(Two subspecies of tuatara are at this time acknowledged. They have been previously considered to get separate species, so you could browse elsewhere that there are two species of tuatara). A reptile either has 4 legs, or is descended from animals with 4 legs. Even snakes have 4-legged ancestors. (The https://reptiles-and-amphibians-b79738.digitollblog.com/33263715/5-tips-about-reptiles-with-scales-you-can-use-today