Where skeletons are rare, isolated teeth can flesh out our understanding of ancient reptile-dominated ecosystems, according to a study published September 8, 2021 in the open-access journal PLoS ONE by Ariana Paulina-Carabajal of INIBIOMA (Instituto de Investigaciones en Biodiversidad y Medioambiente) and CONICET (Consejo Nacional de Investigaciones Científicas y Técnicas), Argentina, and colleagues.