Boa constrictor
Kluge (1991) moved the genera "Sanzinia" and "Acrantophis" into "Boa", based on a phylogeny derived from morphological characters. However, it has since been shown that the Malagasy boids and "Boa constrictor" do not form a monophyletic group, and the lumping of "Sanzinia", "Acrantophis" and "Boa" was, therefore, an error. These snakes are therefore correctly represented in their own genera: "Sanzinia" and "Acrantophis".