I see what you're saying. I'm almost wondering if when these fish were first named they were actually just all subspecies or species within the same genus. There are marked differences just within the species longibarbis. Seems it needs much, much more research. Going to try and get hold of a silurologist that I know, and see what he has to say about it. I also found a museum that claims to have the first collected specimen of perruno in it's collection. Going to see if they can photograph it and send me pics.
I'm basing my count on several different sources since they all vary. 8-10 for perruno, and 12-14 for longibarbis. If the experts cant agree how can we? lol. Let's ask for a recount.