OK - so ALL of these fish are seen in some locations or other...
Except one...
Has ANYBODY? seen swordtail characins/tetras (Corynopoma riisei) anywhere in the past 20 years?
I had one, as one of my very first fish, and have not seen a single other one since. That was about 20 years ago. (And I don't even know if they are golden in nature, because mine was gold.)
I'd love to get some to refresh that memory. He lived for a good 6 years or so.