Project 3245: T. A. Gates, K. Tsogtbaatar, L. E. Zanno, T. Chinzorig, M. Watabe. 2018. A new iguanodontian (Dinosauria: Ornithopoda) from the Early Cretaceous of Mongolia. PeerJ. 6:e5300.
Specimen: † Choyrodon barsboldi (MPC-D:100/801)
View: lateral

Abstract

We describe a new iguanodontian ornithopod, Choyrodon barsboldi gen. et sp. nov. from the Albian-aged Khuren Dukh Formation of Mongolia based on several partial skeletons interpreted to represent a subadult growth stage based on osteohistological features. This new taxon is diagnosed by many autapomorphies of the maxilla, nasal, lacrimal, opisthotic, predentary, and surangular. Choyrodon displays an unusual combination of traits, possessing an open antorbital fenestra (a primitive ornithopod trait) together with derived features such as a downturned dentary and enlarged narial fenestra. Histological imaging suggests that the type specimen of Choyrodon would have been a subadult at the time of death. Phylogenetic analysis of two different character matrices do not posit Choyrodon to be the sister taxon or to be more primitive than the iguanodontian Altirhinus kurzanovi, which is found in the same formation. The only resolved relationship of this new taxon is that it was hypothesized to be a sister-taxon with the North American species Eolambia caroljonesa. Though discovered in the same formation and Choyrodon being smaller-bodied than Altirhinus, it does not appear that the former species is an ontogimorph of the latter. Differences in morphology and results of the phylogenetic analyses support their distinction although more specimens of both species will allow better refinement of their uniqueness.


Read the article »

Article DOI: 10.7717/peerj.5300

Project DOI: 10.7934/P3245, http://dx.doi.org/10.7934/P3245
This project contains
  • 1 Media
  • 2 Documents
  • 1 Taxon
  • 1 Specimen
Total size of project's media files: 102.78k

Download Project SDD File
Currently Viewing:
MorphoBank Project 3245

    This research
    supported by

    Authors' Institutions

    • North Carolina Museum of Natural Sciences, Raleigh

    • Hokkaido University

    • North Carolina State University

    • Waseda University

    • Mongolian Academy of Sciences



    Members

    member name taxa specimens media
    MorphoBank Curator
    Project Administrator
    Last logged in 12/26/19
    111
    Terry Gates
    Full membership
    Last logged in Never
    000


    Project has no matrices defined.



    Project views

    type number of views Individual items viewed (where applicable)
    Total project views2458
    Project overview436
    Documents list235
    Media views824Media search (679 views); M585289 (145 views);
    Views for media list217
    Specimen list331
    Taxon list260
    Bibliography155




    Project downloads

    type number of downloads Individual items downloaded (where applicable)
    Total downloads from project60
    Project downloads58
    Media downloads2M585289 (2 downloads);