Am I correct that the most recent classification is Amatitlania myrnae. I recently picked up 6 two inch topaz that were listed as Criptoheros myrnae. Really neat little fish. Very pleased with these guys/gals.
Amatitlania myrnae species profile, with information about taxonomy, distribution, natural history, aquarium keeping, and conservation; including pictures, videos, and an extensive bibliography
As late as 2001 they were still in the genus Cryptoheros, but in 2016, Smitter Soto, put them into Amatitlania.
I have found them to be great parents, and the females will spawn as small as 2"
The male in the shot above was about 5" -6" TL.