Naturwissenschaften

, 96:409 | Cite as

New carnivorous dinosaur from the Late Cretaceous of NW Patagonia and the evolution of abelisaurid theropods

  • Juan I. Canale
  • Carlos A. Scanferla
  • Federico L. Agnolin
  • Fernando E. Novas
Short Communication

Abstract

A nearly complete skeleton of the new abelisaurid Skorpiovenator bustingorryi is reported here. The holotype was found in Late Cenomanian–Early Turonian outcrops of NW Patagonia, Argentina. This new taxon is deeply nested within a new clade of South American abelisaurids, named Brachyrostra. Within brachyrostrans, the skull shortening and hyperossification of the skull roof appear to be correlated with a progressive enclosure of the orbit, a set of features possibly related to shock-absorbing capabilities. Moreover, the development of horn-like structures and differential cranial thickening appear to be convergently acquired within Abelisauridae. Based on the similarities between Skorpiovenator and carcharodontosaurid tooth morphology, we suggest that isolated teeth originally referred as post-Cenomanian Carcharodontosauridae most probably belong to abelisaurids.

Keywords

Patagonia Cretaceous Theropoda Abelisauridae 

Notes

Acknowledgements

We thank C. Albornoz, M. Berrondo, J. Castro, M. Castro, N. Gonzalez, A. Moretti, J. Ochoa, M. Ripoll, M. Soto, and R. Zapata for the excavation and preparation of the specimen; J. Ochoa for his detailed drawings; A. Haluza for their useful comments in early drafts of the manuscript; J. Calvo, R. Coria, A. Kramarz, C. Muñoz and J. Powell for access to specimens under their care; R. Candeiro and A. Martinelli for providing useful pictures of theropod teeth; and Matthew Lamanna and two anonymous reviewers for the useful comments they made that improved the quality of this paper. The Municipalidad of Villa El Chocón is thanked for their constant support. Financial assistance was received from Agencia Nacional de Promoción Científica y Técnica (PICTs 13.803 and 58) and Conicet (PIP 5153).

Supplementary material

114_2008_487_MOESM1_ESM.doc (78 kb)
Supplementary S1(DOC 78.5 KB)

