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The earliest dromaeosaurid theropod from South America


The evolutionary history of Maniraptora, the clade of carnivorous dinosaurs that includes birds and the sickle-clawed Dromaeosauridae, has hitherto been largely restricted to Late Jurassic and Cretaceous deposits on northern continents. The stunning Early Cretaceous diversity of maniraptorans from Liaoning, China1,2,3, coupled with a longevity implied by derived Late Jurassic forms such as Archaeopteryx, pushes the origins of maniraptoran lineages back to Pangaean times and engenders the possibility that such lineages existed in Gondwana. A few intriguing, but incomplete, maniraptoran specimens have been reported from South America4,5,6,7,8, Africa9 and Madagascar10. Their affinities remain contested11,12,13, however, and they have been interpreted as biogeographic anomalies relative to other faunal components of these land-masses. Here we describe a near-complete, small dromaeosaurid that is both the most complete and the earliest member of the Maniraptora from South America, and which provides new evidence for a unique Gondwanan lineage of Dromaeosauridae with an origin predating the separation between northern and southern landmasses.

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Figure 1: Geographic and stratigraphic provenance of Buitreraptor gonzalezorum.
Figure 2: Buitreraptor gonzalezorum MPCA 245, holotype.
Figure 3: Buitreraptor gonzalezorum.
Figure 4: Relationships of Buitreraptor gonzalezorum within Coelurosauria.


  1. 1

    Hwang, S. H., Norell, M. A., Ji, Q. & Gao, K.-Q. New specimens of Microraptor zhaoianus (Theropoda: Dromaeosauridae) from Northeastern China. Am. Mus. Novit. 3381, 1–44 (2002)

    Article  Google Scholar 

  2. 2

    Xu, X., Wang, X.-L. & Wu, X.-C. A dromaeosaurid dinosaur with filamentous integument from the Yixian Formation of China. Nature 401, 262–266 (1999)

    ADS  CAS  Article  Google Scholar 

  3. 3

    Xu, X., Norell, M. A., Wang, X.-L., Makovicky, P. J. & Wu, X.-C. A basal troodontid from the Early Cretaceous of China. Nature 415, 780–784 (2002)

    ADS  CAS  Article  Google Scholar 

  4. 4

    Novas, F. E. Alvarezsauridae, Late Cretaceous maniraptorans from Patagonia and Mongolia. Queensland Mus. Mem. 39, 675–702 (1996)

    Google Scholar 

  5. 5

    Novas, F. E. & Puerta, P. F. New evidence concerning avian origins from the Late Cretaceous of Patagonia. Nature 387, 390–392 (1997)

    ADS  CAS  Article  Google Scholar 

  6. 6

    Novas, F. E. & Pol, D. New evidence on deinonychosaurian dinosaurs from the Late Cretaceous of Patagonia. Nature 3285, 858–861 (2005)

    ADS  Article  Google Scholar 

  7. 7

    Calvo, J. O., Porfiri, J. D. & Kellner, A. W. On a new maniraptoran dinosaur (Theropoda) from the Upper Cretaceous of Neuquén, Patagonia, Argentina. Arq. Mus. Nacional. Rio de Janeiro 62, 549–566 (2004)

    Google Scholar 

  8. 8

    Novas, F. E. & Agnolín, F. L. Unquillosaurus ceibali Powell, a giant maniraptoran (Dinosauria, Theropoda) from the Late Cretaceous of Argentina. Rev. Mus. Argentino Cienc. Nat. NS 6, 61–66 (2004)

    Article  Google Scholar 

  9. 9

    Rauhut, O. W. & Werner, C. First record of the family Dromaeosauridae (Dinosauria: Theropoda) in the Cretaceous of Gondwana (Wadi Milk Formation, Northern Sudan). Paläont. Z. 69, 475–489 (1995)

    Article  Google Scholar 

  10. 10

    Forster, C. A., Sampson, S. D., Chiappe, L. M. & Krause, D. The theropod ancestry of birds: new evidence from the Late Cretaceous of Madagascar. Science 279, 1915–1919 (1998)

    ADS  CAS  Article  Google Scholar 

  11. 11

    Clark, J. M., Norell, M. A. & Makovicky, P. J. in Mesozoic Birds: Above the Heads of Dinosaurs (eds Chiappe, L. M. L. & Witmer, L.) 31–64 (Univ. of California Press, Berkeley, 2002)

    Google Scholar 

  12. 12

    Novas, F. E. in Feathered Dragons: the Origin of Birds and Flight (eds Currie, P. J., Koppelhus, E., Shugar, M. & Wright, J. A.) 150–166 (Indiana Univ. Press, Bloomington, 2004)

    Google Scholar 

  13. 13

    Sereno, P. C. in New Perspectives on the Origin and Evolution of Birds: Proceedings of the International Symposium in Honor of John H. Ostrom (eds Gauthier, J. A. & Gall, L. F.) 69–98 (Peabody Mus. Nat. Hist., Yale Univ., New Haven, 2001)

    Google Scholar 

  14. 14

    Apesteguía, S., de Valais, S., González, J. A., Gallina, P. A. & Agnolin, F. L. The tetrapod fauna of ‘La Buitrera’, new locality from the basal Late Cretaceous of North Patagonia, Argentina. J. Vertebr. Paleontol. 21, 29A (2001)

