Artículo
A new record of a giant neoepiblemid rodent from Peruvian Amazonia and an overview of lower tooth dental homologies among chinchilloids
Boivin, Myriam
; Antoine, Pierre Olivier; Benites Palomino, Aldo; Marivaux, Laurent; Salas Gismondi, Rodolfo
Fecha de publicación:
05/2019
Editorial:
Polish Academy of Sciences. Institute of Paleobiology
Revista:
Acta Palaeontologica Polonica
ISSN:
0567-7920
e-ISSN:
1732-2421
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
We report here a new record of the giant caviomorph Phoberomys corresponding to a fragmentary mandible from the Monte Salvado area, Peruvian Amazonia (Madre de Dios Department). We describe this specimen and compare it with the material previously attributed to Phoberomys. The mandibular fragment is referred to as Phoberomys sp. Found as float on a bank of the Río Las Piedras, it has been hypothetically assigned a late Miocene age, due to the local/regional stratigraphic and lithologic context. This specimen constitutes the second record of Phoberomys in Peru. For the first time, the pattern of p4s and lower molars in Phoberomys was analyzed and compared to a large taxonomic sample (including Paleogene–Recent chinchilloids and other caviomorphs) in order to progress the understanding of the homology of dental structures in this genus. For p4s and lower molars, the position of the protoconid in Phoberomys and other chinchilloids (Drytomomys sp., Potamarchus, Eumegamys, Gyriabrus, Isostylomys, and Tetrastylus) is ambiguous, and as a result we propose two alternative homology hypotheses for these taxa: protoconid within the first and second laminae or within the third lamina on juvenile specimens. The knowledge of a comprehensive ontogenetic sequence in extinct and extant chinchilloids, associated with more complete palaeontological records, would likely allow for a clarification of these homology ambiguities.
Palabras clave:
MAMMALIA
,
MANDIBLE
,
MONTE SALVADO
,
PALAEOGENE
,
PERU
,
PHOBEROMYS
,
RODENTIA
,
SOUTH AMERICA
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Identificadores
Colecciones
Articulos(INECOA)
Articulos de INSTITUTO DE ECORREGIONES ANDINAS
Articulos de INSTITUTO DE ECORREGIONES ANDINAS
Citación
Boivin, Myriam; Antoine, Pierre Olivier; Benites Palomino, Aldo; Marivaux, Laurent; Salas Gismondi, Rodolfo; A new record of a giant neoepiblemid rodent from Peruvian Amazonia and an overview of lower tooth dental homologies among chinchilloids; Polish Academy of Sciences. Institute of Paleobiology; Acta Palaeontologica Polonica; 64; 3; 5-2019; 627-642
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