But Phuthi is genetically—along with Zulu, Hlubi, Xhosa, northern and southern Ndebele, and Swati—certainly a Nguni language. Thus, it should be numbered in the S.40 group within Zone S, following Guthrie's classification. Further, given the range of lexical, phonological and even low-level phonetic effects that appear to be shared almost exclusively with Swati, Phuthi can be classified uncontroversially as a Tekela Nguni language, that is, in the subset of Nguni that includes Swati, some versions of Southern Ndebele, and the Eastern Cape remnant languages, Bhaca and Hlubi.