Gur languages
The Gur languages, also known as Central Gur or Mabia, belong to the Niger–Congo languages. There are about 70 languages belonging to this group. They are spoken in the Sahelian and savanna regions of West Africa, namely: in most areas of Burkina Faso, and in south-central Mali, northeastern Ivory Coast, the northern halves of Ghana and Togo, northwestern Benin, and southwestern Niger. Additionally, a single Gur language, "Baatonum", is spoken in the extreme northwest of Nigeria. Typological features. Like most Niger–Congo languages, the ancestor of Gur languages probably had a noun class system; many of  today's languages have reduced this to a system of nominal genders or declensions or no longer have a class system. A common property of Gur languages is the verbal aspect marking. Almost all Gur languages are tonal, with Koromfé being a notable exception. The tonal systems of Gur languages are rather divergent. Most Gur languages have been described as following the model of a two tone downstep system, but the languages of Oti-Volta branch and some others have three phonemic tones. History of study. Sigismund Wilhelm Koelle first mentions twelve Gur languages in his 1854 "Polyglotta Africana", which  represent ten languages in modern classification. Notably, he correctly identified these languages as being related to one another; his 'North-Eastern High Sudan' corresponds to Gur in modern classification. The Gur family was previously called Voltaic, following the French name "(langues) Voltaïques" (named after the Volta River). It was once considered to be more extensive than it is often regarded today, including the Senufo languages and a number of small language isolates. The inclusion of Senufo within Gur has been rejected by many linguists, including Tony Naden. Williamson and Blench place Senufo as a separate branch of Atlantic–Congo, while  other non-Central Gur languages are placed somewhat closer as separate branches within the Savannas continuum. Kleinewillinghöfer (2014) notes that the closest relatives of Gur appear to be several branches of the obsolete Adamawa family, since many "Adamawa" languages in fact share more similarities with various (Central) Gur languages than with other Adamawa languages. He proposes that early Gur-Adamawa speakers had cultivated guinea corn and millet in a wooded savanna environment. Classification. The regions on the map denote regional distribution of the Central Gur languages. The tree-diagram below denotes the relations between these languages and their closest relatives : The position of Dogoso–Khe in Southern Gur is not clear; it is not closely related to other members of the branch. Bodomo (2017). Bodomo (2017) refers to the entire Central Gur group as "Mabia". The term "Mabia" is a portmanteau of the two lexical innovations "ma"- 'mother' + "bia" 'child'. The following is a classification of the Mabia (or Central Gur) languages from Bodomo (2017), as cited in Bodomo (2020). Bodomo divides Mabia into three primary branches, namely West, East, and Central. The term "Mabia", instead of "Gur", is also used by Naden (2021). Naden (2021) lists the languages  of the Southern/Eastern Mabia group as Dagbani, Hanga, Kantoosi, Kamara, Kusaal, Mampruli, Nabit, Nanun, and Talni. Comparative vocabulary. Sample basic vocabulary of Gur languages: "Note": In table cells with slashes, the singular form is given before the slash, while the plural form follows the slash. Numerals. Comparison of numerals in individual languages: