A NEW SPECIES OF NEOGLYPTATELUS (MAMMALIA, XENARTHRA, CINGULATA) FROM THE LATE MIOCENE OF URUGUAY PROVIDES NEW INSIGHTS ON THE EVOLUTION OF THE DORSAL ARMOR IN CINGULATES

Authors

  • Juan Carlos Fernicola Sección Paleontología de Vertebrados, Museo Argentino de Ciencias Naturales “Bernardino Rivadavia”. Av. Ángel Gallardo 470 1405DJR, Buenos Aires, Argentina. (CONICET)
  • Andrés Rinderknecht Museo Nacional de Historia Natural, 25 de Mayo 582 C.P. 11000. Montevideo, Uruguay
  • Washington Jones Museo Nacional de Historia Natural, 25 de Mayo 582 C.P. 11000. Montevideo, Uruguay
  • Sergio F. Vizcaíno División Paleontología Vertebrados, Unidades de investigación Anexo Museo, Facultad de Ciencias Naturales y Museo Calle 60 y 122, 1900 La Plata, Argenitna (CONICET)
  • Kleberson Porpino Departamento de Ciências Biológicas, Universidade do Estado do Rio Grande do Norte, Rua Antônio Campos s/n, Mossoró, 59610-090, Rio Grande do Norte, Brazil

Keywords:

Carapace, Movement, Pachyarmatheriidae, Glyptatelinae, Phylogeny.

Abstract

The genus Neoglyptatelus Carlini, Zurita, Scillato-Yané, Sánchez, and Aguilera has been considered a member of Glyptatelinae, a group encompassing the purportedly basal-most glyptodonts. It is up to now represented by two species from Colombia: Neoglyptatelus originalis Carlini et al., from the middle Miocene (a carapace fragment, isolated osteoderms and postcranial bones), and Neoglyptatelus sincelejanus Villarroel and Clavijo, from the middle or late Miocene (a partial carapace and a caudal armor). More scarce material assigned to this genus was recovered from the late Miocene of Uruguay and Brazil. In this article, we describe a new species, Neoglyptatelus uruguayensis, from the late Miocene Camacho Formation, Uruguay, based on an almost complete carapace and several postcranial bones. We conducted a phylogenetic analysis based on 167 morphological characters (23 new ones and 144 from previous analysis) scored for 19 taxa, encompassing some of the best known glyptodontid genera, one pampathere and four armadillos (including the enigmatic genus Pachyarmatherium Downing and White). In the most parsimonious tree that was obtained, Neoglyptatelus forms a clade with Pachyarmatherium (Pachyarmatheriidae), which is the sister group of the glyptodonts + pampatheres clade; consequently, it is not a glyptodont, as previously believed. This result, together with the known stratigraphic and geographic distribution of Neoglyptatelus and Pachyarmatherium, suggests that this new cingulate clade originated in South America and that Pachyarmatherium reached North America during the Plio–Pleistocene. The carapace of Neoglyptatelus and Pachyarmatherium comprises pelvic and scapular shields overlapping each other without separate intervening transverse mobile bands, an arrangement that differentiates both genera from the remaining cingulates.

Published

2018-07-26

How to Cite

Fernicola, J. C., Rinderknecht, A., Jones, W., Vizcaíno, S. F., & Porpino, K. (2018). A NEW SPECIES OF NEOGLYPTATELUS (MAMMALIA, XENARTHRA, CINGULATA) FROM THE LATE MIOCENE OF URUGUAY PROVIDES NEW INSIGHTS ON THE EVOLUTION OF THE DORSAL ARMOR IN CINGULATES. Ameghiniana, 55(3), 233–252. Retrieved from https://ameghiniana.org.ar/index.php/ameghiniana/article/view/3150

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