User blog comment:Lord Loss/Monster Hunter Theory... Blog/@comment-3339774-20111220000609/@comment-1011548-20111220075043

I would suggest it's too different to any other kind of Rathian for that to be the case. Green, Pink and Gold are all similar enough to each other that it's plausible that they're different ages of the same species, but Frontier Rathian Sub has a whole host of others attacks the others don't (lazer beam, anyone?)...which kind of suggest it really is a Subspecies.