Project 473: E. Cerdeño, B. Vera. 2010. Mendozahippus fierensis, gen. et sp. nov., New Notohippidae (Notoungulata) from the Late Oligocene of Mendoza (Argentina). Journal of Vertebrate Paleontology. 30 (6):1805-1817.
Specimen: † Mendozahippus fierensis (MCNAM-PV:4004)
View: ventral skull


Since 2006, new field studies at the late Oligocene site of Quebrada Fiera (Mendoza, Argentina) have increased the previous faunal record from these levels that are presently considered as the base of the Agua de la Piedra Formation. Former faunal lists included Pyrotherium and Proborhyaena gigantea, representatives of the Deseadan Age. Among new materials, a complete skull and two associated metatarsals, two maxillary fragments with left I1-M2 and right I1-P3, and five isolated upper teeth represent the Family Notohippidae. Even though some characters are not comparable between the skull and maxillaries, shared features lead us to consider them as a unique and new taxon, Mendozahippus fierensis, gen. et sp. nov., and the isolated molars as cf. M. fierensis. As in previous phylogenies, our analysis indicates the Family Notohippidae is a paraphyletic group. The inclusion of Plexotemnus, Pampahippus, and Puelia within Notohippidae is not supported, but without them, the group is still paraphyletic. Leontiniids appear as basal taxa to the remaining notohippids and toxodontids. Mendozahippus presents one autapomorphy (lingually projected protocone of M3) and four homoplastic characters. It occupies a basal position with respect to other notohippids plus toxodontids. Mendozahippus increases the diversity and geographic distribution of Notohippidae during the late Oligocene. This and other taxa add some distinctiveness to this Deseadan fauna compared to other better-known assemblages from Patagonia or Salla (Bolivia), whereas other groups maintain clear affinities. The intermediate latitudinal position of Mendoza might explain these faunal characteristics.

Read the article »

Project DOI: 10.7934/P473,
This project contains
  • 3 Media
  • 2 Documents
  • 1 Taxon
  • 1 Specimen
Total size of project's media files: 1.3M

Download Project SDD File
Currently Viewing:
MorphoBank Project 473
  • Creation Date:
    03 March 2011
  • Publication Date:
    16 April 2011
  • Project views: 16171

    Authors' Institutions

    • Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)


    member name taxa specimens media
    MorphoBank Curator
    Project Administrator
    Last logged in 05/13/12
    Maureen Admin
    Full membership
    Last logged in 04/15/11
    Esperanza Cerdeño
    Full membership
    Last logged in 03/09/11

    Project has no matrices defined.

    Project views

    type number of views Individual items viewed (where applicable)
    Total project views16171
    Project overview2562
    Media views5149Media search (3348 views); M67505 (682 views); M67504 (565 views); M67506 (554 views);
    Documents list1054
    Specimen list2248
    Views for media list2328
    Taxon list2049

    Project downloads

    type number of downloads Individual items downloaded (where applicable)
    Total downloads from project273
    Document downloads1Appendix 1 (1 download);
    Project downloads272