, Volume 92, Issue 5, pp 226–230 | Cite as

A large Cretaceous theropod from Patagonia, Argentina, and the evolution of carcharodontosaurids

  • Fernando E. NovasEmail author
  • Silvina de Valais
  • Pat Vickers-Rich
  • Tom Rich
Short Communication


The Cretaceous Carcharodontosauridae is the latest clade of carnosaurs, including the largest predatory dinosaurs yet recorded. Albeit spectacular for their size, the skeletal anatomy of these theropods remains poorly-known, and their diversity was until recently restricted to two Cenomanian species: the highly derived Giganotosaurus carolinii, from southern South America, and the incompletely known Carcharodontosaurus saharicus, from northern Africa. Here we describe an older and basal member of the group, Tyrannotitan chubutensis gen. et sp. nov., from Aptian strata of Patagonia, Argentina. The new taxon gives new insights into the systematics and evolution of carcharodontosaurids and offers a better understanding of the evolution of Southern theropod faunas. We suggest that carcharodontosaurids radiated in Gondwana sharing with spinosaurids the role of top-predators until their extinction in Cenomanian–Turonian times. During this interval, the diplodocoid sauropods and giant titanosaurians went extinct (probably as part of a global-scale crisis), and the smaller abelisaurid theropods took dominance, reigning until the end of the Cretaceous. Electronic Supplementary Material is available.


Cretaceous Cenomanian Turonian Neural Spine Chubut Province 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



We thank L. Guerrero, P. Puerta, R. Vacca and their team for the discovery, excavation and preparation of the specimens; L. Salgado, P. Currie, and P. Posadas for suggestions on early drafts; and R. Coria and R. Carolini for access to specimen of Giganotosaurus carolinii. Finnancial support received from Agencia Nacional de Promoción Científica y Técnica, CONICET, National Geographic Society, and The Jurassic Foundation (to FEN) is gratefully acknowledged. Fieldwork was sponsored by Museo Paleontológico “Egidio Feruglio.”

Supplementary material

114_2005_623_ESM_supp.pdf (312 kb)
(PDF 312 KB)


