What did the existence of dramatic, localized specialization in *Amargasaurus* suggest about sauropod evolution during the Cretaceous?

Answer

Evolution favored specialization rather than only maximizing overall size

Its existence demonstrates that even within the generally successful sauropod blueprint, evolution favored dramatic, localized specialization rather than just maximizing overall size throughout the Cretaceous period.

What did the existence of dramatic, localized specialization in *Amargasaurus* suggest about sauropod evolution during the Cretaceous?
fossildinosaurspinesauropodAmargasaurus