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

Juan Carlos Fernicola, Andrés Rinderknecht, Washington Jones, Sergio F. Vizcaíno, Kleberson Porpino

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.

Keywords


Carapace; Movement; Pachyarmatheriidae; Glyptatelinae; Phylogeny.

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