Sorry verse, they're reclassifying all of the Heros genus so some german guys went back to the original site where the Heros severum holotype was caught - it wasn't the fish in the trade called a severum, and the fish was a mouthbrooder!
The fish now called a severum is believed to be Heros efasciatus, also called H. appendiculatus.
I don't know many Heros species there are but I know there are some real impressive ones going into the US at the moment