In LFSs there are a number of species sold as Texas cichlids.
Herichthys cyanoguttatus, and carpintus are the two most common, but because they are often confused, hybrids between the two are quite common.
There are also line bred specimens known as "Red" Texas.
Below is Herichthys carpintus (location point Chairel)
above is a male, directly below a female in breeding color
They can get quite large, and will eventually need a spacious tank (100 gallons or more).
Below is H tamasopoensus, which can at times be mistaken for a
I do think the term "Texas" cichlid in many cases is a misnomer, because only H cyanoguttatus is a true Texas, all the others, carpintus, tamasopoensis etc etc are "not" texas cichlids, and don't come from Texas, but many miles south, in Mexico. The term is used by lay people, stores who can't (or won't) or are too lazy to use the proper nomenclature because they look similar.
All the Herichthys are a fairly aggressive species, but most of the time, this has more to do with tank size, than actual aggressiveness. If the tank is large enough they are not that problematic, but if you try to cram more than 2 half grown individuals in a tank as small or 75 gallons or less, they can be killers.