Dental shape variation of Neogene Pachyrukhinae (Mammalia, Notoungulata, Hegetotheriidae): systematics and evolutionary implications for the late Miocene Paedotherium species
| Autor: | Luciano Luis Rasia, Mariano Andres Ramirez, Marcos D. Ercoli, Adriana Magdalena Candela |
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| Rok vydání: | 2017 |
| Předmět: |
PAEDOTHERIUM BORRELLOI
0106 biological sciences Systematics 010506 paleontology SYSTEMATICS Late Miocene Neogene 010603 evolutionary biology 01 natural sciences NOTOUNGULATA Ciencias de la Tierra y relacionadas con el Medio Ambiente TEETH SHAPE Paleontology stomatognathic system Cheek teeth Notoungulata Hegetotheriidae GEOMETRIC MORPHOMETRIC ANALYSES 0105 earth and related environmental sciences Dentition biology biology.organism_classification stomatognathic diseases Hypsodont PACHYRUKHINAE Meteorología y Ciencias Atmosféricas CIENCIAS NATURALES Y EXACTAS |
| Zdroj: | Journal of Systematic Palaeontology. 16:1073-1095 |
| ISSN: | 1478-0941 1477-2019 |
| Popis: | Paedotherium was the last representative of the pachyrukhines (Notoungulata, Hegetotheriidae), a small rabbit- or caviomorph rodent-like clade, with hypsodont and simplified dentition. In contrast to the Pliocene Paedotherium species, the Miocene species are less known and mainly represented by teeth. Different systematic studies of Paedotherium based on the same set of subtle trait variations of the cheek teeth have arrived at different proposals. With the aim of testing the validity and analysing the morphological variation of Paedotherium species, and assessing the definition and diagnostic value of teeth traits, we performed a dual approach: a traditional qualitative study and exploratory geometric morphometric analyses of the upper and lower cheek teeth (both, partial and complete series). In addition, the configurations of cheek tooth shape were used as landmark characters, in combination with traditional characters, to perform a phylogenetic analysis. We propose the validity of the late Miocene P. borrelloi Zetti, and the assignment of north-western Argentinian representatives of Paedotherium to P. aff. minor. Paedotherium borrelloi is morphologically more similar and phylogenetically more closely related to the Pliocene P. bonaerense than to other Paedotherium species. Our results suggest that during the late Miocene the coexistence of two Paedotherium lineages was already established, whose main morphological differences persisted or even intensified in Pliocene representatives, supporting a more complex evolutionary scenario than previously believed. Fil: Ercoli, Marcos Darío. Universidad Nacional de Jujuy. Instituto de Ecorregiones Andinas. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Salta. Instituto de Ecorregiones Andinas; Argentina Fil: Candela, Adriana Magdalena. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. División Paleontología Vertebrados; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina Fil: Rasia, Luciano Luis. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. División Paleontología Vertebrados; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina Fil: Ramirez, Mariano Andres. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales “Bernardino Rivadavia”; Argentina |
| Databáze: | OpenAIRE |
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