Late middle Miocene caviomorph rodents from Tarapoto, Peruvian Amazonia

Miocene deposits of South America have yielded several species-rich assemblages of caviomorph rodents. They are mostly situated at high and mid- latitudes of the continent, except for the exceptional Honda Group of La Venta, Colombia, the faunal composition of which allowed to describe the late midd...

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Autores principales:	Myriam Boivin, Laurent Marivaux, Walter Aguirre-Diaz, Aldo Benites-Palomino, Guillaume Billet, François Pujos, Rodolfo Salas-Gismondi, Narla S. Stutz, Julia V. Tejada-Lara, Rafael M. Varas-Malca, Anne H. Walton, Pierre-Olivier Antoine
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/42d23a31ef8a43ec972826beee0aec38
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spelling	oai:doaj.org-article:42d23a31ef8a43ec972826beee0aec382021-11-11T06:44:15ZLate middle Miocene caviomorph rodents from Tarapoto, Peruvian Amazonia1932-6203https://doaj.org/article/42d23a31ef8a43ec972826beee0aec382021-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/PMC8565788/?tool=EBIhttps://doaj.org/toc/1932-6203Miocene deposits of South America have yielded several species-rich assemblages of caviomorph rodents. They are mostly situated at high and mid- latitudes of the continent, except for the exceptional Honda Group of La Venta, Colombia, the faunal composition of which allowed to describe the late middle Miocene Laventan South American Land Mammal Age (SALMA). In this paper, we describe a new caviomorph assemblage from TAR-31 locality, recently discovered near Tarapoto in Peruvian Amazonia (San Martín Department). Based on mammalian biostratigraphy, this single-phased locality is unambiguously considered to fall within the Laventan SALMA. TAR-31 yielded rodent species found in La Venta, such as the octodontoid Ricardomys longidens Walton, 1990 (nom. nud.), the chinchilloids Microscleromys paradoxalis Walton, 1990 (nom. nud.) and M. cribriphilus Walton, 1990 (nom. nud.), or closely-related taxa. Given these strong taxonomic affinities, we further seize the opportunity to review the rodent dental material from La Venta described in the Ph.D. volume of Walton in 1990 but referred to as nomina nuda. Here we validate the recognition of these former taxa and provide their formal description. TAR-31 documents nine distinct rodent species documenting the four extant superfamilies of Caviomorpha, including a new erethizontoid: Nuyuyomys chinqaska gen. et sp. nov. These fossils document the most diverse caviomorph fauna for the middle Miocene interval of Peruvian Amazonia to date. This rodent discovery from Peru extends the geographical ranges of Ricardomys longidens, Microscleromys paradoxalis, and M. cribriphilus, 1,100 km to the south. Only one postcranial element of rodent was unearthed in TAR-31 (astragalus). This tiny tarsal bone most likely documents one of the two species of Microscleromys and its morphology indicates terrestrial generalist adaptations for this minute chinchilloid.Myriam BoivinLaurent MarivauxWalter Aguirre-DiazAldo Benites-PalominoGuillaume BilletFrançois PujosRodolfo Salas-GismondiNarla S. StutzJulia V. Tejada-LaraRafael M. Varas-MalcaAnne H. WaltonPierre-Olivier AntoinePublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 16, Iss 11 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Myriam Boivin Laurent Marivaux Walter Aguirre-Diaz Aldo Benites-Palomino Guillaume Billet François Pujos Rodolfo Salas-Gismondi Narla S. Stutz Julia V. Tejada-Lara Rafael M. Varas-Malca Anne H. Walton Pierre-Olivier Antoine Late middle Miocene caviomorph rodents from Tarapoto, Peruvian Amazonia
description	Miocene deposits of South America have yielded several species-rich assemblages of caviomorph rodents. They are mostly situated at high and mid- latitudes of the continent, except for the exceptional Honda Group of La Venta, Colombia, the faunal composition of which allowed to describe the late middle Miocene Laventan South American Land Mammal Age (SALMA). In this paper, we describe a new caviomorph assemblage from TAR-31 locality, recently discovered near Tarapoto in Peruvian Amazonia (San Martín Department). Based on mammalian biostratigraphy, this single-phased locality is unambiguously considered to fall within the Laventan SALMA. TAR-31 yielded rodent species found in La Venta, such as the octodontoid Ricardomys longidens Walton, 1990 (nom. nud.), the chinchilloids Microscleromys paradoxalis Walton, 1990 (nom. nud.) and M. cribriphilus Walton, 1990 (nom. nud.), or closely-related taxa. Given these strong taxonomic affinities, we further seize the opportunity to review the rodent dental material from La Venta described in the Ph.D. volume of Walton in 1990 but referred to as nomina nuda. Here we validate the recognition of these former taxa and provide their formal description. TAR-31 documents nine distinct rodent species documenting the four extant superfamilies of Caviomorpha, including a new erethizontoid: Nuyuyomys chinqaska gen. et sp. nov. These fossils document the most diverse caviomorph fauna for the middle Miocene interval of Peruvian Amazonia to date. This rodent discovery from Peru extends the geographical ranges of Ricardomys longidens, Microscleromys paradoxalis, and M. cribriphilus, 1,100 km to the south. Only one postcranial element of rodent was unearthed in TAR-31 (astragalus). This tiny tarsal bone most likely documents one of the two species of Microscleromys and its morphology indicates terrestrial generalist adaptations for this minute chinchilloid.
format	article
author	Myriam Boivin Laurent Marivaux Walter Aguirre-Diaz Aldo Benites-Palomino Guillaume Billet François Pujos Rodolfo Salas-Gismondi Narla S. Stutz Julia V. Tejada-Lara Rafael M. Varas-Malca Anne H. Walton Pierre-Olivier Antoine
author_facet	Myriam Boivin Laurent Marivaux Walter Aguirre-Diaz Aldo Benites-Palomino Guillaume Billet François Pujos Rodolfo Salas-Gismondi Narla S. Stutz Julia V. Tejada-Lara Rafael M. Varas-Malca Anne H. Walton Pierre-Olivier Antoine
author_sort	Myriam Boivin
title	Late middle Miocene caviomorph rodents from Tarapoto, Peruvian Amazonia
title_short	Late middle Miocene caviomorph rodents from Tarapoto, Peruvian Amazonia
title_full	Late middle Miocene caviomorph rodents from Tarapoto, Peruvian Amazonia
title_fullStr	Late middle Miocene caviomorph rodents from Tarapoto, Peruvian Amazonia
title_full_unstemmed	Late middle Miocene caviomorph rodents from Tarapoto, Peruvian Amazonia
title_sort	late middle miocene caviomorph rodents from tarapoto, peruvian amazonia
publisher	Public Library of Science (PLoS)
publishDate	2021
url	https://doaj.org/article/42d23a31ef8a43ec972826beee0aec38
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Late middle Miocene caviomorph rodents from Tarapoto, Peruvian Amazonia

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