[1] Atlantic–Congo (roughly, Niger–Congo but excluding the Mande, Kru, Siamou, Kordofanian, Dogon and Ijoid languages) is accepted by Glottolog 4.4.
Larry Hyman (2016) reconstructs two contrastive level tones for Proto-Niger–Congo, which are:[4][5] Proto-Niger–Congo is traditionally assumed to have had a disyllabic root structure similar to that of Proto-Bantu, namely (C)V-CVCV[6] (Williamson 2000,[7] etc.).
Noun class prefixes in Proto-Atlantic–Congo include:[1] Below are some Niger–Congo noun class markers (Good 2020:145,[9] from Schadeberg 1989:72[10]): Below are some Proto-Niger/Atlantic–Congo, Proto-Bantu, and Proto-Atlantic verbal extensions (Good 2020:146,[9] from Hyman 2007:157[11]): For example, in Swahili: Güldemann's (2018) Proto-Niger–Congo pronoun reconstructions, for the first and second person pronouns (singular and plural), are given below.
Nevertheless, quasi-reconstructions (preliminary, tentative reconstructions, which are marked using the number sign #) have been attempted by Roger Blench, who is currently compiling a Niger–Congo etymological dictionary.
Some examples from Blench (2016):[6] Hans Günther Mukarovsky [de]'s reconstruction of Proto-Western Nigritic (roughly equivalent to Proto-Atlantic–Congo[14]) was published in 2 volumes in 1976 and 1977.