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The visual system of vertebrates has greatly contributed to our understanding of how different molecular mechanisms shape adaptive phenotypic diversity. Extensive work on African cichlid fishes has shown how variation in opsin gene expression mediates diversification as well as convergent evolution in colour vision. This trait has received less attention in Neotropical cichlids, the sister lineage to African cichlids, but the work done so far led to the conclusion that colour vision is much less variable in Neotropical species. However,