Universidad Peruana Cayetano Heredia

Late middle Miocene Metatheria (Mammalia: Didelphimorphia and Paucituberculata) from Juan Guerra, San Martín Department, Peruvian Amazonia

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dc.contributor.author Stutz, N.S.
dc.contributor.author Abello, M.A.
dc.contributor.author Marivaux, L.
dc.contributor.author Boivin, M.
dc.contributor.author Pujos, F.
dc.contributor.author Benites-Palomino, A.M.
dc.contributor.author Salas-Gismondi, Rodolfo
dc.contributor.author Tejada-Lara, J.V.
dc.contributor.author Custódio, M.A.
dc.contributor.author Roddaz, M.
dc.contributor.author Santos, R.V.
dc.contributor.author Ribeiro, A.M.
dc.contributor.author Antoine, P.-O.
dc.date.accessioned 2022-09-09T18:52:23Z
dc.date.available 2022-09-09T18:52:23Z
dc.date.issued 2022
dc.identifier.uri https://hdl.handle.net/20.500.12866/12160
dc.description.abstract Currently, marsupials (modern members of the Metatheria clade) are widely distributed in tropical and subtropical areas of South America, but poorly represented in the fossil record of these regions. Except for the species-rich fossiliferous localities of La Venta in Colombia, additional Miocene metatherians from tropical, equatorial South America are sparsely reported in Bolivia, Brazil, Peru, and Venezuela. Here, we introduce new metatherian remains recovered from the late middle Miocene locality of TAR-31, San Martín Department, Peru, which has been assigned to the Laventan South American Land Mammal Age (∼13 Ma) by mammalian biostratigraphy. Three metatherian taxa are recognized at TAR-31: the didelphid didelphimorph ‘Thylamys’ cf. ‘T.’ colombianus, and the paucituberculatans aff. Palaeothentes and Pitheculites ipururensis sp. nov. This assemblage and the presence of a cebid primate at TAR-31 suggests predominantly humid and warm tropical conditions, with the occurrence of both forests and drier habitats in the surroundings. Comparisons with other Miocene metatherian assemblages at low and mid latitudes of South America clearly confirm close relationships between TAR-31 and La Venta (agreeing with observations based on monkeys and rodents), as well as, to a lesser extent, with Acre River local faunas and Madre de Dios (MD-67) in Brazil and Peru, respectively. The current results support the hypothesis that Western Amazonia was a single and consistent biogeographical region for land mammals over middle Miocene times, at the western edge of the Pebas Mega-Wetland System, and highlight the role of the Amazonian region concerning marsupial Neogene radiation. U–Pb analysis made on detrital zircon grains from TAR-31 gave a maximum depositional age of 17.4 ± 0.12 Ma (i.e., 4 Ma older than the biostratigraphical age), with a mixed detrital source likely comprising Precambrian (Western Amazon Craton), Neoproterozoic (Neoproterozoic mobile belts), and Phanerozoic rocks (Andes). en_US
dc.language.iso eng
dc.publisher Elsevier
dc.relation.ispartofseries Journal of South American Earth Sciences
dc.rights info:eu-repo/semantics/restrictedAccess
dc.rights.uri https://creativecommons.org/licenses/by-nc-nd/4.0/deed.es
dc.subject Laventan en_US
dc.subject Paleobiogeography en_US
dc.subject Didelphimorphia en_US
dc.subject Paucituberculata en_US
dc.subject Pebas Mega-Wetland system en_US
dc.title Late middle Miocene Metatheria (Mammalia: Didelphimorphia and Paucituberculata) from Juan Guerra, San Martín Department, Peruvian Amazonia en_US
dc.type info:eu-repo/semantics/article
dc.identifier.doi https://doi.org/10.1016/j.jsames.2022.103902
dc.relation.issn 1873-0647


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