Original description:
- Regan, Charles Tate. 1922. "The Classification of the Fishes of the Family Cichlidae.--II. On African and Syrian Genera Not Restricted to the Great Lakes". Annals and Magazine of Natural History. 9(10), 252 (crc00107)
Type species: Chromis williamsi Günther, 1894 (original designation).
Described species included (20):
valid: 18 synonym: 2- Chromis williamsi Günther, 1894 (valid)
- Tilapia livingstonii Boulenger, 1899 (valid)
- Pseudotropheus novemfasciatus Regan, 1922 (valid)
- Pseudotropheus fuscus Trewavas, 1935 (valid)
- Pseudotropheus lucerna Trewavas, 1935 (valid)
- Melanochromis perspicax Trewavas, 1935 (valid)
- Pseudotropheus elegans Trewavas, 1935 (valid)
- Melanochromis brevis Trewavas, 1935 (valid)
- Pseudotropheus fuscoides Fryer, 1956 (synonym)
- Pseudotropheus johannii Eccles, 1973 (valid)
- Melanochromis interruptus Johnson, 1975 (valid)
- Pseudotropheus tursiops Burgess & Axelrod, 1975 (valid)
- Pseudotropheus purpuratus Johnson, 1976 (valid)
- Melanochromis crabro Ribbink & Lewis, 1982 (valid)
- Melanochromis cyaneorhabdos Bowers & Stauffer, 1997 (valid)
- Melanochromis perileucos Bowers & Stauffer, 1997 (valid)
- Melanochromis benetos Bowers & Stauffer, 1997 (valid)
- Melanochromis elastodema Bowers & Stauffer, 1997 (synonym)
- Pseudotropheus galanos Stauffer & Kellogg, 2002 (valid)
- Pseudotropheus likomae Konings, Miller & Stauffer, 2024 (valid)
Potentially undescribed species (34):
- sp. 'polit' (undescribed)
- sp. 'aggressive grey' (undescribed)
- sp. 'aggressive yellow fin' (undescribed)
- sp. 'crabro blue' (undescribed)
- sp. 'dwarf nkhata' (undescribed)
- sp. 'elongatus kirondo' (undescribed)
- sp. 'elongatus makonde' (undescribed)
- sp. 'kingsizei tumbi' (undescribed)
- sp. 'minutus tanzania' (undescribed)
- sp. 'ndumbi gold' (undescribed)
- sp. 'perspicax hara' (undescribed)
- sp. 'perspicax likoma' (undescribed)
- sp. 'perspicax orange cap' (undescribed)
- sp. 'perspicax tanzania' (undescribed)
- sp. 'polit tumbi' (undescribed)
- sp. 'sand cobalt' (undescribed)
- sp. 'socolofi nkolongwe' (undescribed)
- sp. 'thin stripe' (undescribed)
- sp. 'three peaks' (undescribed)
- sp. 'tiny' (undescribed)
- sp. 'tursiops mbenji' (undescribed)
- sp. 'variable eastern' (undescribed)
- sp. 'variable kande' (undescribed)
- sp. 'variable mozambique' (undescribed)
- sp. 'williamsi makanjila' (undescribed)
- sp. 'williamsi maleri' (undescribed)
- sp. 'williamsi north' (undescribed)
- sp. 'acei' (undescribed)
- sp. 'lucerna blue cobalt' (undescribed)
- sp. 'lucerna blue mozambique' (undescribed)
- sp. 'lucerna blue tanzania' (undescribed)
- sp. 'lucerna brown' (undescribed)
- sp. 'lucerna fin spot' (undescribed)
- sp. 'lucerna north' (undescribed)