UN NUEVO CARDIATHERIINAE (RODENTIA, HYDROCHOERIDAE) DE LA FORMACION MONTE HERMOSO CPLIOCENO SUPERIOR) DE LA PROVINCIA DE Bl[ENOS AIRES. ALGUNAS CONSIDERACIONES ?SOBRE LA EVOLUCION MORFOLOGICA? DE LOS MOLARIFORMES DE LOS CARDIATHERIINAE
AbstractThe present paper deals with sonie fragments of two differents specimens wich belong to a new Cardiatheriinae: Neoanchimys Pisanoi gen. et sp. nov. They have been found in the Upper Pliocene ("Hermosense") in silstones from the. Monte Hermosa cliffs, Buenris Aires Province, Argentina. In the first part we analyze and critically synthesize L. Kraglievich's interpretation of the phylogeny and morphological variations of the cheek-tc~eth of these primitive South American "carpinchos''. In order to get a nomenclatorial adjustment suited for the descriptions of the lower cheek-teeth, a system composed by signs of the terms proposed by.Rusconi·for the premolar. and .by Kraglievich for. all the molarifoims, is integrated. After the description, in the second part, the chararacters of this new taxon are analyzed. It is considered as direct descendant of the Eucardiodon-Anchimys group, We consider this new genus as belonging to a distinct line from the one that Kraglievich ended with Cardiatherium. On the basis of the morphology of the molariforms we consider the Eucardiodon-Anchimys group as ancestor of the Hydrochoerinae as Plexochoerus or Cardiatherium could be, following Kraglievich's interpretation. The examination of the material of the Cardiatheriinae from the Argentinian Pliocene suggests that the phylogehetic hiStory of these rodents must have been more complicated and not as ortogenetic as Kraglievich pretended.
How to Cite
Authors publishing in Ameghiniana have the option of making their article freely available online. Authors opting for the Open Access must pay a fee of $300 (US dollars) to cover article-processing costs and to ensure the article is made open access. Please contact the Production Team after the acceptance of your manuscript if you are interested in making your article Open Access. This option implies by default a license Creative Commons Attribution Non-Commercial-NoDerivs License (CC BY NC ND). If your funding institution requires a different licensing option please communicate this to the Production Team after the acceptance of your manusctipt.