Naturwissenschaften

, Volume 99, Issue 5, pp 369–377 | Cite as

The first definitive Asian spinosaurid (Dinosauria: Theropoda) from the early cretaceous of Laos

  • Ronan Allain
  • Tiengkham Xaisanavong
  • Philippe Richir
  • Bounsou Khentavong
Original Paper

Abstract

Spinosaurids are among the largest and most specialized carnivorous dinosaurs. The morphology of their crocodile-like skull, stomach contents, and oxygen isotopic composition of the bones suggest they had a predominantly piscivorous diet. Even if close relationships between spinosaurids and Middle Jurassic megalosaurs seem well established, very little is known about the transition from a generalized large basal tetanuran to the specialized morphology of spinosaurids. Spinosaurid remains were previously known from the Early to Late Cretaceous of North Africa, Europe, and South America. Here, we report the discovery of a new spinosaurid theropod from the late Early Cretaceous Savannakhet Basin in Laos, which is distinguished by an autapomorphic sinusoidal dorsosacral sail. This new taxon, Ichthyovenator laosensis gen. et sp. nov., includes well-preserved and partially articulated postcranial remains. Although possible spinosaurid teeth have been reported from various Early Cretaceous localities in Asia, the new taxon I. laosensis is the first definite record of Spinosauridae from Asia. Cladistic analysis identifies Ichthyovenator as a member of the sub-clade Baryonychinae and suggests a widespread distribution of this clade at the end of the Early Cretaceous. Chilantaisaurus tashouikensis from the Cretaceous of Inner Mongolia, and an ungual phalanx from the Upper Jurassic of Colorado are also referred to spinosaurids, extending both the stratigraphical and geographical range of this clade.

