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The Rise of Non-Titanosaur Macronarians in South America

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South American Sauropodomorph Dinosaurs

Part of the book series: Springer Earth System Sciences ((SPRINGEREARTH))

Abstract

Although the origin of Neosauropoda probably dates back to the Early–Middle Jurassic, it is not until the Late Jurassic that Macronaria become well represented in the fossil record. Unlike the great diversity of South American titanosaurs, basal macronarians are relatively scarce in the fossil record; even so, they provide valuable information for better understanding the first steps at the origin of this clade. The only non-titanosauriform macronarian sauropod from South America is Tehuelchesaurus from the Oxfordian-Tithonian of Argentina, while all other basal macronarians found up to date are titanosauriforms (either Brachiosauridae or Somphospondyli). Brachiosaurids were abundant in the Jurassic, but they apparently became extinct at the Jurassic/Cretaceous boundary all over the world except in North America. Isolated elements from the Late Jurassic of Argentina and Padillasaurus from the Early Cretaceous of Colombia were suggested as brachiosaurids, but these assignments are questionable. Until now, no clear somphospondylans have been recorded in Jurassic levels. In South America, basal, non-titanosaur somphospondylans are represented by three taxa registered in Argentina: Chubutisaurus and Ligabuesaurus from the Early Cretaceous (Aptian–Albian) and Malarguesaurus from the Late Cretaceous (Turonian–Coniacian). Here, we provide a complete revision on the fossil record of non-titanosaur macronarians from South America and the current phylogenetic status of them.

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Acknowledgements

This contribution was financed with funds of the PICT ANPCyT 1925 ‘La fauna de saurópodos del Cretácico “medio” de Patagonia, evolución y diversificación de los Rebbachisauridae y Somphospondyli, aspectos evolutivos y ecológicos’ (José L. Carballido, director) and the Plurianual Project CONICET Nº 11220130100683CO, ‘Diversidad y evolución de las asociaciones de dinosaurios del Cretácico Temprano de la Cuenca Neuquina. Faunas y floras asociadas’ (Rodolfo Coria, director). We really appreciate the comments made by the reviewers J.I. Canudo and R. Santucci, whose suggestions improved the quality of this manuscript.

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Authors and Affiliations

  1. Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina

    Jose L. Carballido, Flavio Bellardini & Leonardo Salgado

  2. Museo Paleontológico Egidio Feruglio, Fontana 140, Trelew (9100), Chubut, Argentina

    Jose L. Carballido

  3. Instituto de Investigación en Paleobiología y Geología, Universidad Nacional de Río Negro, Av. Gral. J.A. Roca 1242, 8332, General Roca, Río Negro, Argentina

    Flavio Bellardini & Leonardo Salgado

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  1. Jose L. Carballido
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  2. Flavio Bellardini
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  3. Leonardo Salgado
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Correspondence to Jose L. Carballido .

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  1. Facultad de Ciencias Naturales y Museo, CONICET - Consejo Nacional de Investigaciones Científicas y Técnicas, La Plata, Argentina

    Alejandro Otero

  2. Museo Paleontológico Egidio Feruglio, CONICET - Consejo Nacional de Investigaciones Científicas y Técnicas, Trelew, Argentina

    José L. Carballido

  3. Museo Paleontológico Egidio Feruglio, CONICET - Consejo Nacional de Investigaciones Científicas y Técnicas, Trelew, Argentina

    Diego Pol

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Carballido, J.L., Bellardini, F., Salgado, L. (2022). The Rise of Non-Titanosaur Macronarians in South America. In: Otero, A., Carballido, J.L., Pol, D. (eds) South American Sauropodomorph Dinosaurs. Springer Earth System Sciences. Springer, Cham. https://doi.org/10.1007/978-3-030-95959-3_7

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