Amphilophus zaliosus is a species of cichlid that inhabits Lake Apoyo in Nicaragua. It is known in the aquarium trade as the arrow cichlid. It is an elongate species in the Midas cichlid species complex. The arrow cichlid shares its habitat with five other recently discovered species of this complex. Genetic evidence from Apoyo supports a hypothesis that the six known species of the lake evolved via sympatric speciation.