Project 2347: Juan Martín Leardi, Diego Pol, Fernando E. Novas, Mario Suárez Riglos. 2015. The postcranial anatomy of Yacarerani boliviensis and the phylogenetic significance of the notosuchian postcranial skeleton. Journal of Vertebrate Paleontology. 35 (6):e995187.
Specimen: † Yacarerani boliviensis (MNK-PAL:5064-D)
View: skeleton


In this contribution, we describe new specimens of Yacarerani boliviensis from the Cajones Formation (Upper Cretaceous) of Bolivia. We focus on the postcranial anatomy of Y. boliviensis, because this anatomical region is completely unknown in other sphagesaurid notosuchians up to the present. At least eight individuals representing almost the entire postcranial skeleton are described. Although the postcranial anatomy of Yacarerani resembles that of other notosuchians in many features, five autapomorphic characters were identified: pedicles of the atlas bearing a lateral bulge; absence of rounded depressions on the dorsal surface of the anterior to middle dorsal vertebrae; coracoid bearing an oblique crest on its lateral surface; lateromedially compressed anterior ungual phalanges; and femur with a shallow depression for the M. puboischiofemoralis internus 1 and M. caudifemoralis longus. Observed variation in the postcranial anatomy of basal mesoeucrocodylians was incorporated as new characters in a phylogenetic analysis, expanding the postcranial information used in current phylogenetic data sets. The phylogenetic analysis depicts Yacarerani forming a clade with Adamantinasuchus, which is positioned at the base of Sphagesauridae. This family is well nested among a clade of 'advanced notosuchians,' and Mariliasuchus is recovered as its sister group. The cladistic analysis recovered new postcranial synapomorphies for Notosuchia and less inclusive clades, although the fact that many taxa lack postcranial remains limits the number of unambiguous postcranial synapomorphies within Notosuchia.

Read the article »

Article DOI: 10.1080/02724634.2014.995187

Project DOI: 10.7934/P2347,
This project contains
  • 1 Media
  • 4 Documents
  • 1 Taxon
  • 1 Specimen
Total size of project's media files: 2.69M

Download Project SDD File
Currently Viewing:
MorphoBank Project 2347

    Authors' Institutions

    • Museo Paleontológico Egidio Feruglio

    • Museo de Historia Natural Noel Kempff Mercado

    • Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)

    • Universidad de Buenos Aires

    • Museo Argentino de Ciencias Naturales Bernardino Rivadavia


    member name taxa specimens media
    MorphoBank Curator
    Project Administrator

    Project has no matrices defined.

    Project views

    type number of views Individual items viewed (where applicable)
    Total project views11055
    Project overview2045
    Media views3353Media search (2914 views); M406934 (439 views);
    Documents list1192
    Taxon list1450
    Specimen list1435
    Views for media list917

    Project downloads

    type number of downloads Individual items downloaded (where applicable)
    Total downloads from project255
    Project downloads253
    Document downloads1Yaca10 Matrix (1 download);
    Media downloads1M406934 (1 download);