Original description:
- Greenwood, Peter Humphry. 1980. "Towards a phyletic classification of the 'genus' Haplochromis (Pisces, Cichlidae) and related taxa. Part II; the species from lakes Victoria, Nabugabo, Edward, George and Kivu". Bulletin of the British Museum (Natural History) Zoology Series. 39(1):1-101 (crc00319) (abstract)
Type species: Haplochromis parorthostoma Greenwood, 1967 (original designation).
Described species included (3):
valid: 3- Haplochromis orthostoma Regan, 1922 (valid)
- Haplochromis parorthostoma Greenwood, 1967 (valid)
- Pyxichromis paradoxus Lippitsch & Kaufman, 2003 (valid)
Potentially undescribed species (2):
- sp. 'gold large mouth' (undescribed)
- sp. 'orthostoma yellow' (undescribed)