A new rebbachisaurid sauropod from the Aptian–Albian, Lower Cretaceous Rayoso Formation, Neuquen, Argentina

• Autorzy: Canudo J.I. , Carballido J.L. , Garrido A. , Salgado L.
• Języki publikacji: EN

Abstrakty

EN

Rebbachisaurids are a group of basal diplodocimorph sauropods that diversified in Gondwana at the end of the Early Cretaceous and the beginning of the Late Cretaceous. It is a group of great palaeobiogeographical interest, for it clearly illustrates various processes of dispersal throughout Gondwana and to Laurasia prior to the breakup of Africa and South America. However, the relationships within the group are still under discussion owing to the scarcity of cranial material that would help clarify them. In the present paper we describe the new rebbachisaurid Lavocatisaurus agrioensis gen. et sp. nov. from the Aptian–Albian (Lower Cretaceous) of Neuquén (Argentina). Remains have been recovered belonging to an adult specimen (holotype) and two immature specimens (paratypes). Taken together, almost all the bones of the taxon are represented, including most of the cranium. Lavocatisaurus agrioensis gen. et sp. nov. is the first rebbachisaurid from Argentina with an almost complete cranium, making it possible to recognize differences with respect to other rebbachisaurids, such as the highly derived Nigersaurus. Among its most notable characters are the presences of a large preantorbital fenestra and maxillary teeth that are significantly larger than those of the dentary. Our phylogenetic study places Lavocatisaurus amongst basal rebbachisaurids, as the sister lineage to Khebbashia (the clade formed by Limaysaurinae + Rebbachisaurinae). This position, which is somewhat more derived than that previously suggested for Comahuesaurus and Zapalasaurus (the Argentinean rebbachisaurids closest in geographical and geological terms), reaffirms the presence of different basal rebbachisaurid lineages in the Early Cretaceous of Patagonia.

• Wydawca: -
• Czasopismo: Acta Palaeontologica Polonica
• Rocznik: 2018
• Tom: 63
• Numer: 4
• Opis fizyczny: p.679-691,fig.,ref.

Twórcy

autor

Canudo J.I.

• Recursos geologicos y paleoambientes; IUCA, Facultad de Ciencias, Universidad de Zaragoza 50009, C/ Pedro Cerbuna 12, Zaragoza, Spain

autor

Carballido J.L.

• CONICET-Museo “Egidio Feruglio”, Fontana 140, 9100 Trelew, Chubut, Argentina

autor

Garrido A.

• Museo Provincial de Ciencias Naturales “Prof. Dr. Juan Olsacher”, Direccion Provincial de Mineria, Etcheluz y Ejercito Argentino, 8340 Zapala, Neuquen, Argentina
• Departamento Geologia y Petroleo, Facultad de Ingenieria, Universidad Nacional del Comahue, Buenos Aires 1400, 8300 Neuquen, Neuquen, Argentina

autor

Salgado L.

• CONICET-Instituto de Investigacion en Paleobiologia y Geologia, Universidad Nacional de Rio Negro, Av. Gral. J.A. Roca 1242, 8332 General Roca, Rio Negro, Argentina

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Identyfikatory

DOI

10.4202/app.00524.2018