Paleontologists discover oldest known fossils of Ninjatitan dinosaur in Argentina, confirming a theory that the Titanosaurs may have evolved first in what is now South America.
From Sci-News:
Paleontologists Discover Oldest Known Titanosaur
Ninjatitan zapatai lived approximately 140 million years ago (Early Cretaceous epoch) in what is now Patagonia, Argentina.
Ninjatitan zapatai belongs to Titanosauria, a diverse group of sauropod (long-necked plant-eating) dinosaurs.
This group includes species ranging from the largest known terrestrial vertebrates to ‘dwarfs’ no bigger than elephants.
“During evolutionary history, sauropods had different moments, different pulses of gigantism, which were not only related to the group of titanosaurs,” said Dr. Pablo Ariel Gallina, a paleontologist at the Fundación Azara in Maimonides University and CONICET.
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http://www.sci-news.com/paleontology/ninjatitan-zapatai-09400.html