References

  1. Apesteguía S, Candeiro R, Agnolín F (2004) Late Cretaceous dwarf carcharodontosaurids in Patagonia. Ameghiniana 41:6RGoogle Scholar
  2. Bonaparte JF (1991) The gondwanian theropod families Abelisauridae and Noasauridae. Hist Biol 5:1–25CrossRefGoogle Scholar
  3. Bonaparte JF, Novas FE (1985) Abelisaurus comahuensis, n. g., n. sp., Carnosauria del Cretácico tardío de Patagonia. Ameghiniana 21:259–265Google Scholar
  4. Bonaparte JF, Novas FE, Coria RA (1990) Carnotaurus sastrei Bonaparte, the horned, lightly built carnosaur from the middle Cretaceous of Patagonia. Contr Sci, Nat Hist Mus Los Angeles Cty 416:1–42Google Scholar
  5. Calvo JO, Rubilar-Rogers D, Moreno K (2004) A new Abelisauridae (Dinosauria: Theropoda) from northwest Patagonia. Ameghiniana 41:555–563Google Scholar
  6. Candeiro CRA, Martinelli AG, Avilla LS, Rich TH (2006) Tetrapods from the upper cretaceous (Turonian-Maastrichtian) Bauru Group of Brazil: a reappraisal. Cret Res 27:923–946CrossRefGoogle Scholar
  7. Carrano MT (2007) The appendicular skeleton of Majungasaurus crenatissimus (Theropoda: Abelisauridae) from the Late Cretaceous of Madagascar. J Vert Paleontol 27(suppl: mem 8):163–179CrossRefGoogle Scholar
  8. Carrano MT, Sampson SD (2008) The phylogeny of Ceratosauria (Dinosauria: Theropoda). J Syst Paleontol 6:183–236Google Scholar
  9. Carrano MT, Sampson SD, Forster CA (2002) The osteology of Masiakasaurus knopfleri, a small abelisauroid (Dinosauria: Theropoda) from the Late Cretaceous of Madagascar. J Vert Paleontol 22:510–534CrossRefGoogle Scholar
  10. Corbella H, Novas FE, Apesteguía S, Leanza HA (2004) First fission-track age for the dinosaur-bearing Neuquén Group (Upper Cretaceous), Neuquén Basin, Argentina. Rev Mus Argent Cienc Nat 6:227–232Google Scholar
  11. Coria RA, Salgado L (2000) A basal Abelisauria Novas, 1992 (Theropoda–Ceratosauria) from the Cretaceous of Patagonia, Argentina. GAIA 15:89–102Google Scholar
  12. Coria RA, Currie PJ (2006) A new carcharodontosaurid (Dinosauria, Theropoda) from the Upper Cretaceous of Argentina. Geodivers 28:71–118Google Scholar
  13. Coria RA, Chiappe LM, Dingus L (2002) A new close relative of Carnotaurus sastrei Bonaparte 1985 (Theropoda: Abelisauridae) from the Late Cretaceous of Patagonia. J Vert Paleontol 22:460–465CrossRefGoogle Scholar
  14. Kellner AWA, Campos DDA (2002) On a theropod dinosaur (Abelisauria) from the continental Cretaceous of Brazil. Arq Mus Nac, Rio de Janeiro 60:163–170Google Scholar
  15. Krause DW, Sampson SD, Carrano MT, O’Connor P (2007) Overview of the history of discovery, taxonomy, phylogeny, and biogeography of Majungasaurus crenatissimus (Theropoda: Abelisauridae) from the Late Cretaceous of Madagascar. J Vert Paleontol 27(suppl: mem 8):1–20CrossRefGoogle Scholar
  16. Martinelli AG, Forasiepi AM (2004) Late Cretaceous vertebrates from the Bajo de Santa Rosa (Allen Formation), Rio Negro, Argentina, with the description of a new sauropod dinosaur (Titanosauridae). Rev Mus Argent Cienc Nat, n. s. 6:257–305Google Scholar
  17. Novas FE, De Valais S, Vickers-Rich P, Rich T (2005) A large Cretaceous theropod from Patagonia, Argentina, and the evolution of carcharodontosaurids. Naturwissenschaften 92:226–230PubMedCrossRefGoogle Scholar
  18. O’Connor P (2007) The postcranial axial skeleton of Majungasaurus crenatissimus (Theropoda: Abelisauridae) from the Late Cretaceous of Madagascar. J Vert Paleontol 27(suppl: mem 8):127–162Google Scholar
  19. Sampson S, Witmer L (2007) Craniofacial anatomy of Majungasaurus crenatissimus (Theropoda: Abelisauridae) from the Late Cretaceous of Madagascar. J Vert Paleontol 27(suppl: mem 8):32–102CrossRefGoogle Scholar
  20. Sampson S, Witmer L, Forster C, Krause D, O’Connor P, Dodson P, Rovoavy F (1998) Predatory dinosaur remains from Madagascar: implications for the Cretaceous biogeography of Gondwana. Science 280:1048–1051PubMedCrossRefGoogle Scholar
  21. Sereno PC, Dutheil DB, Iarochene M, Larsson HC, Lyon GH, Magwene PM, Sidor CA, Varrichio DJ, Wilson JA (1996) Predatory dinosaurs from the Sahara and Late Cretaceous faunal differentiation. Science 272:986–991PubMedCrossRefGoogle Scholar
  22. Sereno PC, Wilson JA, Conrad JL (2004) New dinosaurs link southern landmasses in the Mid-Cretaceous. Proc R Soc Lond (B) 271:1325–1330CrossRefGoogle Scholar
  23. Smith JB (2007) Dental morphology and variation in Majungasaurus crenatissimus (Theropoda: Abelisauridae) from the Late Cretaceous of Madagascar. Soc Vertebr Pal: Memoir 8, J Vertebr Paleontol 27:103–126Google Scholar
  24. Veralli C, Calvo JO (2004) Dientes de terópodos carcharodontosáuridos del Turoniano superior-Coniaciano inferior del Neuquén, Patagonia, Argentina. Ameghiniana 41:587–590Google Scholar

Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  • Juan I. Canale
    • 1
    • 2
  • Carlos A. Scanferla
    • 1
    • 3
  • Federico L. Agnolin
    • 3
    • 4
  • Fernando E. Novas
    • 1
    • 3
  1. 1.CONICET, Consejo Nacional de Investigaciones Científicas y TécnicasBuenos AiresArgentina
  2. 2.Museo Municipal “Ernesto Bachmann”NeuquénArgentina
  3. 3.Museo Argentino de Ciencias Naturales “Bernardino Rivadavia”Buenos AiresArgentina
  4. 4.Área Paleontología. Fundación de Historia Natural “Félix de Azara”, Departamento de Ciencias Naturales y AntropologíaCEBBAD—Universidad MaimónidesBuenos AiresArgentina

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