The Dogon languages are a small closely-related language family that is spoken by the Dogon people of Mali and may belong to the proposed Niger–Congo family. There are about 600,000 speakers of its dozen languages. They are tonal languages, and most, like Dogul, have two tones, but some, like Donno So, have three. Their basic word order is subject–object–verb. External relationships The evidence linking Dogon to the Niger–Congo family is weak, and their place within the family, assuming they do belong, is not clear. Various theories have been proposed, placing them in Gur, Mande, or as an independent branch, the last now being the preferred approach. The Dogon languages show no remnants of the noun class system characteristic of much of Niger–Congo, leading linguists to conclude that they likely diverged from Niger–Congo very early. Roger Blench comments, and: The Bamana and Fula languages have exerted significant influence on Dogon, due to their close cultural and geographical ties. Blench (2015) suggests that Bangime and Dogon languages may have a substratum from a "missing" branch of Nilo-Saharan that had split off relatively early from Proto-Nilo-Saharan, and tentatively calls that branch "Plateau". Internal classification The Dogon consider themselves a single ethnic group, but recognise that their languages are different. In Dogon cosmology, Dogon constitutes six of the twelve languages of the world (the others being Fulfulde, Mooré, Bambara, Bozo and Tamasheq). Jamsay is thought to be the original Dogon language, but the Dogon "recognise a myriad of tiny distinctions even between parts of villages and sometimes individuals, and strive to preserve these" (Hochstetler 2004:18). The best-studied Dogon language is the escarpment language Toro So (Tɔrɔ sɔɔ) of Sanga, due to Marcel Griaule's studies there and because Toro So was selected as one of thirteen national languages of Mali. It is mutually intelligible with other escarpment varieties. However, the plains languages—Tene Ka, Tomo Ka, and Jamsay, which are not intelligible with Toro so—have more speakers, and Jamsay and Tommo so are most conservative linguistically. Calame-Griaule (1956) Calame-Griaule appears to have been the first to work out the various varieties of Dogon. Calame-Griaule (1956) classified the languages as follows, with accommodation given for languages which have since been discovered (new Dogon languages were reported as late as 2005), or have since been shown to be mutually intelligible (as Hochstetler confirmed for the escarpment dialects). The two standard languages are asterisked. Plains Dogon: Jamsai,* Tɔrɔ tegu,