Project 702: D. Pol, J. M. Leardi, A. Lecuona, M. Krause. 2012. Postcranial anatomy of Sebecus icaeorhinus (Crocodyliformes, Sebecidae) from the Eocene of Patagonia. Journal of Vertebrate Paleontology. 32 (2):328-354.
Specimen: Sebecus icaeorhinus (MPEF/PV:1776)

Abstract

We describe postcranial remains of new specimens referred to Sebecus icaeorhinus found in the lower section of the Sarmiento Formation at Cañadón Hondo (central Patagonia, Argentina), commonly regarded as part of the Casamayoran South American Land Mammal Age (middle Eocene). The new specimens include a partially articulated postcranium associated with teeth and fragmentary remains of the mandible that allows their identification as S. icaeorhinus. This taxon was almost exclusively known from skull remains from the same stratigraphic unit and was characterized by unique cranial features such as a long, high, and narrow rostrum bearing serrated teeth. The new material reveals numerous details on the postcranial anatomy of this crocodyliform, including the presence of proportionately long limbs and 10 autapomorphies in the vertebrae, forelimb, and pelvic girdle (some of which are interpreted as adaptations to terrestriality and an erect limb posture). These features depict a highly modified postcranial anatomy for S. icaeorhinus in comparison with that of neosuchian crocodyliforms, paralleling the uniqueness of its skull anatomy. The new information is also phylogenetically informative and incorporated into a cladistic analysis that corroborates not only the close affinities of Sebecidae with Baurusuchidae (sebecosuchian monophyly), but also the deeply nested position of this clade within Notosuchia. The incorporation of postcranial characters to the phylogenetic analysis also results in a novel arrangement of the basal mesoeucrocodylians recorded in the Cretaceous–Cenozoic of Gondwana, clustering all of these species into a large monophyletic clade.


Read the article »

Project DOI: 10.7934/P702, http://dx.doi.org/10.7934/P702
This project contains
  • 1 Media
  • 3 Documents
  • 1 Taxon
  • 1 Specimen
Total size of project's media files: 4 MB

Download Project SDD File
Currently Viewing:
MorphoBank Project 702


    Members

    member name taxa specimens media
    MorphoBank Curator
    Project Administrator
    Last logged in 04/04/12
    111
    Maureen Admin
    Full membership
    Last logged in 04/04/12
    000
    Diego Pol
    Full membership
    Last logged in 04/03/12
    000


    Project has no matrices defined.



    Project views

    type number of views Individual items viewed (where applicable)
    Total project views11946
    Media views4049Media search (3394 views); M106695 (655 views);
    Project overview2702
    Specimen list1868
    Taxon list1331
    Documents list1313
    Bibliography683




    Project downloads

    type number of downloads Individual items downloaded (where applicable)
    Total downloads from project247
    Media downloads9M106695 (9 downloads);
    Project downloads231
    Document downloads7Matrix (5 downloads); Character list (2 downloads);