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Both are commercial names. "A. sp. Diamante" is A. eremnopyge. Never heard of the name "A. sp. Hawaii" before. I tried to upload the pdf again, but for some reason I can't.
A. sp. "Haway" is a commercial name on a form of Apistogramma bitaeniata with just a little or no cross-bands in the caudal fin. I've never found out where the fishermen collect them...
Interesting fish, Tom. It's very deep-bodied/high backed for the typical A. bitaeniata - and it looks almost like it has a caudal spot! Were your fish always so robust?
Yes, they have quite interesting features. I'm not entirely comfortable with regarding them as a variation of the same species as the very slender Brazilian forms. (And the reason they are, is the existence of the "intermediate" form from the Rio Tefé).
About 12 years ago, a form of A. bitaeniata was shipped to Japan that had a caudal with no pattern. It was from the middle Río Putumayo. Unlike Tom's fish, this Putumayo form shows the typical broad lateral band that extends into the caudal fin, not the virtual caudal spot seen on the Haway form.