Protomelas dejunctus, new species, is described from Chinyankwazi and Chinyamwezi
islands, located in the southeast arm of Lake Malawi. The new species is morphologically
similar to P. fenestratus and P. taeniolatus, but sheared principal component
analysis of the morphometric data and principal component analysis of the meristic data
clearly separate these species. The new species can be distinguished from P.
fenestratus and P. taeniolatus by the greater number of gill rakers on the first
gill [sic], its greater head depth, the intense blue coloration of breeding males, and
the presence of tricuspid teeth in its outer row of the lower jaw.