Abstract
The Guiana dolphin Sotalia guianensis (Van Bénéden, 1864) is one of the Sotalia genus species to inhabit the estuarine-coastal regions of South America, including the Amazon river system (Da Silva & Best, 1996). The effective separation between the species of the genus is relatively recent and occurred via morphology (Borobia, 1989), three-dimensional geometric morphometry (Montero-Filho …