Metacaremys primitiva Piñero et al. 2021 (caviomorph)

Mammalia - Rodentia - Octodontidae

Emended diagnosis. The smallest species of Metacaremys.m12 with occasional presence of mesolophid spur. Mesoflexid more persistent than metaflexid, especially in the m1. Bottom of the metaflexid/fossettid of the m2 curved.

Synonyms: Cercomys primitiva Pascual 1967 [objective synonym], Chasicomys cangapoli Quintana 1995 [objective synonym]

Full reference: P. Piñero, D. H. Verzi, A. I. Olivares, C. I. Montalvo, R. L. Tomassini and A. Fernández Villoldo. 2021. Evolutionary pattern of Metacaremys gen. nov. (Rodentia, Octodontidae) and its biochronological implications for the late Miocene and early Pliocene of southern South America. Papers in Palaeontology 7(4):1859-1917

Belongs to Metacaremys according to P. Piñero et al. 2021

See also Montalvo et al. 2019 and Quintana 1995

Sister taxa: Metacaremys calfucalel, Metacaremys dimi

Type specimens:

  • Metacaremys primitiva: MMP 317-M, a mandible (left mandibular fragment with m1–2 and dp4 alveolus). Its type locality is Barrancas del Arroyo Chasicó, which is in a Chasicoan terrestrial horizon in the Arroyo Chasicó Formation of Argentina.
  • Cercomys primitiva: MMP M317, a mandible (Trozo de cuerpo mandibular iZ'quierdo con parte del incisivo, alvéolo del 'dm4 y ml-m2 implantados.). Its type locality is Barrancas del Arroyo Chasicó, which is in a Chasicoan terrestrial horizon in the Arroyo Chasicó Formation of Argentina.
  • Chasicomys cangapoli: MMP 1501-M, a maxilla (maxilar derecho con DP4-M3). Its type locality is Barrancas del Arroyo Chasicó, which is in a Chasicoan terrestrial horizon in the Arroyo Chasicó Formation of Argentina.

Ecology: ground dwelling herbivore

Distribution:

• Miocene of Argentina (8 collections), Bolivia (1)

Total: 9 collections including 11 occurrences

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Specimen images are retrieved through the ePANDDA API.


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