According to the AviList checklist v2025 (link), the taxon is represented by six species in two genera in the family Coliidae, confined to sub-Saharan Africa. 

Traditional genus-level classification of extant Coliiformes, following AviList checklist v2025. (link) The number of subspecies is given in parentheses. 

References

Ksepka DT, and Clarke JA (2010), New fossil mousebird (Aves: Coliiformes) with feather preservation provides insight into the ecological diversity of an Eocene North American avifauna. Zool. J. Linn. Soc. 160, 685-706. (abstract)

Zelenkov NV, and Dyke GJ (2008), The fossil record and evolution of mousebirds (Aves: Coliiformes), Palaeontology 51, 1403-1418. (pdf)