitherium dhofarensis (new genus and species), from near the base of the early Oligocene Shizar Member of the Ashawq Formation, in the Dhofar Governorate of the Sultanate of Oman. The molars and premolars of Omanitherium are morphologically intermediate between those of Arcanotherium and Barytherium from northern Africa, but its specialized lower incisors are unlike those of other known Paleogene proboscideans in being greatly enlarged, high-crowned, conical, and tusk-like. Omanitherium is consistently placed close to late Eocene Barytherium in our phylogenetic analyses, and we place the new genus in the Family Barytheriidae. Some features of Omanitherium, such as tusk-like lower second incisors, the possible loss of the lower central incisors, an enlarged anterior mental foramen, and inferred elongate mandibular symphysis and diminutive P2, suggest a possible phylogenetic link with Deinotheriidae, an extinct family of proboscideans whose origins have long been mysterious.


Read the article »

Project DOI: 10.7934/P697, http://dx.doi.org/10.7934/P697
This project contains
  • 1 Media
  • 1 Document
  • 1 Taxon
  • 1 Specimen
Total size of project's media files: 148.74k

Download Project SDD File
Currently Viewing:
MorphoBank Project 697

    This research
    supported by

    Authors' Institutions

    • Ohio University

    • Sultan Qaboos University

    • Stony Brook University

    • Western University of Health Sciences



    Members

    member name taxa specimens media
    Erik Seiffert
    Project Administrator
    Last logged in 03/27/12
    111


    Project has no matrices defined.



    Project views

    type number of views Individual items viewed (where applicable)
    Total project views12727
    Project overview2891
    Media views4451Media search (3819 views); M106535 (632 views);
    Documents list1386
    Specimen list2228
    Taxon list1728
    Bibliography43




    Project downloads

    type number of downloads Individual items downloaded (where applicable)
    Total downloads from project221
    Project downloads206
    Document downloads15omanitherium.nex (15 downloads);