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New theropod dinosaur from the Upper Cretaceous of Patagonia sheds light on the paravian radiation in Gondwana.
Naturwissenschaften. 2020 May 28; 107(3):24.N

Abstract

The fossil record of basal paravians in Gondwana is still poorly known, being limited to the Cretaceous unenlagiids from South America and the problematic Rahonavis from Madagascar. Here we report on a new paravian from the Cenomanian-Turonian (Late Cretaceous) of Río Negro province, NW Patagonia, Argentina. The new taxon exhibits a derived bird-like morphology of the forelimbs (e.g., robust ulna with prominent, anteriorly oriented, and proximally saddle-shaped radial cotyle and wide medial flange on metacarpal I) and a plesiomorphic foot with a raptorial pedal digit II. Phylogenetic analysis recovers the new taxon in a monophyletic clade with Rahonavis, being the sister group of the remaining Avialae and more derived than other non-avian dinosaurs. Both exhibit derived forelimb traits in opposition with their plesiomorphic hind limbs. The position of the new taxon and Rahonavis as stem avialans indicates that Gondwanan basal paravians are represented by two different clades, at least. The new taxon probably constitutes a previously unknown grade in the avian-line theropods in which some flight-related adaptations of the forelimbs are present in cursorial taxa. The present discovery sheds light on the acquisition of flight-related traits in non-avian dinosaurs and on the still poorly known paravian radiation in Gondwana.

Authors+Show Affiliations

Laboratorio de Anatomía Comparada y Evolución de los Vertebrados, Museo Argentino de Ciencias Naturales "Bernardino Rivadavia", Av. Ángel Gallardo 470, C1405DJR, Buenos Aires, Argentina. matiasjmotta@gmail.com. CONICET, Consejo Nacional de Investigaciones Científicas y Técnicas, Buenos Aires, Argentina. matiasjmotta@gmail.com.Laboratorio de Anatomía Comparada y Evolución de los Vertebrados, Museo Argentino de Ciencias Naturales "Bernardino Rivadavia", Av. Ángel Gallardo 470, C1405DJR, Buenos Aires, Argentina. CONICET, Consejo Nacional de Investigaciones Científicas y Técnicas, Buenos Aires, Argentina. Fundación de Historia Natural "Félix de Azara", Universidad Maimónides, Hidalgo 775, C1405BDB, Buenos Aires, Argentina.Laboratorio de Anatomía Comparada y Evolución de los Vertebrados, Museo Argentino de Ciencias Naturales "Bernardino Rivadavia", Av. Ángel Gallardo 470, C1405DJR, Buenos Aires, Argentina. CONICET, Consejo Nacional de Investigaciones Científicas y Técnicas, Buenos Aires, Argentina.Laboratorio de Anatomía Comparada y Evolución de los Vertebrados, Museo Argentino de Ciencias Naturales "Bernardino Rivadavia", Av. Ángel Gallardo 470, C1405DJR, Buenos Aires, Argentina. CONICET, Consejo Nacional de Investigaciones Científicas y Técnicas, Buenos Aires, Argentina.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

32468191

Citation

Motta, Matías J., et al. "New Theropod Dinosaur From the Upper Cretaceous of Patagonia Sheds Light On the Paravian Radiation in Gondwana." Die Naturwissenschaften, vol. 107, no. 3, 2020, p. 24.
Motta MJ, Agnolín FL, Brissón Egli F, et al. New theropod dinosaur from the Upper Cretaceous of Patagonia sheds light on the paravian radiation in Gondwana. Naturwissenschaften. 2020;107(3):24.
Motta, M. J., Agnolín, F. L., Brissón Egli, F., & Novas, F. E. (2020). New theropod dinosaur from the Upper Cretaceous of Patagonia sheds light on the paravian radiation in Gondwana. Die Naturwissenschaften, 107(3), 24. https://doi.org/10.1007/s00114-020-01682-1
Motta MJ, et al. New Theropod Dinosaur From the Upper Cretaceous of Patagonia Sheds Light On the Paravian Radiation in Gondwana. Naturwissenschaften. 2020 May 28;107(3):24. PubMed PMID: 32468191.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - New theropod dinosaur from the Upper Cretaceous of Patagonia sheds light on the paravian radiation in Gondwana. AU - Motta,Matías J, AU - Agnolín,Federico L, AU - Brissón Egli,Federico, AU - Novas,Fernando E, Y1 - 2020/05/28/ PY - 2019/09/23/received PY - 2020/05/15/accepted PY - 2020/04/30/revised PY - 2020/5/30/entrez PY - 2020/5/30/pubmed PY - 2021/3/16/medline KW - Paraves KW - South America KW - Theropoda KW - Upper Cretaceous SP - 24 EP - 24 JF - Die Naturwissenschaften JO - Naturwissenschaften VL - 107 IS - 3 N2 - The fossil record of basal paravians in Gondwana is still poorly known, being limited to the Cretaceous unenlagiids from South America and the problematic Rahonavis from Madagascar. Here we report on a new paravian from the Cenomanian-Turonian (Late Cretaceous) of Río Negro province, NW Patagonia, Argentina. The new taxon exhibits a derived bird-like morphology of the forelimbs (e.g., robust ulna with prominent, anteriorly oriented, and proximally saddle-shaped radial cotyle and wide medial flange on metacarpal I) and a plesiomorphic foot with a raptorial pedal digit II. Phylogenetic analysis recovers the new taxon in a monophyletic clade with Rahonavis, being the sister group of the remaining Avialae and more derived than other non-avian dinosaurs. Both exhibit derived forelimb traits in opposition with their plesiomorphic hind limbs. The position of the new taxon and Rahonavis as stem avialans indicates that Gondwanan basal paravians are represented by two different clades, at least. The new taxon probably constitutes a previously unknown grade in the avian-line theropods in which some flight-related adaptations of the forelimbs are present in cursorial taxa. The present discovery sheds light on the acquisition of flight-related traits in non-avian dinosaurs and on the still poorly known paravian radiation in Gondwana. SN - 1432-1904 UR - https://www.unboundmedicine.com/medline/citation/32468191/New_theropod_dinosaur_from_the_Upper_Cretaceous_of_Patagonia_sheds_light_on_the_paravian_radiation_in_Gondwana_ L2 - https://dx.doi.org/10.1007/s00114-020-01682-1 DB - PRIME DP - Unbound Medicine ER -