Naturwissenschaften

, Volume 99, Issue 5, pp 369–377

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

Authors

    • Département Histoire de la Terre, Centre de Recherches sur la Paléobiodiversité et les Paléoenvironnements (CR2P)Muséum National d’Histoire Naturelle
  • Tiengkham Xaisanavong
    • Science and Technology OfficeSavannakhet Dinosaur Museum
  • Philippe Richir
    • Département Histoire de la Terre, Centre de Recherches sur la Paléobiodiversité et les Paléoenvironnements (CR2P)Muséum National d’Histoire Naturelle
  • Bounsou Khentavong
    • Science and Technology OfficeSavannakhet Dinosaur Museum
Original Paper

DOI: 10.1007/s00114-012-0911-7

Cite this article as:
Allain, R., Xaisanavong, T., Richir, P. et al. Naturwissenschaften (2012) 99: 369. doi:10.1007/s00114-012-0911-7

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

114_2012_911_MOESM1_ESM.pdf (10.3 mb)
ESM 1 (PDF 10532 kb)

Copyright information

© Springer-Verlag 2012