Although Pseudotropheus elongatus was originally described from Mbamba Bay,
Tanzania, a species of the P. elongatus-complex from Nkhata Bay, Malawi, has been
considered to be the typical P. elongatus. Collections from Mbamba Bay revealed
that at least two elongate Pseudotropheus species co-occur. The two extant syntypes
of P. elongatus belong to the two species from Mbamba Bay. The specimen pictured by
Fryer (1956) is selected as lectotype. The other species is described here as P. longior,
new species. A third elongate cichlid, frequent at Mbamba Bay, is Genyochromis mento;
some observations on this fish are included.