User blog comment:B214/Volume 17 spoilers./@comment-24098614-20140318171834/@comment-1359322-20140319065746

Actually Akeno and the others are viewed as Reincarnated Devil not their former species anymore, they are considered as "Reincarnated Devil from their previous species". As to Ophis, as a species, it is a Dragon that has the ability of God(s) (to give blessings), thus Ophis is known as the Dragon God.