Descripción de una nueva especie de bagre marino fósil (Teleostei, Siluriformes, Ariidae) del Mioceno de la provincia de Río Negro, Argentina

Authors

  • Sergio Bogan Universidad Maimónides; CEBBAD; Departamento de Ciencias Naturales y Antropología; Fundación de Historia Natural Félix de Azara
  • Federico L. Agnolin Museo Argentino de Ciencias Naturales Bernardino Rivadavia; Laboratorio de Anatomía Comparada y Evolución de los Vertebrados

DOI:

https://doi.org/10.1590/S0031-10492011002500001

Keywords:

Siluriformes, Ariidae, Genidens, Gran Bajo del Gualicho Formation, Patagonia

Abstract

Two fossil crania referable to the siluriform fish family Ariidae are described. The specimens come from the Early Late Miocene-Lower Middle Miocene Saladar Member of the Gran Bajo del Gualicho Formation, located at Salinas del Gualicho, Río Negro province, Argentina. The materials are referred to a new species of the recent genus Genidens. The new taxon is distinguished from remaining living species in having a very short, broadened and rounded supraoccipital process, subrounded extrascapular and wide mesethmoid with a median notch, flat frontals, and straight lateral margins of the sphenotics. Genidens ancestralis sp. nov. represents the oldest (and only known) fossil record for the genus, and constitutes a relatively small-sized species, very similar in general traits to living forms of Genidens.

Downloads

Download data is not yet available.

Published

2011-01-01

How to Cite

Bogan, S., & Agnolin, F. L. (2011). Descripción de una nueva especie de bagre marino fósil (Teleostei, Siluriformes, Ariidae) del Mioceno de la provincia de Río Negro, Argentina . Papéis Avulsos De Zoologia, 51(25), 373-382. https://doi.org/10.1590/S0031-10492011002500001

Issue

Section

naodefinida