J.F. Bonaparte’s scientific contributions

... Supporting the possibility of such a migratory scenario, other groups of terrestrial vertebrates appear to have reached South America from Laurasia, North America in particular, during the Campanian -Maastrichtian interval (Bonaparte 1986). Among those recently advanced as such are the nodosaurine ankylosaur Patagopelta (Riguetti et al. 2022;however, Agnolín, Rozadilla et al. 2023 considered it as a Gondwanan parankylosaurian) and hadrosaurs (Alarcón-Muñoz et al. 2023;Bonaparte 1996;Prieto-Márquez 2010; though this was put into question by Rozadilla et al. 2021). Most of the hadrosaurs from the Upper Cretaceous of South America have been recovered as a monophyletic group Alarcón-Muñoz et al. 2023), which raises the possibility that the radiation of hadrosaurs in Patagonia involves a substantial amount of time to result in the observed endemic diversity. ...

Reference:

A Late Cretaceous lizard assemblage from the Allen Formation, northern Patagonia, Argentina