Keywords

Cretaceous Savannakhet basin Theropoda Spinosauridae Asia 

Supplementary material

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References

  1. Allain R (2002) Discovery of megalosaur (Dinosauria, Theropoda) in the Middle Bathonian of Normandy (France) and its implications for the phylogeny of basal Tetanurae. J Vertebr Paleontol 22:548–563CrossRefGoogle Scholar
  2. Allain R, Taquet P, Battail B, Dejax J, Richir P, Veran M, Sayarath P, Khenthavong B, Thamvirith P, Hom B (1997) Pistes de dinosaures dans les niveaux du Crétacé inférieur de Muong Phalane, province de Savannakhet (Laos). C R Acad Sci Paris 325:815–821CrossRefGoogle Scholar
  3. Allain R, Taquet P, Battail B, Dejax J, Richir P, Veran M, Limon-Duparcmeur F, Vacant R, Mateus O, Sayarath P, Khenthavong B, Phouyavong S (1999) Un nouveau genre de dinosaure sauropode de la Formation des Grès supérieurs (Aptien-Albien) du Laos. C R Acad Sci Paris 329:609–616CrossRefGoogle Scholar
  4. Amiot R, Buffetaut E, Lécuyer C, Wang X, Boudad L, Ding Z, Fourel F, Hutt S, Martineau F, Medeiros MA, Mo J, Simon L, Suteethorn V, Sweetman S, Tong H, Zhang F, Zhou Z (2010) Oxygen isotope evidence for semi-aquatic habits among spinosaurid theropods. Geology 38:139–142CrossRefGoogle Scholar
  5. Bailey JB (1997) Neural spine elongation in dinosaurs: sailbacks or buffalo-backs? J Paleontol 71:1124–1146Google Scholar
  6. Benson RBJ (2010) A description of Megalosaurus bucklandii (Dinosauria: Theropoda) from the Bathonian of the United Kingdom and the relationships of Middle Jurassic theropods. Zool J Linn Soc Lond 158:882–935CrossRefGoogle Scholar
  7. Benson RBJ, Xu X (2008) The anatomy and systematic position of the theropod dinosaur Chilantaisaurus tashuikouensis Hu, 1964 from the early cretaceous of Alanshan, People’s Republic of China. Geol Mag 145:778–789CrossRefGoogle Scholar
  8. Benson RBJ, Carrano MT, Brusatte SL (2010) A new clade of archaic large-bodied predatory dinosaurs (Theropoda: Allosauroidea) that survived to the latest Mesozoic. Naturwissenschaften 97:71–78PubMedCrossRefGoogle Scholar
  9. Britt BB (1991) Theropods of Dry Mesa Quarry (Morrison Formation, Late Jurassic), Colorado, with emphasis on the osteology of Torvosaurus tanneri. Brigham Young Univ Geol Stud 37:1–72Google Scholar
  10. Brusatte SL, Sereno PC (2008) Phylogeny of Allosauroidea (Dinosauria: Theropoda): comparative analysis and resolution. J Syst Palaeontol 6:155–182CrossRefGoogle Scholar
  11. Brusatte SL, Benson RBJ, Xu X (2010) The evolution of large-bodied theropod dinosaurs during the Mesozoic in Asia. J Iberian Geol 36:275–296CrossRefGoogle Scholar
  12. Buffetaut E (1991) On the age of the Cretaceous dinosaur-bearing beds of southern Laos. Newsl Stratigr 24:59–73Google Scholar
  13. Buffetaut E, Ingavat R (1986) Unusual theropod dinsoaur teeth from the upper Jurassic of Phu Wiang, northeastern Thailand. Rev Paleobiol 5:217–220Google Scholar
  14. Buffetaut E, Suteethorn V, Tong H (1996) The earliest known tyrannosaur from the Lower Cretaceous of Thailand. Nature 381:689–691Google Scholar
  15. Buffetaut E, Martill DM, Escuillié F (2004) Pterosaurs as part of a spinosaur diet. Nature 430:33PubMedCrossRefGoogle Scholar
  16. Buffetaut E, Suteethorn V, Tong H, Amiot R (2008) An early cretaceous spinosaurid theropod from southern China. Geol Mag 145:745–748CrossRefGoogle Scholar
  17. Buffetaut E, Cuny G, Le Loeuff J, Sutheethorn V (2009) Late Palaeozoic and Mesozoic continental ecosystems of SE Asia: an introduction. Geol Soc London, Spec Pub 315:1–5CrossRefGoogle Scholar
  18. Camp CL (1936) A new type of small bipedal dinosaur from the Navajo sandstone of Arizona. Bull Univ California Dept Geol Sci 24:39–53Google Scholar
  19. Carrano MT, Hutchinson JH, Sampson SD (2005) New information on Segisaurus halli, a small theropod dinosaur from the early Jurassic of Arizona. J Vertebr Paleontol 25:835–849CrossRefGoogle Scholar
  20. Charig AJ, Milner AC (1986) Baryonyx, a remarquable new theropod dinosaur. Nature 324:359–361PubMedCrossRefGoogle Scholar
  21. Charig AJ, Milner AC (1997) Baryonyx walkeri, a fish-eating dinosaur from the Wealden of Surrey. Bull Nat Hist Mus 53:11–70Google Scholar
  22. Currie PJ, Zhao XJ (1994) A new carnosaur (Dinosauria: Theropoda) from the Jurassic of Xinjiang, People’s Republic of China. Can J Earth Sci 30:2037–2081CrossRefGoogle Scholar
