User blog comment:Kogath/Monster Hunter X Discussion/@comment-25083735-20150710192336/@comment-5853890-20150710235355

Correct if I'm wrong about Akantor and Ulk, but I believe that they were considered Elder Dragons before the discovery of Tigrex and were reclassified Flying Wyvern because of the similar build an remants of what could be devolved wings.

As for bubbles, I don't see any biological similarities between him and Fanged Wyverns. He still share traits to be a Leviathan: slender, webbed/whatever feet, snout?, etc.

Khezu not baring any similarity to Flying Wyvern? I'm surprise that you didn't say Tiggy instead.