    Google Scholar 

  15. 15

    Apesteguía, S. & Novas, F. E. Large Cretaceous sphenodontian from Patagonia provides insight into lepidosaur evolution in Gondwana. Nature 425, 609–612 (2003)

    ADS  Article  Google Scholar 

  16. 16

    Carignano, A. P., Pol, D., Apesteguía, S. & Novas, F. E. La diversidad de cocodrilos de ‘La Buitrera’ (Fm. Candeleros), provincia de Río Negro. Ameghiniana 39, 7R (2002)

    Google Scholar 

  17. 17

    Coria, R. & Salgado, L. A new giant carnivorous dinosaur from the Cretaceous of Patagonia. Nature 377, 224–226 (1995)

    ADS  CAS  Article  Google Scholar 

  18. 18

    Calvo, J. O. & Salgado, L. Rebbachisaurus tessonei sp. nov., a new Sauropoda from the Albian–Cenomanian of Argentina: new evidence on the origin of the Diplodocidae. Nat. Sci. Mus. Monogr. 15, 13–45 (1995)

    Google Scholar 

  19. 19

    Corbella, H., Novas, F. E., Apesteguía, S. & Leanza, H. A. First fission-track age for the dinosaur-bearing Neuquén Group (Upper Cretaceous), Neuquén basin, Argentina. Rev. Mus. Argentino Cienc. Nat. NS 6, 227–232 (2004)

    Article  Google Scholar 

  20. 20

    de Valais, S. & Apesteguía, S. Dientes asignables a Giganotosaurus (Carcharodontosauria, Theropoda) provenientes de ‘La Buitrera’, Fm. Candeleros, Provincia de Río Negro. Ameghiniana 38, 9R (2001)

    Google Scholar 

  21. 21

    Gallina, P. A., Apesteguía, S. & Novas, F. E. ¿Un elefante bajo la alfombra? Los Rebbachisauridae (Sauropoda, Diplodocimorpha) del Cretácico de Gondwana. Nuevas evidencias en ‘La Buitrera’ (Fm. Candeleros), provincia de Río Negro. Ameghiniana 39, 10R (2002)

    Google Scholar 

  22. 22

    Currie, P. J. New information on the anatomy and relationships of Dromaeosaurus albertensis (Dinosauria: Theropoda). J. Vertebr. Paleont. 15, 576–591 (1995)

    Article  Google Scholar 

  23. 23

    Makovicky, P. J., Norell, M. A., Clark, J. M. & Rowe, T. Osteology and relationships of Byronosaurus jaffei (Theropoda: Troodontidae). Am. Mus. Novit. 3402, 1–32 (2003)

    Article  Google Scholar 

  24. 24

    Bonaparte, J. F. Tetrapod faunas from South America and India: A palaeobiogeographic interpretation. Proc. Indian Nat. Sci. Acad. 65, 427–437 (1999)

    Google Scholar 

  25. 25

    Novas, F. E., Canale, J. I. & Isasi, M. Giant deinonychosaurian theropod from the Late Cretaceous of Patagonia. J. Vertebr. Paleont. 24 (Suppl.), 98A (2004)

    Google Scholar 

  26. 26

    Bonaparte, J. F. History of the terrestrial Cretaceous vertebrates of Gondwana. Actas IV Congr. Argentino Paleontol. Bioestrat. 4, 63–95 (1986)

    Google Scholar 

  27. 27

    Brochu, C. A. & Norell, M. A. Temporal congruence and the origin of birds. J. Vertebr. Paleont. 20, 197–200 (2000)

    Article  Google Scholar 

  28. 28

    Goloboff, P.A. NONA v.2.0. (published by the author, S.M. de Tucumán, Argentina, 1993).

  29. 29

    Nixon, K. Winclada (BETA) v.0.9.9. (published by the author, Ithaca, New York, 2000).

  30. 30

    Sereno, P. C. A rationale for phylogenetic definitions, with application to the higher-level taxonomy of Dinosauria. N. Jb. Geol. Paläont. Abh. 210, 41–83 (1998)

    Article  Google Scholar 

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We thank the Avelás and Salinas families, C. Muñoz, L. Fernández and the 2004 La Buitrera field crew for their help in the field; J. A. González, P. Chiarelli, M. Brown, J. Holstein, L. Herzog, A. Shinya, C. Van Beek and D. Wagner for preparing the holotype; J. Weinstein for photography, M. H. Donnelly for retouching Fig. 1; J. González for the reconstruction of Buitreraptor; S. de Valais for help and discussion during the early stages of this work; D. Pol for reading the manuscript and providing advice; and F. E. Novas and R. A. Coria for providing access to materials in their care. Fieldwork and preparation was facilitated by the Agencia Cultura of Río Negro Province and supported by The Jurassic Foundation (S.A.) and NASA (P.J.M.), and research was supported by the NSF (P.J.M.).

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Correspondence to Peter J. Makovicky or Sebastián Apesteguía.

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Makovicky, P., Apesteguía, S. & Agnolín, F. The earliest dromaeosaurid theropod from South America. Nature 437, 1007–1011 (2005).

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