Abstract This paper addresses one of the open issues in reconstruction Proto-Tupi-Guarani (PTG) segmental phonology: The status *k -*kʲ opposition. We argue that contrast is artifactual and presumed evidence favor PTG *kʲ can be considered as secondary developments Kayabí, Guarayu, Kagwahiva, Tenetehára, Kamayurá, Ka’apor. establish additional facts regarding structure historical phonology TG l...