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Article: 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 - Volume 7 Issue 1 - Cover
Publication: Palaeontology
Volume: 7
Part: 4
Publication Date: November 2021
Page(s): 1895 1917
Author(s): Pedro Piñero, Diego H. Verzi, A. Itatí Olivares, Claudia I. Montalvo, Rodrigo L. Tomassini, and Ariel Fernández Villoldo
DOI: 10.1002/spp2.1368
Addition Information

How to Cite

PIñERO, P., VERZI, D.H., OLIVARES, A.I., MONTALVO, C.I., TOMASSINI, R.L., VILLOLDO, A.F. 2021. . Papers in Palaeontology, 7, 4, 1895-1917. DOI: /doi/10.1002/spp2.1368

Author Information

  • Pedro Piñero - CONICET, Sección Mastozoología, Museo de La Plata Facultad de Ciencias Naturales y Museo Universidad Nacional de La Plata 1900 La Plata Argentina
  • Diego H. Verzi - CONICET, Sección Mastozoología, Museo de La Plata Facultad de Ciencias Naturales y Museo Universidad Nacional de La Plata 1900 La Plata Argentina
  • A. Itatí Olivares - CONICET, Sección Mastozoología, Museo de La Plata Facultad de Ciencias Naturales y Museo Universidad Nacional de La Plata 1900 La Plata Argentina
  • Claudia I. Montalvo - Facultad de Ciencias Exactas y Naturales Universidad Nacional de La Pampa 6300 Santa Rosa Argentina
  • Rodrigo L. Tomassini - INGEOSUR, Departamento de Geología Universidad Nacional del Sur-CONICET 8000 Bahía Blanca Argentina
  • Ariel Fernández Villoldo - CONICET, Sección Mastozoología, Museo de La Plata Facultad de Ciencias Naturales y Museo Universidad Nacional de La Plata 1900 La Plata Argentina

Publication History

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    Abstract

    We analyse the taxonomic status and diversity of the late Miocene Octodontoidea (Hystricognathi) Cercomys primitiva and related samples, a taxon previously known only from the holotype specimen. New findings associated with an extensive review of late Miocene and early Pliocene rodents have allowed us to recognize the occurrence of this and other related species in several localities of central and western Argentina, and in south-central Bolivia. We discuss the invalidity of Cercomys and propose the new genus Metacaremys, which includes the type species Metacaremys primitiva comb. nov. and two new species, Metacaremys calfucalel sp. nov. and Metacaremys dimi sp. nov. Osteological, brain and dental morphology show that the new genus is not related to Brazilian Echimyidae, as previously considered, but to the southern family Octodontidae. Although the molar morphology of this genus is quite conservative, comparison of the samples shows a variation in size. We discuss the plausible evolutionary pattern explaining this variation and the implied biochronological and biostratigraphical information. It is recognized as an anagenetic lineage in which an increase in size occurs from the oldest species, M. primitiva comb. nov. (early late Miocene, c. 9.23 Ma), to the youngest species, M. dimi sp. nov. (Miocene–Pliocene boundary, c. 5.28 Ma). Metacaremys calfucalel is intermediate in size and age between these two species. The polarity of this pattern of change is consistent with that shown by other partially synchronous independent lineages of octodontoids, thus providing new evidence for the biochronological and biostratigraphic scheme of the late Miocene and early Pliocene of southern South America.

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