  23. Dal Sasso C, Maganuco S, Buffetaut E, Mendez MA (2005) New information on the skull of the enigmatic theropods Spinosaurus, with remarks on is size and affinities. J Vertebr Paleontol 25:888–896CrossRefGoogle Scholar
  24. de Broin F (2004) A new Shachemydinae (Chelonii, Cryptodira) from the lower cretaceous of Laos: preliminary data. C R Palevol 3:387–396CrossRefGoogle Scholar
  25. Galton PM, Jensen JA (1979) A new large theropod dinosaur from the UpperJurassic of Colorado. Brigham Young Univ Geol Stud 26:1–12Google Scholar
  26. Gauthier J (1986) Saurischian monophyly and the origin of birds. In: Padian K (ed) The origin of birds and the evolution of flight. Mem California Acad Sci. 8:1–55Google Scholar
  27. Goloboff P (1999) NONA (No Name) ver. 2. Tucumán, ArgentinaGoogle Scholar
  28. Hasegawa Y, Buffetaut E, Manabe M, Takakuwa Y (2003) A possible spinosaurid tooth from the Sebayashi formation (Lower Cretaceous), Gunma, Japan. Bull Gunma Mus Nat Hist 7:1–5Google Scholar
  29. Hoffet JH (1937) Note sur la géologie du Bas-Laos. Bull Serv Geol Indochine 24:1–22Google Scholar
  30. Hoffet JH (1942) Description de quelques ossements de Titanosauriens du Senonien du Bas-Laos. C R Séances Cons Rech Sci Indochine 1942:51–57Google Scholar
  31. Hoffet JH (1944) Description des ossements les plus caracteristiques appartenant a des Avipelviens du Senonien du Bas-Laos. Bull Cons Rech Sci Indochine 1944:179–186Google Scholar
  32. Holtz TR, Chapman RE, Lamanna MC (2004a) Mesozoic biogeography of Dinosauria. In: Weishampel DB, Dodson P, Osmólska H (eds) The Dinosauria, 2nd edn. University of California Press, Berkeley, pp 627–642Google Scholar
  33. Holtz TR, Molnar RE, Currie PJ (2004b) Basal Tetanurae. In: Weishampel DB, Dodson P, Osmólska H (eds) The Dinosauria, 2nd edn. University of California Press, Berkeley, pp 71–110Google Scholar
  34. Hone DWE, Xu X, Wang DA (2010) A probable baryonychine tooth from the late cretaceous of Henan Province, China. Vertebrata PalAsiatica 48:19–26Google Scholar
  35. Hu SY (1964) Carnosaurian remains from Alashan, inner Mongolia. Vertebrata Palasiatica 8:42–63Google Scholar
  36. Hutchinson JH (2001) The evolution of pelvic osteology and soft tissues on the line to extant birds (Neornithes). Zool J Linn Soc Lond 131:123–168CrossRefGoogle Scholar
  37. Huttenlocker AK, Rega E, Sumida SS (2010) Comparative anatomy and osteohistology of hyperelongate neural spines in the sphenacodontids Sphenacodon and Dimetrodon (Amniota: Synapsida). J Morphol 271:1407–1421PubMedCrossRefGoogle Scholar
  38. Ingavat R, Janvier P, Taquet P (1978) Découverte en Thaïlande d'une portion de fémur de dinosaure sauropode (Saurischia, Reptilia). CR Soc Geol France 3:140–141Google Scholar
  39. Marsh OC (1881) Principal characters of American Jurassic dinosaurs. Part V. Am J Sc 21:417–423Google Scholar
  40. Milner A, Buffetaut E, Suteethorn V (2007) A tall–spined spinosaurid theropod from Thailand and the biogeography of spinosaurs. J Vert Paleontol 27:118ACrossRefGoogle Scholar
  41. Naish D (2011) Theropod dinosaurs. In: Batten DJ (ed) English wealden fossils. The Palaeontological Association, London, pp 526–559Google Scholar
  42. Nixon KC (1999–2002) WinClada 1.00.08. Ithaca, N.Y., Nixon KCGoogle Scholar
  43. O’Connor PM (2007) The postcranial axial skeleton of Majungasaurus crenatissimus (Theropoda: Abelisauridae) from the late cretaceous of Madagascar. Mem Soc Vert Paleontol 8:127–162CrossRefGoogle Scholar
  44. Ortega F, Escaso F, Sanz JL (2010) A bizarre, humped Carcharodontosauria (Theropoda) from the Lower Cretaceous of Spain. Nature 467:203–206PubMedCrossRefGoogle Scholar
  45. Owen R (1842) Report on British fossil reptiles. Part II. Rep Br Assoc Adv Sci 1841:60–204Google Scholar
  46. Owen R (1855) Monograph of the fossil Reptilia of the Wealden and Purbeck formations. Part II. Dinosauria. Palaeontogr Soc Monogr 8:1–54Google Scholar
  47. Racey A, Goodall JGS (2009) Palynology and stratigraphy of the Mesozoic Khorat Group red bed sequences from Thailand. Geol Soc Lond Spec Pub 315:69–83CrossRefGoogle Scholar
  48. Rauhut OWM (2003) The interrelationships and evolution of basal theropod dinosaurs. Spec Pap Paleontol 69:1–215Google Scholar
  49. Rayfield EJ, Milner AC, Xuan VB, Young PG (2007) Functional morphology of spinosaur ‘crocodile-mimic’ dinosaurs. J Vertebr Paleontol 27:892–901CrossRefGoogle Scholar
  50. Russell DA (1994) The role of Central Asia in dinosaurian biogeography. Canadian Journal of Earth Sciences 30:2002–2012CrossRefGoogle Scholar