  1. Apesteguía S (2004) Bonitasaura salgadoi gen. et sp. Nov.: a beaked sauropod from the Late Cretaceous of Patagonia. Naturwissenschaften 91:493–497Google Scholar
  2. Bakker RT (1977) Tetrapod mass extinctions—a model of the regulation of speciation rates and inmigration by cycles of topographic diversity. In: Hallam A (ed) Patterns of evolution as illustrated by the fossil record. Elsevier Scientific Publishing, Amsterdam, pp439–468Google Scholar
  3. Britt BB, Stadman KL (1997) Dalton Wells Quarry. In: Currie P, Padian K (eds) Encyclopaedia of dinosaurs, Academic Press, New York, pp 165–166Google Scholar
  4. Calvo JO (1999) Dinosaurs and other vertebrates of the Lake Ezequiel Ramos Mexía Area, Neuquén-Patagonia, Argentina. In: Tomida Y, Rich TH, Vickers-Rich P (eds) Proceedings of the Second Gondwanan Dinosaur Symposium, National Science Museum Monographs 15, Tokyo, pp 13–45Google Scholar
  5. Calvo JO, Coria RA (2000) New specimen of Giganotosaurus carolinii (Coria and Salgado, 1995), supports it as the largest theropod ever found. GAIA 15:117–122Google Scholar
  6. Carrano MT, Sampson SD and Forster CA (2002) The osteology of Masiakasaurus knopfleri, a small abelisauroid (Dinosauria: Theropoda) from the Late Cretaceous of Madagascar. J Vert Paleontol 22:510–534Google Scholar
  7. Chiappe LM, Salgado L, Coria RA (2001) Embryonic skulls of titanosaur sauropod dinosaurs. Science 293:2444–2446Google Scholar
  8. Codignotto J, Nullo F, Panza J, Proserpio C (1978) Estratigrafía del Grupo Chubut entre Paso de Indios y Las Plumas, Provincia del Chubut, Argentina. Actas VII Congreso Geológico Argentino, pp 471–480Google Scholar
  9. Coria RA, Currie PJ (2003) The braincase of Giganotosaurus carolinii, (Dinosauria: Theropoda) from the Upper Cretaceous of Argentina. J Vertebr Paleontol 4:802–811Google Scholar
  10. Coria RA, Salgado L (1995) A new giant carnivorous dinosaur from the Cretaceous of Patagonia. Nature 377:224–226Google Scholar
  11. Currie PJ (1996) Out of Africa: meat-eating dinosaurs that challenge Tyrannosaurus rex. Science 272:971–972Google Scholar
  12. Currie PJ, Carpenter K (2000) A new specimen of Acrocanthosaurus atokensis (Theropoda, Dinosauria) from the Lower Cretaceous Antlers Formation (Lower Cretaceous, Aptian) of Oklahoma, USA. Geodiversitas 22:207–246Google Scholar
  13. Currie Rogers K, Forster C (2004) The skull of Rapetosaurus krausei (Sauropoda: Titanosauria) from the Late Cretaceous of Madagascar. Journ Vert Pal 24:121–144Google Scholar
  14. Harris JD (1998) A reanalysis of Acrocanthosaurus atokensis, its phylogenetic status and paleobiogeographic implications, based on a new specimen from Texas. Bull New Mexico Mus Nat Hist Sci 13:1–75Google Scholar
  15. Holtz TR (2000) A new phylogeny of the carnivorous dinosaurs. GAIA 15:5–61Google Scholar
  16. Kirkland J (1997) Cedar Mountain Formation. In: Currie P, Padian K (eds) Encyclopaedia of Dinosaurs, Academic Press, New York, pp 98–99Google Scholar
  17. Musacchio E, Chebli W (1975) Ostrácodos no marinos y carófitas del Cretácico inferior de las provincias de Chubut y Neuquén, Argentina. Ameghiniana 12:70–96Google Scholar
  18. Rauhut OWM (2003) The interrelationships and evolution of basal theropod dinosaurs. Special Papers in Palaeontology 69:1–213Google Scholar
  19. Rich TH, Vickers-Rich P, Novas F, Cúneo R, Puerta P, Vacca R (2000) Theropods from the “Middle” Cretaceous Chubut Group of the San Jorge sedimentary basin, Central Patagonia. A preliminary note. GAIA 15:111–115Google Scholar
  20. Russell DA (1996) Isolated dinosaur bones from the Middle Cretaceous of the Tafilalt, Morocco. Bulletin du Muséum National d’Histoire Naturelle de Paris, 18:349–363Google Scholar
  21. Salgado L (2003) Los Saurópodos de Patagonia: sistemática evolución y paleobiologia. II Jornalas internacionales sobre paleontologia de Dinosaurios y su Entorno, Actas, Sala de Los Inpantes, España, pp 139–168Google Scholar
  22. Sereno PC, Beck AL, Dutheil DB, Gado B, Larsson HC, Lyon GH, Marcot JD, Rauhut OWM, Sadleir RW, Sidor CA, Varrichio DJ, Wilson GP, Wilson JA (1998) A long-snouted predatory dinosaur from Africa and the evolution of the spinosaurids. Science 282:1298–1300Google Scholar
  23. Sereno PC, Beck AL, Dutheil DB, Larsson HCE, Lyon GH, Moussa B, Sadleir RW, Sidor CA, Varricchio DJ, Wilson GP, Wilson JA (1999) Cretaceous sauropods from the Sahara and the uneven rate of skeletal evolution among dinosaurs. Science 286:1342–1347Google Scholar
  24. 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 272:986–991Google Scholar
  25. Sereno PC, Larsson HCE, Sidor CA, Gado B (2001) The giant crocodyliform Sarcosuchus from the Cretaceous of Africa. Science 294:1516–1519Google Scholar
  26. Smith JB, Lamanna MC, Lacovara KJ, Dodson P, Smith JR, Poole JC, Giegengack R, Attia Y (2001) A giant sauropod dinosaur from an Upper Cretaceous mangrove deposit in Egypt. Science 292:1704–1706Google Scholar
  27. Stromer E (1931) Wirbeltierreste der Baharíje-Stufe (unterstes Cenoman). 10. Ein Skelett-Rest von Carcharodontosaurus nov. gen. Abh. bayer. Akad. Wissensch., math-naturwiss. Abt., N.F. 9:1–23Google Scholar
  28. Stromer E (1934) Wirbeltierreste der Baharíje-Stufe (unterstes Cenoman). 13. Dinosauria. Abh. bayer. Akad. Wissensch., math-naturwiss. Abt., N.F. 22:1–79Google Scholar
  29. Stromer E (1936) 7.Wirbeltierreste der Baharíje-Stufe (unterstes Cenoman). Baharije-Kesse und Stufe mit deren Fauna und Flora Eine erganzende Zusammenfassung. Abh. bayer. Akad. Wissensch., math-naturwiss. Abt., N.F. 33:1–102Google Scholar

Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  • Fernando E. Novas
    • 1
    Email author
  • Silvina de Valais
    • 2
  • Pat Vickers-Rich
    • 3
  • Tom Rich
    • 4
  1. 1.CONICET, Museo Argentino de Ciencias Naturales “Bernardino Rivadavia”Buenos AiresArgentina
  2. 2.CONICET, Museo Paleontológico “Egidio Feruglio”TrelewArgentina
  3. 3.School of GeosciencesMonash UniversityMelbourne (Clayton)Australia
  4. 4.Museum VictoriaMelbourneAustralia

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