About the Authors

Daniel Vidal

rickraptor@me.com

Affiliation Unidad de Paleontología, Universidad Autónoma de Madrid, Cantoblanco, Madrid, Spain

Francisco Ortega

Affiliation Grupo de Biología Evolutiva, Universidad Nacional de Educación a Distancia, Madrid, Madrid, Spain

José Luis Sanz

Affiliation Unidad de Paleontología, Universidad Autónoma de Madrid, Cantoblanco, Madrid, Spain

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: DV FO JLS. Performed the experiments: DV. Analyzed the data: DV. Contributed reagents/materials/analysis tools: FO JLS. Contributed to the writing of the manuscript: DV FO JLS.