Originally Posted by mcaquatic
So you are referring to the common names which is not too helpful at all unfortunately. Is this fish baryancistrus or hemiancisteus is what I need to know.
Well you were so I figured that's how I should respond. The aquabid pic ARE Hemiancistrus subviridis. Compare how far the spotting goes back between Hemiancistrus subviridis & Baryancistrus demantoides to the aquabid sale.
However this guy has a bary with the correct spotting, but it's hard to see the olive green.
You can read about the differences there. But the short version is that the dorsal and adipose fin of Baryancistrus demantoides are connected by a membrane.