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sp. "Rotkeil" is just a synonyme for this species, because of polychomatism.
But the colormorph on your pictures is not "Rotkeil".
Look at the tail colouration of "Rotkeil" (="red wedge"?):
Your fish is the "Blutkehl" (blood throat) colormorph of A. uaupesi.
But there is a similar, but different species from Orinoco/Atabapo, called A. sp. Blutkehl". Don't confuse that.
A. sp. "Blutkehl" ist closer related to A. iniridae, because of the dark lateral markings like A. iniridae, but has a caudal fin with filaments like A. uaupesi.