User blog comment:Lord Loss/Monster Hunter Theory... Blog/@comment-4674269-20120701220131/@comment-5333970-20120727153055

I would also say deevolved in this manner - I usually think of Wyvern to Puesdo Ancestory and de-evolution like this

Flying wyverna are capable of flight for long periods of time such as a Rathalos and sometimes even encoparate this theme into their type of fighting.

But a Tigrex, or Nargacuga which is still capable of flight but just not for huge distances, but mainly use there fighting techniques on land - which would hint puesdo-wyverns.

However strangely enough, Akantor and Ukanlos losing their wings may be related to them growning to massive proportions and perhaps this may relate to why they have lost their wings - or perhaps its just a case of that their body mass was too high their wings could not support them being capable of flight and so the wings, what would of been there, are now developed into highly specialised claws/scales which accentuates a different version of fighting technique on land, specific to that monster such as Ukanlos's Swim attack.

However, you could then say deevolvution went further to bring in the introduction of fanged wyverns who also seemed to have lost their wings for sharps claws and scales but instead of having reptilian qualities - have mammalian qualities.