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... but Ap. sp. "Xingú" (=same as Ap. sp. "Rio Xingú") is a completely different species, which builds with others an own species-complex (Xingú Ap.-complex - see Koslowski). e.g. the Ap. sp. "Vielfleck" is a close related and quite similar species to the Xingú-Apistogramma.
So this name should NOT be used for others, that's too confusing.
The Ap. sp. "Blauspiegel" is - as I said - a species, similar to Ap. gephyra and Ap. pulchra.