I'd say port also, nice big one too. I believe the scientific name is Aequidens portalgeirensis, or at least it was 20 years ago. I also haven't seen them for sale in awhile. It seems once the terrors became really popular I didn't see any of the other Aequidens species (ports, blue acaras, keyholes) for sale much at all.
Definitely a port cichlid. For years the scientific name was Aequidens portalegrensis, named after the Brazilian city of Porto Alegre, but fishbase now has the species listed as Cichlasoma portalegrense. BTW, I didn't know ports got that big. Usually, 6 inches TL is listed as the max size.