The Amazon River, a body of water that runs down the eastern side of the Andes Mountains, through the widest part of South America, and into the Pacific Ocean, is a vast and energy-rich habitat, fully capable of supporting a diversity of large herbivores.  By far the most common of these aquatic and semi-aquatic grazers are the Amazon river nodopotami.

    The Amazon river nodopotamus (Bryodorsus amazoniensis) is a part of the small clade Nodopotamidae a group of semi-aquatic herbivores rather like the potamoceratopids of Asia.  This clade evolved in North America during the end of the Eocene, but had since spread into South America.  For a nodopotamine, the Amazon species is rather small (80-100kg), and exists in far greater numbers than the much larger herbivore, the aquatitan.  Like the aquatitan, the Amazon river nodopotamus is the home for a number of symbiotes, both internal and external, parasitic and beneficial.  However, most of the biological diversity dependent upon a nodopotamus is on its back, in the form of a lush growth of algae and moss that grows on the herbivore's dorsal armor.