User blog comment:Lord Loss/Monster Hunter Theory... Blog/@comment-7584137-20140825113054/@comment-8985329-20140831142544

Mmmm... I think "agnancestors" lived in the ocean and then they adapted  first  to volcanic zones becoming actual Agnaktors, and a recent change in their environment (Probably the appearance of a new predator (Brachydios),  source of food disappearance/migration, etc.) made the weakest ones or Uroktors migrate through the ocean (they keep swimming abilities) to harsher areas like the tundra, where they adpated to the frozen climate (replacing lava and fire to ice and water). And that explains why there are no "Ice Uroktors", because they live in the frozen waters until they grow and become Glacial Agnaktors; and why is this sub so recent (there would be.a similar explanation to Sand Barioth because Brachydios also appears in the Tundra)