NEOGENE ‘HORN SHARKS’ HETERODONTUS (CHONDRICHTHYES: ELASMOBRANCHII) FROM THE SOUTHEASTERN PACIFIC AND THEIR PALEOENVIRONMENTAL SIGNIFICANCE

Authors

  • Diego Partarrieu Universidad de Chile
  • Jaime A. Villafaña Department of Paleontology, University of Vienna, Geozentrum, Althanstrasse 14, 1090 Vienna, Austria
  • Luisa Pinto Departamento de Geología, Universidad de Chile, Plaza Ercilla 803, 8370450 Santiago, Chile
  • Francisco Amaro Mourgues Terra Ignota Heritage and Geosciences Consulting, Domingo Toro Herrera 1451, 7750144 Santiago, Chile
  • Pablo A. Oyanadel-Urbina Laboratorio de Paleobiología, Centro de Estudios Avanzados en Zonas Áridas (CEAZA), Av. Bernardo Ossandón 877, 1781681 Coquimbo, Chile
  • Marcelo M. Rivadeneira Laboratorio de Paleobiología, Centro de Estudios Avanzados en Zonas Áridas (CEAZA), Av. Bernardo Ossandón 877, 1781681 Coquimbo, Chile
  • Jorge D. Carrillo-Briceño Paleontological Institute and Museum, University of Zurich, Karl-Schmid-Strasse 4, 8006 Zu?rich, Switzerland

Keywords:

Miocene, Pliocene, Pleistocene, America, Chile, Fossil, Elasmobranchs, Extirpation

Abstract

Horn sharks (Elasmobranchii: Heterodontus Blainville) correspond to a genus of chondrichthyan fishes, mostly distributed in warmtemperate to tropical regions of the Pacific and Indian Oceans. The fossil record shows that, in contrast to its current distribution, horn sharks were widely distributed both in the eastern Pacific and western Atlantic during the Neogene, being subsequently extirpated from some of these areas. In this contribution, we describe new Heterodontus teeth from three Pliocene localities in the Coquimbo Region, in north-central Chile, and make an extensive revision of the fossil record of the genus in the Americas, in order to specify the timing of their extirpation in the southeastern Pacific and discuss the possible causes of this event. The new specimens described herein belong to a species with a Heterodontus francisci type dentition. Our analysis suggest that the removal of horn sharks occurred in the context of a general faunal turnover in the transition from Pliocene to Pleistocene, and that it was probably controlled by an interplay between the oceanographic, tectono-eustatic and ecological changes occurred in the region at that time.

Published

2018-12-28

How to Cite

Partarrieu, D., Villafaña, J. A., Pinto, L., Mourgues, F. A., Oyanadel-Urbina, P. A., Rivadeneira, M. M., & Carrillo-Briceño, J. D. (2018). NEOGENE ‘HORN SHARKS’ HETERODONTUS (CHONDRICHTHYES: ELASMOBRANCHII) FROM THE SOUTHEASTERN PACIFIC AND THEIR PALEOENVIRONMENTAL SIGNIFICANCE. Ameghiniana, 55(6), 651–667. Retrieved from https://www.ameghiniana.org.ar/index.php/ameghiniana/article/view/3202

Issue

Section

Articles

Most read articles by the same author(s)