First monotreme from the Late Cretaceous of South America

Affiliations

Nicolás R. Chimento: Laboratorio de Anatomía Comparada y Evolución de los Vertebrados, Museo Argentino de Ciencias Naturales “Bernardino Rivadavia” (CONICET); Av. Ángel Gallardo 470
Federico L. Agnolín: Laboratorio de Anatomía Comparada y Evolución de los Vertebrados, Museo Argentino de Ciencias Naturales “Bernardino Rivadavia” (CONICET); Av. Ángel Gallardo 470
Makoto Manabe: National Museum of Nature and Science
Takanobu Tsuihiji: National Museum of Nature and Science
Thomas H. Rich: Museums Victoria; P. O. Box 666
Patricia Vickers-Rich: School of Earth, Atmosphere and Environment, Monash University, Clayton, Victoria 3800 and Department of Chemistry and Biotechnology, Swinburne University
Fernando E. Novas: Laboratorio de Anatomía Comparada y Evolución de los Vertebrados, Museo Argentino de Ciencias Naturales “Bernardino Rivadavia” (CONICET); Av. Ángel Gallardo 470

Abstract

An isolated tooth from the Late Cretaceous of Argentina indicates a monotreme presence in South America by the end of the Mesozoic.