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As others have mentioned, the classification on the identification page is correct, however... there are more variants that can be added. It is true that some of these fish appear to be (or should be) a valid specie, but they have not officially been identified and categorized by any taxonomist. This is why Kullander said "There may be more species..." It is also why you see such classifications as
[LIST]
[*]Pterophyllum Scalare (Eimekei)
Pterophyllum Scalare ([COLOR=black]Peruvian[/COLOR])
Pterophyllum Scalare (Red Shoulder)
[/LIST]