Definition and diagnosis of a new tribe of sigmodontine rodents (cricetidaesigmodontinae), and a revised classification of the subfamily

• Guillermo D'Elía ^[1] ; Ulyses F. J Pardiñas ^[3] ; Pablo Teta ^[2] ; James L Patton ^[4]
  1. [1] Universidad de Concepción

     Universidad de Concepción

     Comuna de Concepción, Chile

     
  2. [2] Universidad de Buenos Aires

     Universidad de Buenos Aires

     Argentina

     
  3. [3] Centro Nacional Patagónico
  4. [4] University of California Museum of Vertebrate Zoology

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• Localización: Gayana, ISSN-e 0717-6538, ISSN 0717-652X, Vol. 71, Nº. 2, 2007, págs. 187-194
• Idioma: inglés
• Títulos paralelos:
  • Definición y diagnosis de una tribu de roedores sigmodontinos (cricetidae sigmodontinae), y una clasificación revisada de la subfamilia
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• Resumen

  • A new tribe of sigmodontine rodents is formally defined and diagnosed. The tribe contains the extant genera Abrothrix (including Chroeomys), Chelemys, Geoxus, Pearsonomys, and Notiomys, a group of taxa distributed in the central and southern Andes and lowlands both east and west of the cordillera. The new tribe presents a unique combination of characters including nasals and premaxilla usually projected anterior to the incisors, moderately trumpeted; zygomatic plate with upper free border reduced or obsolete; and third upper molar reduced and sub-cylindrical in out-line with an internal ring-like enamel fossette. Molecular phylogenetic analyses indicate that Abrothrix is sister to a clade containing the remaining genera of the new tribe.