Project 84: R. V. Hill, J. A. McCartney, E. Roberts, M. Bouare, F. Sissoko, M. A. O'Leary. 2008. Dyrosaurid (Crocodyliformes: Mesoeucrocodylia) fossils from the Upper Cretaceous and Paleogene of Mali: implications for phylogeny and survivorship across the K/T boundary. American Museum Novitates. 3631:1-19.
Specimen: † Rhabdognathus keiniensis (unvouchered)

Abstract

We describe new dyrosaurid fossils from three localities in Mali, representing strata of
Maastrichtian, Paleocene, and Eocene ages. The fossils significantly extend the temporal and
geographic ranges of several known dyrosaurid taxa. Rhabdognathus keiniensis and Chenanisuchus lateroculi are identified for the first time from Maastrichtian sediments. Additional material is referred to Phosphatosaurus gavialoides and, tentatively, the genus Sokotosuchus. These discoveries represent the first occurrence of Chenanisuchus and possibly of Sokotosuchus from Mali. Previously unknown morphological character states are incorporated into existing data matrices, reducing the amount of missing data. Phylogenetic analyses largely corroborate prior hypotheses of dyrosaurid relationships, but indicate a need for new characters to resolve the relationships of certain genera and species. The occurrence of both basal (e.g., Chenanisuchus lateroculi) and highly nested (e.g., Rhabdognathus keiniensis) members of Dyrosauridae on both sides of the K/T boundary indicates that dyrosaurid diversification was well underway by the latest Cretaceous, and that most, if not all dyrosaurid species survived the extinction event. The geology of the Mali’s Tilemsi Valley is clarified; some rocks previously assigned to the Iullemmeden Basin actually represent extensions of other basins: the Taoudeni Basin and Gao Trench.


Read the article »

Project DOI: 10.7934/P84, http://dx.doi.org/10.7934/P84
This project containsMatrices
  • 14 Media
  • 1 Matrix
  • 2 Documents
  • 19 Taxa
  • 7 Specimens
  • 39 Characters
Total size of project's media files: 189.36M

Download Project SDD File
Total scored cells: 434
Total media associated with cells: 44
Total labels associated with cell media: 0
Characters
Total characters: 39
Total characters with associated media: 0
Total characters with media with labels: 0
Total character states: 85
Total character states with associated media: 0
Total character states with media with labels:0
Total unordered/ordered characters:39/0
Currently Viewing:
MorphoBank Project 84

    This research
    supported by

    Authors' Institutions

    • University of the Witwatersrand

    • American Museum of Natural History

    • New York Institute of Technology

    • Stony Brook University



    Members

    member name taxa specimens media media
    notes
    chars character
    notes  media
    labels
    cell scorings
    (scored, NPA, "-")
    cell
    notes  medialabels
    rules
    Robert Hill
    Project Administrator
    Last logged in 10/16/09
    19380393800434
    (413, 0, 21)
    04400
    Seth Kaufman
    Last logged in 12/11/07
    000000000
    (0, 0, 0)
    0000
    Jacob McCartney
    Full membership
    Last logged in 11/10/07
    046500000
    (0, 0, 0)
    0000
    Maureen O'Leary
    Full membership
    Last logged in 02/12/11
    000000000
    (0, 0, 0)
    0000


    Taxonomic Overview for Matrix 'M711' (14 Taxa)

    taxon unscored
    cells
    scored
    cells
    no cell
    support
    NPA
    cells
    "-" cellscell images labels on
    cell images
    member
    access
    [1] † Eutretauranosuchus
    Last Modified in 12/05/13
    8272704004
    [2] † Elosuchus
    Last Modified in 12/05/13
    7303002004
    [3] † Sarcosuchus
    Last Modified in 12/05/13
    2333304004
    [4] † Terminonaris
    Last Modified in 12/05/13
    3333303004
    [5] † Arambourgisuchus
    Last Modified in 12/05/13
    5333301004
    [6] † Hyposaurus
    Last Modified in 12/05/13
    2373000904
    [7] † Rhabdognathus aslerensis
    Last Modified in 12/05/13
    12265012504
    [8] † Rhabdognathus keiniensis
    Last Modified in 12/05/13
    13262400304
    [9] † Dyrosaurus phosphaticus
    Last Modified in 12/05/13
    3363600004
    [10] † Dyrosaurus maghribensis
    Last Modified in 12/05/13
    0363603004
    [11] † Chenanisuchus lateroculi
    Last Modified in 12/05/13
    8302901104
    [12] † Sokotosuchus
    Last Modified in 12/05/13
    15232001304
    [13] † Phosphatosaurus
    Last Modified in 12/05/13
    14242101304
    [14] † Congosaurus
    Last Modified in 12/05/13
    20191900004


    Project views

    type number of views Individual items viewed (where applicable)
    Total project views32789
    Project overview2535
    Media views11630M27913 (560 views); Media search (3797 views); M27908 (568 views); M27909 (534 views); M27904 (572 views); M27912 (602 views); M27910 (555 views); M10554 (552 views); M10558 (522 views); M10556 (604 views); M10553 (576 views); M10555 (550 views); M27911 (569 views); M27906 (518 views); M10898 (551 views);
    Matrix views1766Matrix landing page (1541 views); Hill et al. (2008) (225 views);
    Specimen list6606
    Documents list1036
    Taxon list8339
    Bibliography877




    Project downloads

    type number of downloads Individual items downloaded (where applicable)
    Total downloads from project294
    Media downloads25M10558 (2 downloads); M10556 (2 downloads); M27913 (5 downloads); M10554 (2 downloads); M27909 (2 downloads); M27908 (4 downloads); M10553 (1 download); M27906 (1 download); M27904 (1 download); M27912 (3 downloads); M27910 (1 download); M27911 (1 download);
    Matrix downloads15Hill et al. (2008) (15 downloads);
    Project downloads254