Dinosaur origins: evidence from the footprint record

Abstract

Triassic tracks and trackways assigned to dinosaur trackmakers or closest relatives have been mentioned from several Middle to the latest Triassic successions from both northern and southern Pangea. At present, the earliest gondwanan records are those from the Middle Triassic Los Rastros Formation in west-central Argentina. A reanalysis of Los Rastros ichnites at the Ischichuca area, including new material, has revealed the presence of a more diverse ichnofauna than previously suspected. The ichnocoenosis includes several tracks and trackways of bipeds with functionally tridactyl digitigrade pes, well developed claws, and a parasagittal posture of the hindlimbs. Previously, some large tridactyl footprints from the Ischichuca area were allied to theropod dinosaurs, although no synapomophies are preserved in the three-toed footprints that might discriminate among theropods, basal saurischians and basal ornithischian groups as their possible trackmakers. If the Ischichuca trackmakers are referred to a dinosaur taxon and/or to a close dinosaur sister-taxon, their presence in the Los Rastros levels suggests that derived dinosauriforms (including dinosaurs) had diverged and acquired their characteristic functionally tridactyl pes by at least the Middle Triassic, something that the body-fossil record has failed to document to date.

Keywords:

• Footprints
• Dinosauria
• Triassic
• Los Rastros Formation
• Argentina

Acknowledgements

CM greatly acknowledge Diego Pol and Max Langer for inviting her to participate in the I Symposium of Early Dinosaur Evolution helded in Rio de Janeiro (Brasil) during August 2005. We specially thank Jeff Wilson (University of Michigan, USA), Diego Pol (Museo Paleontológico Egidio Feruglio, Argentina) and Marco Avanzini (Museo Tridentino di Scienze Naturali, Italy) for their critical reading of the manuscript and pertinent comments. Funding for this work was provided by PIP-CONICET 5120 to CM. Additional financial support was provided by the Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET).