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Sometimes the trade names fishes after the export stations from which they came. So if the fish were collected by a Brazilian fischermen who brought them to Santa Isabel, this could be a possible explanation, however not a very likely one imo.
A. sp. Breitbinden is the same species as A. piaroa. "Breitbinden" is just the common name of the species that was in use before it had been scientifically described as A. piaroa.
If you mean a large black blotch on the caudal peduncle, this is only seen in A165:
A164 can show a black blotch on the caudal peduncle too, but it is usually smaller, less pronounced and restricted to the area below the lateral band.
After looking at the pictures again, I think it's actually an eunotus-subcomplex species closely related (or identical) to A. sp. Nadelstreifen. Like these fish, A. sp. Nadelstreifen often show prominent vertical bars, but rarely (if ever?) split bars. Caudal spot and coloration of the caudal...
I agree with you Mike that it's likely a regani-complex species, but apart from that, I see no particular similarity to A. paulmuelleri at all. If these fish are in fact frrom Peru, I think that it's an entirely new species. @apistonoob99 do you have any information on the exact catch location?