Project 484: K.-G. Gao, R. C. Fox, C.-F. Zhou, D.-Q. Lo. 2010. A new nonmammalian eucynodont (Synapsida, Therapsida) from the Triassic of northern Gansu Province, China, and its biostratigraphic and biogeographic implications. American Museum Novitates. 3685:1-25.
Specimen: † Beishanodon (PKUP:V3007)
View: dorsal

Abstract

A new trirachodontid eucynodont, Beishanodon youngi, is named and described based on a well-preserved skull from Triassic lacustrine deposits exposed in the Beishan Hills, northern Gansu Province, China. The new discovery documents the second record of trirachodontid eucynodonts known from China, along with Sinognathus gracilis from the Middle Triassic Ermaying Formation exposed in Shanxi Province. Cladistic analysis supports the placement of the new taxon as the sister group of Sinognathus, and the two together can be classified in Sinognathinae, a new subfamily differentiated from other trirachodontids by possession of several derived character states, including extremely short snout and strongly expanded temporal region. In addition, the stratigraphic and biogeographic significance of the new discovery are discussed. Because trirachodontids have a restricted stratigraphic range in the Triassic, as best documented by the Cynognathus Assemblage Zone of South Africa, discovery of the new fossil of this group from northern Gansu Province in China provides definitive evidence for a Triassic age of the fossil-bearing beds exposed in the Beishan Hills; moreover, the fossil beds are assessed as Early Triassic in age based on the evidence from the entire vertebrate fauna.


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Article DOI: http://hdl.handle.net/2246/6069

Project DOI: 10.7934/P484, http://dx.doi.org/10.7934/P484
This project containsMatrices
  • 2 Media
  • 1 Matrix
  • 3 Documents
  • 27 Taxa
  • 1 Specimen
  • 50 Characters
Total size of project's media files: 3 MB

Download Project SDD File
Total scored cells: 786
Total media associated with cells: 0
Total labels associated with cell media: 0
Characters
Total characters: 50
Total characters with associated media: 0
Total characters with media with labels: 0
Total character states: 119
Total character states with associated media: 0
Total character states with media with labels:0
Total unordered/ordered characters:50/0
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MorphoBank Project 484


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    (scored, NPA, "-")
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    MorphoBank Curator
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    Last logged in 05/15/18
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    (786, 0, 0)
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    Maureen Admin
    Full membership
    Last logged in 05/14/18
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    (0, 0, 0)
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    Gao Ke-Qin
    Full membership
    Last logged in Never
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    Taxonomic Overview for Matrix 'M25434' (20 Taxa)

    taxon unscored
    cells
    scored
    cells
    no cell
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    NPA
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    "-" cellscell images labels on
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    [1] † Cynognathus
    Last Modified in 05/14/18
    13373700003
    [2] † Diademodon
    Last Modified in 05/14/18
    3484700003
    [3] † Trirachodon
    Last Modified in 05/14/18
    2514800003
    [4] † Langbergia modisei
    Last Modified in 05/15/18
    2484800003
    [5] † Cricodon metabolus
    Last Modified in 05/15/18
    11403900003
    [6] † Andescynodon
    Last Modified in 05/14/18
    12383800003
    [7] † Massetognathus
    Last Modified in 05/14/18
    0515000003
    [8] † Exaeretodon
    Last Modified in 05/14/18
    1494900003
    [9] † Luangwa drysdalli
    Last Modified in 05/15/18
    8434200003
    [10] † Scalenodon angustifrons
    Last Modified in 05/15/18
    6454400003
    [11] † Mandagomphodon hirschsoni
    Last Modified in 05/15/18
    17333300003
    [12] † Traversodon
    Last Modified in 05/14/18
    14363600003
    [13] † Gomphodontosuchus
    Last Modified in 05/14/18
    18323200003
    [14] † Pascualgnathus
    Last Modified in 05/14/18
    15353500003
    [15] † Scalenodontoides
    Last Modified in 05/14/18
    16343400003
    [16] † Menadon
    Last Modified in 05/14/18
    12383800003
    [17] † Dadadon
    Last Modified in 05/14/18
    23272700003
    [18] † Santacruzodon
    Last Modified in 05/14/18
    15353500003
    [19] † Sinognathus gracilis
    Last Modified in 05/15/18
    18323200003
    [20] † Beishanodon youngi
    Last Modified in 05/15/18
    16343400003


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    Bibliography916
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    Document downloads6Matrix (5 downloads); Character descriptions (1 download);
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