  51. Sereno PC, Beck AL, Dutheil DB, Gado B, Larsson HCE, Lyon GH, Marcot JD, Rauhut OWM, Sadleir RW, Sidor CA, Varricchio D, Wilson GP, Wilson JA (1998) A long-snouted predatory dinosaur from Africa and the evolution of spinosaurids. Science 282:1298–1302PubMedCrossRefGoogle Scholar
  52. Sha J (2007) Cretaceous trigonioidid (non-marine Bivalvia) assemblages and biostratigraphy in Asia with special remarks on the classification of Trigonioidacea. J Asian Earth Sci 29:62–83CrossRefGoogle Scholar
  53. Smith AG, Smith DG, Funnell BM (1994) Atlas of Mesozoic and Cenozoic. Cambridge University Press, CambridgeGoogle Scholar
  54. Smith JB, Lamanna MC, Mayr H, Lacovara KJ (2006) New information regarding the holotype of Spinosaurus aegyptiacus Stromer, 1915. J Paleontol 80:400–406CrossRefGoogle Scholar
  55. Smith ND, Makovicky PJ, Hammer WR, Currie PJ (2007) Osteology of Cryolophosaurus ellioti (Dinosauria: Theropoda) from the Early Jurassic of Antarctica and implications for early theropod evolution. Zool J Linn Soc Lond 151:377–421CrossRefGoogle Scholar
  56. Stovall JW, Langston W (1950) Acrocanthosaurus atokensis, a new genus and species of lower cretaceous Theropoda from Oklahoma. Am Midl Naturalist 43:696–728CrossRefGoogle Scholar
  57. Stromer E (1915) Ergebnisse der Forschungsreisen Prof E. Stromer in den Wüsten Ägyptens. II Wirbeltier-Reste der Baharïje-Stufe (unterstes Cenoman) 3: Das Original des theropoden Spinosaurus aegyptiacus nov gen nov spec. Abhandl K Bayer Akad Wiss Math-phys Kl 28:1–32Google Scholar
  58. Stromer E (1934) Ergebnisse der Forschungsreisen Prof Stromers in den Wüsten Ägyptens II Wirbeltier-Reste der Baharije-Stufe (unterstes Cenoman) 13: Dinosauria. Abhandl Bayer Akad Wiss Math Naturwiss Abt 22:1–79Google Scholar
  59. Sues HD, Frey E, Martill DM, Scott DM (2002) Irritator challengeri, a spinosaurid (Dinosauria: Theropoda) from the lower cretaceous of Brazil. J Vertebr Paleontol 22:535–547CrossRefGoogle Scholar
  60. Taquet P (1984) Une curieuse spécialisation du crâne de certains dinosaures carnivores du Crétacé: le museau long et étroit des spinosauridés. C R Acad Sci Paris II 299:217–222Google Scholar
  61. Taquet P (1994) Chercheur d’os au Laos. In : Commune d’Oberhausbergen (ed.), Josué H. Hoffet, d’Oberhausbergen au Laos, pp 49-62Google Scholar
  62. Taquet P, Russell DA (1998) New data on spinosaurid dinosaurs from the early cretaceous of the Sahara. C R Acad Sci Paris 327:347–353CrossRefGoogle Scholar
  63. Taquet P, Battail B, Dejax J, Richir P, Veran M (1995) First discovery of dinosaur footprints and new discoveries of dinosaur bones in the lower cretaceous of the Savannakhet Province, Laos. In: IGCP Symposium on Geology of SE Asia, Hanoi. J Geol 5–6:167Google Scholar
  64. Tykoski RS, Rowe T (2004) Ceratosauria. In: Weishampel DB, Dodson P, Osmólska H (eds) The Dinosauria, 2nd edn. University of California Press, Berkeley, pp 47–70Google Scholar
  65. Xu X, Clark JM, Forster CA, Norell MA, Erickson GM, Eberth DA, Jia C, Zhao Q (2006) A basal tyrannosauroid dinosaur from the late Jurassic of China. Nature 439:715–718PubMedCrossRefGoogle Scholar
  66. Xu X, Clark JM, Mo J, Choiniere J, Forster CA, Erickson GM, Hone DWE, Sullivan C, Eberth D, Nesbitt SJ, Zhao Q, Hernandez R, Jia CK, Han FL, Guo Y (2009) A Jurassic ceratosaur from China helps clarify avian digital homologies. Nature 459:940–944PubMedCrossRefGoogle Scholar
  67. Yates AM (2006) A new theropod dinosaur from the early jurassic of South Africa and its implications for the early evolution of theropods. Palaeontol Afr 41:105–122Google Scholar
  68. Zhao XJ, Currie PJ (1993) A large crested theropod from the Jurassic of Xinjiang, People’s Republic of China. Can J Earth Sci 30:2027–2036CrossRefGoogle Scholar
  69. Zhao XJ, Benson RBJ, Brusatte SL, Currie PJ (2010) The postcranial skeleton of Monolophosaurus jiangi (Dinosauria: Theropoda) from the Middle Jurassic of Xinjiang, China, and a review of Middle Jurassic Chinese theropods. Geol Mag 147:13–27CrossRefGoogle Scholar

Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  • Ronan Allain
    • 1
  • Tiengkham Xaisanavong
    • 2
  • Philippe Richir
    • 1
  • Bounsou Khentavong
    • 2
  1. 1.Département Histoire de la Terre, Centre de Recherches sur la Paléobiodiversité et les Paléoenvironnements (CR2P)Muséum National d’Histoire NaturelleParis cedex 05France
  2. 2.Science and Technology OfficeSavannakhet Dinosaur MuseumSavannakhetRépublique Démocratique Populaire Lao

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