Gold saums are rivulatus. Also, somehow 'original green terror' has gotten mixed up for a lot of people and it's not what they think. IMO the confusion comes from questions among experts before recent years over which was the true
rivulatus, the original fish being described in 1860. In some older books and articles what is pictured as the true rivulatus is what is now stalsbergi, a rare fish in the hobby before recently, and gold saums were thought to likely be a another fish. From this some got the idea stalsbergi were the original
green terror and this has proliferated on forums. BUT-- it turns out gold saums are rivulatus, hence a morph of the fish originally described in 1860, and stalsbergi are another fish-- so on this score stalsbergi is not the original green terror.
Hobby-wise, gold saums entered the hobby in the 1970s, what is now stalsbergi (what some
thought was true rivulatus) was only known in a few photographs at the time. A 1982 German article called what is now stalsbergi "The Green Terror that Isn't", in other words a false green terror, opposite the notion most people now have. In reality, true and false green terror or original green terror is kind of a moot point, but if you wanted to get technical over the history in the hobby, gold and white edged rivulatus would be the original fish called green terrors when they entered the hobby-- so, on this score stalsbergi are not the original green terrors.
Rivulatus are fish from Ecuador, whether gold edged or white edged, Stalsbergi are from Peru. It can be confusing, got into a big forum argument once because while I had it right in my head I didn't explain it well and then I used a confusing article as my reference, so they seemed to think I was saying the white edged rivulatus was stalsbergi. If you want to read an expert's account of the history for yourself, this is now my go to
article.