unit (related to the tasselled group) all inhabiting Lake Malawi; S. andersonii
and S. macrochir in the upper Zambezi, Kafue and Okovango basins related
respectively to S. mossambicus and the tasselled group.
That the sarotherodons have not formed such huge species flocks as have
the haplochromine and other cichlids of the Great Lakes I put down to the
fact that as colonizers they were already highly specialized for feeding on
minute epiphytic and planktonic algae and had few or no rivals in that field.
That they diversified at all within these limits is a matter for wonder.Figure 1. Natural distribution of the subgenus Sarotherodon of genus Sarotherodon. S.
galilaeus, )(II other species except the brackish water S. melanotheron. (Trewavas, in
press)