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capítulos de libros
Título:
The Notohippidae (Mammalia, Notoungulata)from Gran Barranca,Sarmiento Formation, Chubut Province, Argentina.
Autor/es:
G.M. LĂ“PEZ, A.M. RIBEIRO AND M. BOND
Libro:
The Paleontology of Gran Barranca: Evolution and Environmental Change through the Middle Cenozoic
Editorial:
Cambridge University Press
Referencias:
Lugar: Cambridge,UK; Año: 2010; p. 143 - 151
Resumen:
AbstractThe Notohippidae include notoungulates from Casamayoranto the ?Piso Notohippidense? of the early Santacrucian.The oldest forms have brachydont to mesodontdentitions, while later forms attain hypsodonty and sometaxa from the late Oligocene to middle Miocene evolveda thick coating of external cement on their teeth.The greatest diversity of taxa has been found in theDeseadan localities of La Flecha, Cabeza Blanca, andScarritt Pocket in Argentine Patagonia. New material ofNotohippidae has been recovered from several stratigraphiclevels of different ages at Gran Barranca.GBV-3 ?El Rosado? (Rosado Member) from theMustersan SALMA has yielded material referred toPuelia with some doubt. GBV-4 ?La Cancha? (VeraMember) of Tinguirirican SALMA has yielded fragmentaryremains that suggest considerable diversity, includingmaterial referred to Puelia plicata, Puelia sp., Eomorphippusobscurus, Eomorphippus pascuali, and Eomorphippussp. GBV-19 ?La Cantera? (Unit 3, Upper PuestoAlmendra Member) of pre-Deseadan aspect has yieldedtwo new notohippids: Patagonhippus canterensis n. gen.et sp. and Patagonhippus dukei n. gen. et sp. Both speciesare closely related to well-known taxa from La Flechaand Cabeza Blanca, but are more primitive morphologically.Finally in the Lower Fossil Zone of the Colhue-Huapi Member, of Colhuehuapian SALMA age, occursArgyrohippus cf. A. boulei.