This means it is a species very similar to A. macmasteri proper, but isn't A. macmasteri. These are usually not described scientifically yet, so this is the closest you can get in Terms of ID. Unless you know the catch location, then this is added as well.A.cf.macmasteri
I have seen similar A. cf. macmasteri with the location label "Arauca". Arauca is a department of Colombia containig the Rio Tame. On the other hand, from Puerto Carreno I only know one macmasteri-subcomplex species, A. sp. D21. And I have never seen any sepcimens of these with such intense red markings on the gill covers. So my guess would be that your fish are from Arauca/Tame.Thanks, MacZ
The seller said he made two orders of A.Macmasteri. One is from Tame and the other is from Puerto Carreño.
Yes it might also be an exceptionally colorful specimen of D33 but the latters catch location is not inside Arauca and more than100km away from Tame and the Rio Tame with at least two other rivers in between.Doesn’t it look like d33 (-apart from the length of the dorsal anal fins)? -not sure where in Columbia it’s from, though.
Check tomC’s site.