The genus Serranochromis is defined and is deemed to have arisen along two radii
from the Haplochromis species-flock of the Zambezi and Angola. The status of the
names proposed by Castelnau is discussed. Eight species are recognized, three
of which are new. The new species inhabit respectively (i) the Lake Mweru basin (ii),
the Upemba basin and upper Kasai system and (iii) R. Malagarazi. The last is a
striking example of the relation between the fish-faunas of the Malagarazi and the
upper Congo, Serranochromis being unknown in L. Tanganyika, which intervenes.
The population of S. robustus isolated in L. Nyasa and the Upper Shire is
recognized as subspecifically differentiated from the species in the rest of its
range. The latter takes the name S. robustus jallae (Boulenger).