Systematic review of Neocavia from the Neogene of Argentina: Phylogenetic and evolutionary implications.

MADOZZO-JAÉN, M. C.; PÉREZ, MARÍA ENCARNACIÓN; MONTALVO, C.; TOMASSINI, RODRIGO

ACTA PALAEONTOLOGICA POLONICA

INST PALEOBIOLOGII PAN

Lugar: Varsovia; Año: 2018

0567-7920

Caviidae is one of the groups of rodents with the greatest ecomorphological disparity, and with currently three knownlineages: Caviinae (cuises), Dolichotinae (maras), and Hydrochoerinae (capybaras). Caviinae include small caviidsrepresented by three extant genera (Microcavia, Cavia, and Galea) and three fossils forms (Dolicavia, Palaeocavia, andNeocavia). In Argentina, the fossil record of Caviinae is continuous and abundant since the late Miocene. Neocavia,specifically, is represented by different species recorded in the late Miocene?Pliocene. Here, we describe a new speciesof Neocavia from the late Miocene?early Pliocene of the Cerro Azul Formation (La Pampa Province, Argentina), andprovide a re-description of already known species (Neocavia lozanoi and ?Neocavia depressidens?). Also, we performa more comprehensive review of the genus and include the Neocavia species in a phylogenetic context within Caviinae.We analyze the main patterns of the evolution of the tympanic bullae within Caviidae, and infer about a possible occasionalfossorial habit of Neocavia. The morphological and phylogenetic analyses indicate that Neocavia is more closelyrelated to Dolicavia and Microcavia than to the other Caviinae, and confirm the monophyly of the genus, with at least twoclearly differentiable species. Since this study cannot confirm the systematic position and validity of ?N. depressidens?,we suggest not to use this taxon as a biostratigraphic indicator.