Project 2749: C. Ji, D. Jiang, R. Motani, O. Rieppel, W. Hao, Z. Sun. 2016. Phylogeny of the Ichthyopterygia incorporating recent discoveries from South China. Journal of Vertebrate Paleontology. 36 (1):e1025956.
Specimen: † Utatsusaurus hataii (usnm/paleobiology:pal559349)
View: dentition


During the last decade, abundant ichthyopterygian material has been found from the Triassic of South China as well as the Upper Jurassic and Lower Cretaceous of Europe and South America, significantly expanding our knowledge of ichthyopterygian diversity through the Mesozoic. Previous phylogenetic hypotheses of the group no longer account for these extensive additions, necessitating a new phylogenetic framework for the entire Ichthyopterygia to enable evolutionary studies of the group. We present here a comprehensive phylogenetic hypothesis for Ichthyopterygia based on cladistic analysis of 163 characters coded for 59 ingroup and five outgroup taxa. The monophyly of Ichthyopterygia is strongly supported by a Bremer index value of 7. Five major groups of Ichthyopterygia during the Triassic, viz., Grippioidea, Cymbospondylidae, Mixosauridae, Shastasauridae, and Toretocnemidae, are well supported by Bremer index values between 3 and 5. Major clades that evolved in the Triassic, including Merriamosauria, Euichthyosauria, and Parvipelvia, are also robustly supported, whereas most post-Triassic clades are very weakly supported with a Bremer index value of 1, with a few exceptions, such as Thunnosauria and Ophthalmosauridae. The traditional Shastasauridae is expanded to comprise six genera but excludes Callawayia, which is more closely related to Parvipelvia than to Shastasauridae. ‘C.’ wolonggangensis is a shastasaurid but does not form a monophyletic clade with Callawayia neoscapularis or Guizhouichthyosaurus tangae as previously asserted. The new phylogenetic hypothesis is generally consistent with the stratigraphic occurrences of each taxon especially for the Triassic taxa.

Read the article »

Article DOI: 10.1080/02724634.2015.1025956

Project DOI: 10.7934/P2749,
This project contains
  • 1 Media
  • 2 Documents
  • 4 Taxa
  • 1 Specimen
Total size of project's media files: 742.96k

Download Project SDD File
Currently Viewing:
MorphoBank Project 2749

    Authors' Institutions

    • Beijing University (Peking University)

    • Chinese Academy of Sciences

    • University of California Davis

    • Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences

    • Field Museum of Natural History


    member name taxa specimens media
    Cheng Ji
    Project Administrator
    Last logged in Never

    Project has no matrices defined.

    Project views

    type number of views Individual items viewed (where applicable)
    Total project views4575
    Media views1095Media search (817 views); M462114 (278 views);
    Project overview1165
    Documents list303
    Taxon list1046
    Specimen list444
    Views for media list325

    Project downloads

    type number of downloads Individual items downloaded (where applicable)
    Total downloads from project58
    Media downloads1M462114 (1 download);
    Project downloads57