I've actually talked at length with Dr. John Lundberg on this. He is certain that perruno is a separate species. However they are geographically isolated. If I remember correctly they belong to one body of water and that's all. At least as far as we know. If I manage to dig through our hundreds of emails perhaps I'll get his exact qoute for you.
Think you were a little high on the dorsal fin ray count in both cases but excellent memory in the differences.Again I would have to refresh my memory but I believe perruno has 10-11 rays dorsally while marmoratus has 12-14. I could totally be wrong because I'm pushing my memory back like 10 years
Unless a marmoratus looking fish has only 8 or 9 spines (rays) to its dorsal fin, nowadays best to call it marmoratus as they outnumber sightings by at a guess 100,000:1 or more.Thanks for your info. But still confused about it. I may be stupid haha but i can simply call it marmoratus then?