In 2014, the population in the Araguaia-Tocantins basin was recognized to be an additional species, Inia araguaiaensis.
In 1847, he and Paul Gervais compared it to "Delphinius geoffrensis" (=Amazon river dolphin, Inia geoffrensis), which had been described from a stuffed specimen in Lisbon, and the two were considered synonyms for more than a century.
The Amazon river dolphin (Inia geoffrensis) that live in the river systems of Brazil, Bolivia, Peru, Ecuador, Colombia and Venezuela.