NDLI: On a theropod scapula (Upper Cretaceous) from the Marília Formation, Bauru Group, Brazil

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On a theropod scapula (Upper Cretaceous) from the Marília Formation, Bauru Group, Brazil

Content Provider	Springer Nature Link
Author	Machado, Elaine Batista Campos, Diogenes de A. Kellner, Alexander W. A.
Copyright Year	2008
Abstract	The record of theropod dinosaurs in Brazil is very scarce. One of the most promising lithostratigraphic units for those reptiles is the Bauru Group. The dinosaur remains found in this unit are mainly those of sauropods, while theropods are represented mostly by teeth. Here we describe a right scapula (housed at the Earth Science Museum of the Departamento Nacional de Produção Mineral/Rio de Janeiro) that is the first theropod scapula reported from the Cretaceous of Brazil and only the second osteological evidence of the Tetanurae from the Bauru Group. The specimen was recovered from the outskirts of Peirópolis, in Minas Gerais State. Comparisons with other theropod dinosaurs are limited, but the overall morphology of the new specimen indicates that it is neither a member of the Abelisauridae nor a member of the Avialae. It also differs from more basal members of the Theropoda, but its overall shape is consistent with several derived members of the Tetanurae, likely a non-avialan maniraptoran. Despite the lack of precision in its taxonomic position, the new specimen confirms the presence of non-avialan Maniraptora in the Bauru Group.Der Fossilbericht theropoder Dinosaurier von Brasilien ist immer noch sehr dürftig. Eine der aussichtsreichsten Gesteinseinheiten für das Auffinden dieser Reptilien ist die Bauru-Gruppe. Bisher gefundene Dinosaurier aus dieser Einheit sind überwiegend Sauropoden, während Theropoden hauptsächlich durch Zähne vertreten sind. Wir beschreiben hier eine rechte Scapula (aufbewahrt im Geowissenschaftlichen Museum des Departamento Nacional de Produção Mineral/Rio de Janeiro), welche die erste Theropoden-Scapula aus der Kreide Brasiliens und erst den zweiten Skelett-Nachweis von Tetanuren aus der Bauru-Gruppe darstellt. Das Exemplar stammt aus der Umgebung von Peirópolis, im Bundestaat Minas Gerais. Obwohl Vergleiche mit anderen Theropoden limitiert sind, deutet die generelle Morphologie des Exemplares darauf hin, dass es sich weder um einen Abelisauriden noch um einen Avialen handelt. Es unterscheidet sich auch deutlich von den Scapulae anderer basaler Theropoden, ähnelt jedoch jenen fortschrittlicher Tetanuren und gehört höchstwahrscheinlich zu einem Maniraptoren außerhalb der Avialae. Trotz dieser Unsicherheit in der taxonomischen Zuordnung bestätigt dieses neue Material somit das Vorhandensein nichtavialer Maniraptoren in der Bauru-Gruppe.
Starting Page	308
Ending Page	313
Page Count	6
File Format	PDF
ISSN	00310220
Journal	Paläontologische Zeitschrift
Volume Number	82
Issue Number	3
e-ISSN	12369874
Language	English
Publisher	Springer-Verlag
Publisher Date	2008-01-01
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Dinosauria Theropoda Scapula Bauru-Gruppe obere Kreide Brasilien Paleontology
Content Type	Text
Resource Type	Article
Subject	Paleontology

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