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Mostly gut feeling supported by the shape of the head and body and the narrow lateral band. If your fish show abdominal markings or horizontal caudal pattern or a downwards widened suborbital stripe as in the following picture, you can be 100% sure:
It's for sure a regani-group species, but the regani-group is quite large!
However, based on the distinct pale area between lateral band and caudal spot, it can likely be narrowed down to a regani-complex species. Unfortunately, I can't tell which one, especially if it's in fact from the Rio...
It was believed to be A. uaupesi before it's scientific description. A. uaupesi has several common names, see here. However, whether the above fish are in fact flabellicauda is impossible to tell without seeing the caudal pattern of the male and without knowing the catch location.
Females do show a very pronounced lateral spot when in spawning/brooding mood, but then it's easy to identify them as females anyway ;) Other than this, I'm not aware that females do show a lateral spot more often than males do.
What is the size of the first fish?
It can be A. cf. sp. D24 from Rio Manacacias but it can also be A. sp. Manacacias. Let it color up fully and then show some more pictures if possible in different moods.
Your "agassizii Tefe" male is either A. sp. Tefe or one of the A. sp. aff. agassizii (Netz/net) forms, better pictures are needed to be sure. Your mystery fish is a male A. trifasciata.
They look like A. sp. Kiemenfleck/Gill-spot (D37). There are two known locations of them in the Rio Vaupes. This is the only reason I see why someone might come up with the crazy idea to call them "A. uaupesi".
"Rotkeil" is just one of the a common names of A. uaupesi.
Here are pictures (by Miguel) of A. cf. uaupesi that are said to be from Rio Jufari:
They shown a different caudal pattern than the typical A. uaupesi is supposed to do.
Your male can be Ladislao or Ladislao II or Ladislao III - which one I can't tell for sure without knowing the catch location. Whether the female is the same species I can't tell for sure either. But if they are from the same import or breeder, I wouldn't worry too much.