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You are right, the ones that look different are a macmasteri-subcomplex species. It can be A. macmasteri (Rotrücken/Red Shoulder) but without knowing the exact catch location it's not possible to be 100% sure because in recent years this subcomplex has become a minefield ID-wise.
Your fish look still like a hoignei-related species to me. Especially in the photo were the male is displaying in front of the mirror. It's a pitty that it can't be seen in full side-view in doing so.
You are right, the two females in the first photo are A. nijsseni. Whether the fish in the second photo is a male nijsseni I can't tell for sure. Please post some better/clearer photos.
Try to take some pictures of the male when displaying or in aggressive mood too. For this you can put a small mirror into the tank, take some photos and then remove the mirror from the tank.
No, it's not A. regani. Among other things the latter shows pronounced vertical stripes in the complete caudal fin, a different caudal spot and often pronounced vertical bars on the body. You may refer to the pictures published on the Aquarium Glaser website under the name A. regani, i.e...
Unfortunately, I still can't tell you the exact species and probably won't be able to without knowing the exact catch location. However, I can ID the fish in the background of the second picture, it's A. steindachneri.
Despite the split in vertical bar 6 I'm sure that it's not an eunotus-subcomplex species. Rather it looks like a hoignei-subcomplex species to me. I also have seen such splits in specimens from this subcomplex. To tell which exact species it is will probably not be possible without knowing the...
It's not megaptera because males of this species have at most the first 6 membranes of the dorsal fin strongly elongated whereas the rest isn't and is almost of equal length (see here). Depending on the catch location and on the size of the black blotch on the caudal peduncle it's either A...
I have no idea why part of the trade/some breeders misuse the name "agassizii Alenquer" for the linebred strain also known as A. agassizii "Alemare red tail" or "blue neon". However, the true "Alenquer" is A. sp. aff. agassizii (Alenquer) A 235, a wild species belonging to the...
You are right they don't look like D24. What exactly they are, is almost impossible to tell without knowing the catch location. Some possibilities are A. macmasteri, A. cf. macmasteri (Tame) or A. sp. D33.
What is called "A. agassizii" is in fact a group of very similar but genetically different species. Given the large distribution of A. agassizii, new research by Estivals et al. suggests that this group might easily consist of hundreds of different species! As a rule of thumb we can assume that...