A reassessment of bunodont metatherians from the paleogene of itaboraí (Brazil): systematics and age of the Itaboraian salma

Early Paleogene metatherians with inflated, low cusps (bunodont dentition), such as <i>Bobbschaefferia, Procaroloameghinia, Protodidelphis, Guggenheimia</i>, and <i>Zeusdelphys</i> have been subject to different interpretations regarding their affinities. A phylogenetic study...

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Autores principales: Oliveira, Édison V., Goin, Francisco Javier
Formato: Articulo
Lenguaje:Inglés
Publicado: 2011
Materias:
Paleontología
Ameridelphia
Australidelphia
Chronostratigraphy
Didelphimorphia
Eocene
Metatheria
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/84173
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-84173
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Paleontología
Ameridelphia
Australidelphia
Chronostratigraphy
Didelphimorphia
Eocene
Metatheria
spellingShingle Paleontología
Ameridelphia
Australidelphia
Chronostratigraphy
Didelphimorphia
Eocene
Metatheria
Oliveira, Édison V.
Goin, Francisco Javier
A reassessment of bunodont metatherians from the paleogene of itaboraí (Brazil): systematics and age of the Itaboraian salma
topic_facet Paleontología
Ameridelphia
Australidelphia
Chronostratigraphy
Didelphimorphia
Eocene
Metatheria
description Early Paleogene metatherians with inflated, low cusps (bunodont dentition), such as <i>Bobbschaefferia, Procaroloameghinia, Protodidelphis, Guggenheimia</i>, and <i>Zeusdelphys</i> have been subject to different interpretations regarding their affinities. A phylogenetic study including these bunodont marsupials and other selected metatherians presented here leads to the recognition of the following taxonomic assignments: "Ameridelphia", Protodidelphidae: <i>Carolocoutoia ferigoloi, Guggenheimia brasiliensis, G. crocheti</i> sp. nov., <i>Protodidelphis vanzolinii, P. mastodontoides (=Robertbutleria mastodontoidea), Periprotodidelphis bergqvisti </i> gen. et sp. nov., and <i>Zeusdelphys complicatus; Marsupialia, Didelphimorphia, Peradectoidea, Caroloameghiniidae: Procaroloameghinia pricei</i>; Australidelphia, Polydolopimorphia, family indet.: <i>Bobbschaefferia fluminensis</i> and aff. <i>Bobbschaefferia</i> sp. The phylogenetic analysis does not support a closer relationship between protodidelphids and living didelphids as well as between <i>Guggenheimia</i> and <i>Mirandatherium</i>. No closer relationship was found between <i>Zeusdelphys</i> with <i>Minusculodelphis</i> and <i>Monodelphopsis</i>. <i>Procaroloameghinia</i> is regarded as a peradectoid didelphimorphian with bunoid dentition convergent with, but without direct affinities to, protodidelphids or polydolopimorphians. <i>Bobbschaefferia</i> is regarded as a basal polydolopimorphian, even though the scarce evidence at hand prevents us from assign it to any particular family of the suborder Hatcheriformes. Correlation with stratigraphic, sedimentary and magmatic data from some of the best studied margin basins in SE Brazil, together with the systematic reassessment of bunodont metatherians from Itaboraí, suggest that the Itaboraian SALMA is latest Paleoceneearly Eocene in age. Itaboraian protodidelphids, sternbergiids and caroloameghiniids are also recorded in the Las Flores locality/ Formation (central Patagonia) and in the La Barda locality (northwestern Patagonia) during the latest Paleocene and early Eocene.
format Articulo
Articulo
author Oliveira, Édison V.
Goin, Francisco Javier
author_facet Oliveira, Édison V.
Goin, Francisco Javier
author_sort Oliveira, Édison V.
title A reassessment of bunodont metatherians from the paleogene of itaboraí (Brazil): systematics and age of the Itaboraian salma
title_short A reassessment of bunodont metatherians from the paleogene of itaboraí (Brazil): systematics and age of the Itaboraian salma
title_full A reassessment of bunodont metatherians from the paleogene of itaboraí (Brazil): systematics and age of the Itaboraian salma
title_fullStr A reassessment of bunodont metatherians from the paleogene of itaboraí (Brazil): systematics and age of the Itaboraian salma
title_full_unstemmed A reassessment of bunodont metatherians from the paleogene of itaboraí (Brazil): systematics and age of the Itaboraian salma
title_sort reassessment of bunodont metatherians from the paleogene of itaboraí (brazil): systematics and age of the itaboraian salma
publishDate 2011
url http://sedici.unlp.edu.ar/handle/10915/84173
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