User blog comment:Lord Loss/Monster Hunter Theory... Blog/@comment-74.193.210.169-20120624024933/@comment-1758220-20120624161735

But even then why are raptorial bird wyverns considered wyverns at all? Shouldn't they just be called raptors? Then maybe the Brute Wyvern class would have been called Brute Raptors, which makes a lot more sense than calling them wyverns. As for Akantor, that makes sense except for the fact that 1) The game calls it a flying wyvern and 2) Ukanlos is void of any wing structures and is also considered a flying wyvern.

Piscines have the standard wyvern body structure (What a real wyvern is), i.e two legs, two wings, a tail and a head, no forelimbs. As such they have every right to be considered a wyvern, except Delex, who I think we'll just call a piscine monster, as it does have swimming characteristics but is not actually a wyvern. Now Lavasioth is interesting because it has no wings, but all of the other components. So unless you count his pectoral fins as small, stubby wings then I don't know if we could call him a wyvern either.