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New azhdarchoid pterosaur (Pterosauria, Pterodactyloidea) with an unusual lower jaw from the Portezuelo Formation (Upper Cretaceous), Neuquén Group, Patagonia, Argentina.
An Acad Bras Cienc. 2017; 89(3 Suppl):2003-2012.AA

Abstract

A new azhdarchoid pterosaur from the Upper Cretaceous of Patagonia is described. The material consists of an incomplete edentulous lower jaw that was collected from the upper portion of the Portezuelo Formation (Turonian-Early Coniacian) at the Futalognko site, northwest of Neuquén city, Argentina. The overall morphology of Argentinadraco barrealensis gen. et sp. nov. indicates that it belongs to the Azhdarchoidea and probable represents an azhdarchid species. The occlusal surface of the anterior portion is laterally compressed and shows blunt lateral margins with a medial sulcus that are followed by two well-developed mandibular ridges, which in turn are bordered laterally by a sulcus. The posterior end of the symphysis is deeper than in any other azhdarchoid. This unique construction of the lower jaw suggests the existence of an elaborate interlocking mechanism with the upper jaw. Furthermore, although speculative, it is advocated here that Argentinadraco barrealensis might have used the lower jaw to obtain its prey by cutting or ploughing through unconsolidated sediment in shallow waters, a feeding behavior not previously proposed for pterosaurs.

Authors+Show Affiliations

Laboratório de Sistemática e Tafonomia de Vertebrados Fósseis, Departamento de Geologia e Paleontologia, Museu Nacional/Universidade Federal do Rio de Janeiro, Quinta da Boa Vista, São Cristóvão, 20940-040 Rio de Janeiro, RJ, Brazil.Grupo de Transferencia Proyecto Dino, Universidad Nacional del Comahue, Parque Natural Geo-Paleontológico Proyecto Dino, Ruta Provincial 51, Km 65, Neuquén, Argentina.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

29166530

Citation

Kellner, Alexander W A., and Jorge O. Calvo. "New Azhdarchoid Pterosaur (Pterosauria, Pterodactyloidea) With an Unusual Lower Jaw From the Portezuelo Formation (Upper Cretaceous), Neuquén Group, Patagonia, Argentina." Anais Da Academia Brasileira De Ciencias, vol. 89, no. 3 Suppl, 2017, pp. 2003-2012.
Kellner AWA, Calvo JO. New azhdarchoid pterosaur (Pterosauria, Pterodactyloidea) with an unusual lower jaw from the Portezuelo Formation (Upper Cretaceous), Neuquén Group, Patagonia, Argentina. An Acad Bras Cienc. 2017;89(3 Suppl):2003-2012.
Kellner, A. W. A., & Calvo, J. O. (2017). New azhdarchoid pterosaur (Pterosauria, Pterodactyloidea) with an unusual lower jaw from the Portezuelo Formation (Upper Cretaceous), Neuquén Group, Patagonia, Argentina. Anais Da Academia Brasileira De Ciencias, 89(3 Suppl), 2003-2012. https://doi.org/10.1590/0001-3765201720170478
Kellner AWA, Calvo JO. New Azhdarchoid Pterosaur (Pterosauria, Pterodactyloidea) With an Unusual Lower Jaw From the Portezuelo Formation (Upper Cretaceous), Neuquén Group, Patagonia, Argentina. An Acad Bras Cienc. 2017;89(3 Suppl):2003-2012. PubMed PMID: 29166530.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - New azhdarchoid pterosaur (Pterosauria, Pterodactyloidea) with an unusual lower jaw from the Portezuelo Formation (Upper Cretaceous), Neuquén Group, Patagonia, Argentina. AU - Kellner,Alexander W A, AU - Calvo,Jorge O, Y1 - 2017/09/25/ PY - 2017/06/22/received PY - 2017/09/04/accepted PY - 2017/11/23/entrez PY - 2017/11/23/pubmed PY - 2018/4/19/medline SP - 2003 EP - 2012 JF - Anais da Academia Brasileira de Ciencias JO - An Acad Bras Cienc VL - 89 IS - 3 Suppl N2 - A new azhdarchoid pterosaur from the Upper Cretaceous of Patagonia is described. The material consists of an incomplete edentulous lower jaw that was collected from the upper portion of the Portezuelo Formation (Turonian-Early Coniacian) at the Futalognko site, northwest of Neuquén city, Argentina. The overall morphology of Argentinadraco barrealensis gen. et sp. nov. indicates that it belongs to the Azhdarchoidea and probable represents an azhdarchid species. The occlusal surface of the anterior portion is laterally compressed and shows blunt lateral margins with a medial sulcus that are followed by two well-developed mandibular ridges, which in turn are bordered laterally by a sulcus. The posterior end of the symphysis is deeper than in any other azhdarchoid. This unique construction of the lower jaw suggests the existence of an elaborate interlocking mechanism with the upper jaw. Furthermore, although speculative, it is advocated here that Argentinadraco barrealensis might have used the lower jaw to obtain its prey by cutting or ploughing through unconsolidated sediment in shallow waters, a feeding behavior not previously proposed for pterosaurs. SN - 1678-2690 UR - https://www.unboundmedicine.com/medline/citation/29166530/New_azhdarchoid_pterosaur__Pterosauria_Pterodactyloidea__with_an_unusual_lower_jaw_from_the_Portezuelo_Formation__Upper_Cretaceous__Neuqu��n_Group_Patagonia_Argentina_ L2 - https://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017005022101&lng=en&nrm=iso&tlng=en DB - PRIME DP - Unbound Medicine ER -
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