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Argentinian black and white tegus are sometime simply called black and white tegus, although this can lead to confusion as there is also a Columbian black and white tegu (the Columbian is similar but smaller and less docile). Sometimes they are also called giant tegus, or big headed tegus. The scientific name is Tupinambis merianae.
The Argentinian black and white tegu is largest of the tegus, and adults often reach a size of 4 feet or even longer (including the tail). They have a fairly distinctive pattern of white and black dots and stripes over the entire body.