Florentino Ameghino
Florentino Ameghino was an Argentine naturalist, paleontologist, anthropologist and zoologist, whose fossil discoveries on the Argentine Pampas, especially on Patagonia, rank with those made in the western United States during the late 19th century. Along with his two brothers Carlos and Juan Florentino Ameghino was one of the most important founding figures in South American paleontology.
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Source: Wikipedia