One other thing....when you pick up a fish under a common name, like convict, Texas, or red devil, it in most cases it means just that, common aquarium strain, possible hybrid (perhaps intragenus hybrid).
Any serious cichlidophile would not use the term convict when they have Amatitlania kanna or siquia, they would want you to know its importance as a pure species.
Just as Amphilophus xiloaensus or zaliosus would be used instead of the common term red devil if that cichlidophile knew for sure.
Or in the most common oxymoron, Texas cichlid, when talking about Herichthys carpintus (and its location variants) or other species like tamasoepoensus.
Below carpintus

below tamasoepoensus

Just because they look similar doesn't mean they are the same.
This goes for old world too, if you buy a starry night cichlid, it could be any of a half dozen Paratilapia species.
P polleni below

now P sp. Andapa
,

similar yes, the same, nope!