Is that Betta dennisyongi or another one?
It's sad to think with all the habitat destruction going on some species may have gone extinct without anyone even knowing.
This is my Betta sp. apiapi. Apparently smallest betta species with an adult size of an inch. It looks very similar to rutilans but without any iridescence on the body and the male has a spade shaped caudal.
Cost me $200 for the pair but worth every penny as they are so nice. I think I am the only one in Australia keeping them although the transhipper has ordered a couple more pairs in from the seller.