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A new titanosaur sauropod dinosaur from the Upper Cretaceous of North Patagonia, Argentina

100%

Filippi L. S., Garcia R. A., Garrido A. C.

Acta Palaeontologica Polonica

2011

tom 56

nr 3

A new sauropod titanosaur from the Upper Cretaceous Anacleto Formation is described. Narambuenatitan palomoi gen. et sp. nov., is diagnosed by cranial and axial autapomorphies. The holotype, which represent a subadult individual, consists of the left premaxilla and maxilla, braincase, both quadrates, one cervical vertebrae, one dorsal vertebra, fragments of cervical and dorsal ribs, seventeen caudal vertebrae, caudal transverse processes, fragments of haemal arches, left sternal plate, right coracoid, left humerus, left ulnae, both pubes, iliac pedicel, proximal fragment of right ischia, and an incomplete left femur. The phylogenetic analysis indicates that Narambuenatitan is a non−eutitanosaurian lithostrotian, and that it shares with Epachthosaurus a neural spine in middle caudal vertebrae which are laminar and posteriorly elongated.

Osteology of the sauropod embryos from the Upper Cretaceous of Patagonia

100%

Salgado L., Coria R. A., Chiappe L. M.

Acta Palaeontologica Polonica

2005

tom 50

nr 1

Exceptionally well−preserved embryonic skulls of Upper Cretaceous (Campanian Anacleto Formation) sauropods from Auca Mahuevo (Neuquén Province, Argentina) provide important insights into the ontogeny and evolution of titanosaurian neosauropods. The most important cranial modifications occurring during titanosaurian ontogeny appear to be centered on the infraorbital and narial regions, which exhibit a substantial degree of “mosaic” evolution. On one hand, the Auca Mahuevo embryos show a large jugal that forms part of the lower margin of the skull and unretracted external nares, as indicated by the position and orientation of the lacrimals as well as the anterior extension of the frontals. Both of these features are ancestral for neosauropods, being present in prosauropods. On the other hand, the embryonic skull exhibits a large ventral notch, tentatively interpreted as homologous to the neosauropod preantorbital fenestra, that opens ventral to the jugal and between the maxilla and the quadratojugal, and a temporal region that closely resembles the adult neosauropod condition. This mosaic of character states indicates that different regions of the skull of titanosaurian neosauropods acquired their characteristic morphology at substantially different rates during their ontogenetic development.

Ograniczanie wyników

2 Acta Palaeontologica Polonica

1 Chiappe L. M.

1 Coria R. A.

1 Filippi L. S.

1 Garcia R. A.

1 Garrido A. C.

1 Salgado L.

1 2011

1 2005

Wyniki wyszukiwania

A new titanosaur sauropod dinosaur from the Upper Cretaceous of North Patagonia, Argentina

Osteology of the sauropod embryos from the Upper Cretaceous of Patagonia