User blog comment:Kogath/Monster Hunter X Discussion/@comment-25083735-20150710043522/@comment-5853890-20150710112800

As Chimera already said, nearly all Leviathans are long and slender with several exceptions but most share the some sort of "swimming" trait.

Bubbles are probably linked with water........this is kinda common sense.

If it has to be closely related to anything else, I'd say Snake Wyvern be the closest.