Project 3260: J. R. Wible, S. L. Shelley, S. Bi. 2019. New Genus and Species of Djadochtatheriid Multituberculate (Allotheria, Mammalia) from the Upper Cretaceous Bayan Mandahu Formation of Inner Mongolia. Annals of Carnegie Museum. 85 (4):285.
Specimen: † Guibaatar (CEVB:11908)
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Abstract

The superfamily Djadochtatherioidea is a distinctive clade of multituberculates from Upper Cretaceous beds of Mongolia and Inner Mongolia, China. Because many of the 11 included genera are known from skulls, more is known about the cranial anatomy of djadochtatherioids than any other clade of multituberculates. Within Djadochtatherioidea, the most diverse and widely accepted group is the family Djadochtatheriidae. Within the family, the basal genus, Kryptobaatar Kielan-Jaworowska, 1970, is small with a skull length of about 30 mm, whereas the other four genera, Djadochtatherium Simpson, 1925, Catopsbaatar Kielan-Jaworowska, 1994, Tombaatar Rougier et al., 1997, and Mangasbaatar Rougier et al., 2016, have skulls approximately twice as long. Here, we describe a new genus and species, Guibaatar castellanus, based on a single specimen from the Upper Cretaceous Bayan Mandahu Formation, Inner Mongolia that we refer to Djadochtatheriidae. Guibaatar is represented by a relatively complete rostrum, a partial right braincase, and partial lower jaws. As revealed by CT scanning, the specimen is a juvenile, with deciduous enlarged upper and lower incisors with permanent replacements forming, m2 erupting, and M2 forming. Based on the preserved cranial parts, we estimate the skull length to be approximately 50 mm, but as an adult, Guibaatar would have been in the size range of the larger djadochtatheriids.

Phylogenetic analysis including Guibaatar, known djadochtatherioids, and outgroups places Guibaatar within Djadochtatheriidae, as sister to a clade of Mangasbaatar and Catopsbaatar. We suspect the relationships of djadochtatherioids are likely to be refined given the announcements by other researchers that skulls are known for the djadochtatheriids Tombaatar and Djadochtatherium, which were previously represented by incomplete material.



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Article DOI: 10.2992/007.085.0401

Project DOI: 10.7934/P3260, http://dx.doi.org/10.7934/P3260
This project containsMatrices
  • 1 Media
  • 1 Matrix
  • 18 Taxa
  • 1 Specimen
  • 74 Characters
Total size of project's media files: 1.79M

Download Project SDD File
Total scored cells: 1373
Total media associated with cells: 0
Total labels associated with cell media: 0
Characters
Total characters: 74
Total characters with associated media: 0
Total characters with media with labels: 0
Total character states: 198
Total character states with associated media: 0
Total character states with media with labels:0
Total unordered/ordered characters:72/2
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MorphoBank Project 3260

    This research
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    Authors' Institutions

    • Yunnan University

    • Carnegie Museum of Natural History

    • Indiana University of Pennsylvania



    Members

    member name taxa specimens media chars character
    media
    labels
    cell scorings
    (scored, NPA, "-")
    cell
    medialabels
    rules
    John Wible
    Project Administrator
    Last logged in 01/16/20
    181174001373
    (970, 358, 45)
    000
    Shundong Bi
    Full membership
    Last logged in Never
    0000000
    (0, 0, 0)
    000
    Sarah Shelley
    Full membership
    Last logged in 06/26/19
    0000000
    (0, 0, 0)
    000


    Taxonomic Overview for Matrix 'M25603' (18 Taxa)

    taxon unscored
    cells
    scored
    cells
    no cell
    support
    NPA
    cells
    "-" cellscell images labels on
    cell images
    member
    access
    [1] † Ptilodus
    Last Modified in 01/16/20
    0717121003
    [2] † Stygimys
    Last Modified in 01/16/20
    04946280003
    [3] † Taeniolabis
    Last Modified in 01/16/20
    05351914003
    [4] † Eucosmodon
    Last Modified in 01/16/20
    02525472003
    [5] † Lambdopsalis
    Last Modified in 01/16/20
    06457214003
    [6] † Sloanbaatar
    Last Modified in 01/16/20
    06057131003
    [7] † Buginbaatar
    Last Modified in 01/16/20
    02625480003
    [8] † Nessovbaatar
    Last Modified in 01/16/20
    01414600003
    [9] † Bulganbaatar
    Last Modified in 01/16/20
    03333401003
    [10] † Kamptobaatar
    Last Modified in 01/16/20
    0696661003
    [11] † Nemegtbaatar
    Last Modified in 01/16/20
    0777030003
    [12] † Chulsanbaatar
    Last Modified in 01/16/20
    0757031003
    [13] † Kryptobaatar
    Last Modified in 01/16/20
    0777201003
    [14] † Djadochtatherium
    Last Modified in 01/16/20
    03636380003
    [15] † Catopsbaatar
    Last Modified in 01/16/20
    0755973003
    [16] † Tombaatar
    Last Modified in 01/16/20
    03837342003
    [17] † Mangasbaatar
    Last Modified in 01/16/20
    0686242003
    [18] † Guibaatar
    Last Modified in 01/16/20
    06053142003


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    Total project views1578
    Project overview194
    Matrix views156Matrix landing page (135 views); File output by Morphobank v3.0 (http://www.morphobank.org); 2018-09-10 13.46.32 (21 views);
    Media views308Media search (267 views); M683413 (41 views);
    Specimen list140
    Taxon list548
    Views for media list85
    Bibliography146
    Documents list1




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