Well, the Port, Cichlasoma portalegrense, and all the Laetacaras were once in the same genus, Aequidens, and are all still considered 'acaras.' The Port has been shuffled back and forth between Cichlasoma and Aequidens for over a century, finally landing in Cichlasoma while the smaller acaras were split off into Laetacara. And yes, a mature Port is very metallic green. In life even more so.That critter looks very similar to my 3 year old wc female l. araguaiae in breeding dress; though the lateral line is a bit different and i guess they are a little smaller.
@Back in the fold: Yes, the quality of all 19 of the Innes editions is unparalleled. Quite sad that when the copyright expired that Metaframe produced an edition that was cheaper in every way, though they at least preserved the text. Axelrod then made things worse by producing his own cheap edition which tampered with the text and replaced many of the images, mostly with his own of course. Another example of Axelrod's Innes-envy, which was pathological.