Project 2285: B. Bai,Y.-Q. Wang,F.-Y. Mao,J. Meng. 2017. New Material of Eocene Helaletidae (Perissodactyla, Tapiroidea) from the Irdin Manha Formation of the Erlian Basin, Inner Mongolia, China and Comments on Related Localities of the Huheboerhe Area. American Museum Novitates. 3878:1-44.
Specimen: † Paracolodon fissus (IVPP/V 22640)
View: A, lateral view of cranium and mandible; B−C, dorsal and ventral views of the cranium.

Abstract

Perissodactyls first appeared at the beginning of the early Eocene and reached their highest diversity, dominating contemporaneous mammalian faunas in species richness during the middle Eocene. Tapiroidea is an important perissodactyl group that includes earliest-Eocene forms, such as Orientolophus as well as extant taxa (such as Tapirus), that preserves numerous plesiomorphic characters. Because tapiroids were widely distributed in North America and Asia in the middle Eocene, they have played an important role in biostratigraphically defining middle Eocene North American Land Mammal Ages (NALMA) and Asian Land Mammal Ages (ALMA), respectively, as well as in biostratigraphic correlation between the two continents. Here we report a new cranial specimen of middle Eocene helaletid Paracolodon fissus and a maxilla of Desmatotherium mongoliense from the middle Eocene Irdin Manha Formation of the Erlian Basin, Inner Mongolia, China. Paracolodon fissus was previously assigned to Desmatotherium, Helaletes, or Colodon, whereas D. mongoliense was assigned to Helaletes or Irdinolophus by different authors. Based on the new material described in this report, we are able to clarify the affinities and phylogenetic position of these species according to morphological comparison and phylogenetic analyses. We maintain the genus Paracolodon for P. inceptus and P. fissus from Asia and reassign mongoliense to Desmatotherium. Fossils of perissodactyls and other groups from the Irdin Manha Formation favor correlation of the Irdinmanhan ALMA with the early and middle Uintan NALMA (Ui1-Ui2). Through our field investigation, we also clarified that the localities “7 miles southwest” and “10 miles southwest” of Camp Margetts, originally used by the American Museum of Natural History’s Central Asiatic Expedition (CAE), correspond to the localities currently known as Huheboerhe and Changanboerhe, respectively.


Read the article »

Article DOI: https://doi.org/10.1206/3878.1

Project DOI: 10.7934/P2285, http://dx.doi.org/10.7934/P2285
This project containsMatrices
  • 1 Media
  • 1 Matrix
  • 26 Taxa
  • 1 Specimen
  • 73 Characters
Total size of project's media files: 33 MB

Download Project SDD File
Total scored cells: 1148
Total media associated with cells: 0
Total labels associated with cell media: 0
Characters
Total characters: 73
Total characters with associated media: 0
Total characters with media with labels: 0
Total character states: 187
Total character states with associated media: 0
Total character states with media with labels:0
Total unordered/ordered characters:73/0
Currently Viewing:
MorphoBank Project 2285


    Members

    member name taxa specimens media chars character
    media
    labels
    cell scorings
    (scored, NPA, "-")
    cell
    medialabels
    rules
    Bin Bai
    Project Administrator
    Last logged in 06/08/17
    261173001148
    (1134, 0, 14)
    000


    Taxonomic Overview for Matrix 'M24182' (19 Taxa)

    taxon unscored
    cells
    scored
    cells
    no cell
    support
    NPA
    cells
    "-" cellscell images labels on
    cell images
    member
    access
    [1] † Homogalax protapirinus
    Last Modified in 06/08/17
    0706904001
    [2] † Heptodon calciculus
    Last Modified in 06/08/17
    0727003001
    [3] † Helaletes nanus
    Last Modified in 06/08/17
    0757300001
    [4] † Thuliadanta mayri
    Last Modified in 06/08/17
    13595901001
    [5] † Desmatotherium intermedius
    Last Modified in 06/08/17
    13605901001
    [6] † Desmatotherium mongoliensis
    Last Modified in 06/08/17
    6706700001
    [7] † Desmatotherium fissum
    Last Modified in 06/08/17
    10706300001
    [8] † Paracolodon inceptus
    Last Modified in 06/08/17
    28464500001
    [9] † Colodon kayi
    Last Modified in 06/08/17
    25484800001
    [10] † Colodon woodi
    Last Modified in 06/08/17
    29444400001
    [11] † Plesiocolopirus hancocki
    Last Modified in 06/08/17
    10636300001
    [12] † Hesperaletes
    Last Modified in 06/08/17
    9666400001
    [13] † Colodon occidentalis
    Last Modified in 06/08/17
    0727102001
    [14] † Colodon? cingulatus (primative)
    Last Modified in 06/08/17
    5696800001
    [15] † Colodon stovalli
    Last Modified in 06/08/17
    22515100001
    [16] † Colodon orientalis
    Last Modified in 06/08/17
    52212100001
    [17] † Dilophodon minusculus
    Last Modified in 06/08/17
    20535102001
    [18] † Heteraletes leotanus
    Last Modified in 06/08/17
    18545401001
    [19] † Protapirus
    Last Modified in 06/08/17
    3717000001


    Project views

    type number of views Individual items viewed (where applicable)
    Total project views3414
    Project overview543
    Media views851Media search (713 views); M451587 (138 views);
    Matrix views402Matrix landing page (366 views); Helaletidae phylogeny (36 views);
    Views for media list235
    Taxon list857
    Bibliography144
    Specimen list382




    Project downloads

    type number of downloads Individual items downloaded (where applicable)
    Total downloads from project51
    Project downloads50
    Matrix downloads1Helaletidae phylogeny (1 download);