Two species belonging to the Amphilophus citrinellus (Günther, 1864) species complex endemic to Lake Apoyo, Nicaragua are described. Both species exhibit unique phenotypic characters that have not been found in other members of the species complex. Furthermore, they breed assortatively in Lake Apoyo and can readily be distinguished in the field from all other described species found in that lake. Including the two herein described species, six species that form a monophyletic species assemblage within the Midas cichlid complex inhabit Lake Apoyo, Nicaragua.
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Vol. 123 • No. 2