Hilarcotherium castanedaii, gen. et sp. nov., a new Miocene astrapothere (Mammalia, Astrapotheriidae) from the Upper Magdalena Valley, Colombia

M C Vallejo-Pareja,J D Carrillo,J W Moreno-Bernal,M Pardo-Jaramillo,D F Rodriguez-Gonzalez,J Muñoz-Duran

doi:10.1080/02724634.2014.903960

M C Vallejo-Pareja, J D Carrillo + Show 4 more

Open Access

https://doi.org/10.1080/02724634.2014.903960

Copy DOI

Abstract

ABSTRACTAstrapotheria is an order of extinct South American herbivores recorded throughout the continent, from the late Paleocene to middle Miocene. Here we describe Hilarcotherium castanedaii, gen. et sp. nov., an Uruguaytheriinae astrapothere from sediments of La Victoria Formation (middle Miocene) in the Tolima Department, Upper Magdalena Valley, Colombia. H. castanedaii, represented by a partial skull, mandible, and some postcranial remains, is characterized by (1) unique dental formula, with 0/3i, 1/1c, 1/1p, and 3/3 m; and (2) lower canines with subtriangular transverse section at the base. Hilarcotherium differs from the equatorial Uruguaytheriinae genera Xenastrapotherium and Granastrapotherium in (1) having three lower incisors; (2) the diagonal implantation of the lower canines; (3) lower molars with lingual cingulid; (4) the presence of the hypocone in the third upper molar; and (5) the presence of an anterolingual pocket in the fourth upper premolar. Our phylogenetic analysis supports the monophyly of the subfamilies Astrapotheriinae and Uruguaytheriinae. Within the latter, we confirm the monophyly of the neotropical clade (Hilarcotherium, Xenastrapotherium, and Granastrapotherium). H. castanedaii shows some plesiomorphic features such as the aforementioned presence of the i3 and the developed hypocone in the last upper molar. Its estimated body mass (1303 kg) is intermediate among Astrapotheriidae.http://zoobank.org/urn:lsid:zoobank.org:pub:82377B38-8B39-4D71-9117-FD17CB329238SUPPLEMENTAL DATA—Supplemental materials are available for this article for free at www.tandfonline.com/UJVP

Highlights

Astrapotheria is an order of extinct South American herbivores recorded throughout the continent, from the late Paleocene to middle Miocene
We describe Hilarcotherium castanedaii, gen. et sp. nov., an Uruguaytheriinae astrapothere from sediments of La Victoria Formation (middle Miocene) in the Tolima Department, Upper Magdalena Valley, Colombia
M1- m3, pillar: 0 = absent; 1 = present, as a column; 2 = present, lophoid, enclosing with the metalophid a minute fossetid (unordered) (Kramarz and Bond 2011)

Summary

Introduction

Astrapotheria is an order of extinct South American herbivores recorded throughout the continent, from the late Paleocene to middle Miocene. Published at: Vallejo-Pareja, M C; Carrillo, J D; Moreno-Bernal, J W; Pardo-Jaramillo, M; Rodriguez-Gonzalez, D F; Muñoz-Duran, J (2015). Juan.carrillo@pim.uzh.ch; 3 Department of Earth and Atmospheric Sciences, and Nebraska State Museum of Natural History, University of Nebraska-Lincoln, Lincoln NE 68588-3040, USA, jwmorenob@huskers.unl.edu; 4 Museo Geológico Nacional 'José Royo y Gómez', Servicio Geológico Colombiano, Diag. Upper incisors: 0 = present; 1 = absent (Cifelli 1993) 6.

Results

Conclusion