IANIGLA   20881
INSTITUTO ARGENTINO DE NIVOLOGIA, GLACIOLOGIA Y CIENCIAS AMBIENTALES
Unidad Ejecutora - UE
artículos
Título:
Description of a new species of Sparassocynus (Marsupialia: Didelphoidea: Sparassocynidae) from the late Miocene of Jujuy (Argentina) and taxonomic review of Sparassocynus heterotopicus from the Pliocene of Bolivia
Autor/es:
ABELLO, M. A.; DE LOS REYES, M.; CANDELA, A.; PUJOS, F.; VOGLINO, D.; MAMANI QUISPE, B.
Revista:
ZOOTAXA
Editorial:
MAGNOLIA PRESS
Referencias:
Lugar: Auckland; Año: 2015 vol. 3937 p. 147 - 147
ISSN:
1175-5326
Resumen:
A new species of sparassocynid marsupial, Sparassocynus maimarai n. sp. from the late Miocene of MaimarĂ¡ Formation (Jujuy Province, Argentina) is described from a left mandibular fragment with a complete p2?m4 series. It differs from the remaining species of the genus S. bahiai (Montehermosan?late Miocene/early Pliocene?of Buenos Aires Province, Argentina) and S. derivatus (Chapadmalalan and Marplatan?Pliocene of Buenos Aires Province) by its smaller size, the relatively longer m1 with respect to the m4, the presence of a lingual cingulum extended between para- and metaconid on the m1?3, and its more robust entoconids. As part of this study the taxonomic status of Sparassocynus heterotopicus (Montehermosan, Umala, Bolivia; Pliocene) was reviewed concluding that this taxon should be referred to as ?Sparassocynus? heterotopicus and considered a Didelphoidea of uncertain affinities. Sparassocynus maimarai n. sp. is the oldest records of the genus, adding new information to evaluate the origins and early diversification of sparassocynids. Sparassocynus maimarai n. sp. was recovered with precise stratigraphic control, highlighting its potential biostratigraphic significance to the temporal correlations between MaimarĂ¡ Formation and other Mio?Pliocene stratigraphic units from the northwestern Argentina
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