Abstract
We report the finding of new remains of palaeothentid marsupials (Paucituberculata: Marsupialia) from the late Oligocene of Salla, Bolivia (Deseadan South American Land Mammal Age). These fossils represent two new taxa, Antawallathentes illimani and Antawallathentes quimsacruza, increasing the known number of Deseadan palaeothentoid species to 11. Antawallathentes illimani is represented by two incomplete skulls and A. quimsacruza is known only from the holotype, a partial mandible with p3 - m4. Our phylogenetic analysis, based on a data matrix modified from that of Abello, suggests that the two new Salla species are members of the Palaeothentidae (sensu stricto) and are more closely related to each other than they are to other known palaeothentids. Although these new taxa inidicate a greater diversity of Deseadan palaeothentoids than previously appreciated, nowhere in the Deseadan are palaeothentoids abundant, as they are in later Colhuehuapian and Santacrucian faunas. Thus, Deseadan palaeothentoid species richness, coupled with the observation that these palaeothentoids are numerically few in Deseadan faunas, permits the development of a general outline of the post-Eocene palaeothentoid radiation. This may be summarized as follows: 1) EOB Pulse that began near the Eocene/Oligocene Boundary; 2) Deseadan Diversification, increased species richness without large population sizes; and 3) Early Miocene Diversification, increased species richness with local abundances. This Colhuehuapian to Santacrucian diversity with local abundences declined after the Santacrucian. Palaeothentoids are unknown after the Laventan SALMA.
Resumen
Reportamos el hallazgo de nuevos restos de marsupiales palaeonthentidos (Paucituberculata:Marsupialia) del Oligoceno Tardío de Salla, Bolivia (Edad Mamífero Suramericana Deseadense). Estos fósiles representan dos nuevos taxa Antawallathentes illimani y A. quimsacruza, los cuales incrementan el número de especies de palaeothentoideos Deseadenses a once. Antawallathentes illimani esta representado por dos cráneos incompletos y A. quimsacruza solo se conoce por el holotipo, una mandíbula parcial con p3 - m4. Nuestro análisis filogenético, mayormente basado en la matriz de Abello, sugiere que los dos nuevos ejemplares de Salla son miembros de Palaeothentidae (sensu stricto) y están más cercanamente relacionados entre ellos que con los otros palaeothentidos conocidos. Aunque estos nuevos taxa indican una gran diversidad de palaeothentoideos Deseadenses nunca antes vista, en ninguna parte en le Deseadense son abundantes del palaeothentoideos, como lo son el en las faunas del Colhuehuapiense o el Santacrusense. Así, la riqueza de especies de palaeothentoideos Deseadenses, asociado con la observación que estos palaeothentoideos son numéricamente pocos en las faunas Deseadenses, permite el desarrollo de un bosquejo general de la radiación post-Eocena de los palaeothentoideos. Esto se podría resumir de la siguiente manera: 1) Pulso EOB (Eocene-Oligocene Boundary) incrementan el número de especies paleothentoideos que comienza cerca del limite Eoceno/Oligoceno; 2) Diversificación Deseadense, sin grandes tamaños poblacionales; y 3) Diversificación del Mioceno Temprano con abundancias locales. Esta diversidad con abundancias locales en las faunas locales del Colhuehuapiense y Santacrusense declina después del Santacrusense. Los palaeothentoideos son desconocidos después del SALMA La Ventense.
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Acknowledgments
We are grateful to Agustín Pérez Lozano of the Facultad de Ingeniería Geológica, Universidad Autónoma Tomás Frías, Potosí, Bolivia (UATF), who provided a vehicle for our field work to Salla and permitted our studies in the lab at UATF, and to Fidel Mamani Choque, also of UATF, who served as driver and occasional cook, along with the master sheep chefs of Sahalla—Jacinto and Daniel Calle. We are also grateful to Richard Hulbert, Bruce J. MacFadden, and Jonathan Bloch of the University of Florida, who facilitated our studies at the Florida Museum of Natural History, and to Chris Norris and Daniel Brinkman of the Yale Peabody Museum for all their help there. BJS also wishes to thank Ruth O’Leary, John Flynn, and Susan Bell for the liberal access given him to the research collections and to the Osborn Library of the American Museum of Natural History. This work benefited from having the author of the matrix upon which the phylogenetic analysis is based –M.A. Abello of the Museo de La Plata – serving as a one of the reviewers. Her experience and efforts led her to detect a variety of errors in an earlier version of this work. Of course, we are solely responsible for any errors that may remain. We are also grateful to an anonymous reviewer and to John R. Wible of the Carnegie Museum of Natural History for their critiques and suggestions. This work was supported by a grant from the Venezuelan Science and Technology Ministry (IVIC-1096 to ADR) and a Summer Research Grant from Manhattan College (to BJS).
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Rincón, A.D., Shockey, B.J., Anaya, F. et al. Palaeothentid Marsupials of the Salla Beds of Bolivia (Late Oligocene): Two New Species and Insights into the Post-Eocene Radiation of Palaeothentoids. J Mammal Evol 22, 455–471 (2015). https://doi.org/10.1007/s10914-015-9295-8
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DOI: https://doi.org/10.1007/s10914-015-9295-8