User blog comment:BannedLagiacrus/Monster Appreciation Week: Great Jagras/@comment-26421638-20180203144756/@comment-26034899-20180204000238

Fanged Wyverns are described as Fanged Beast-like Wyverns with highly developed limbs, and all the newcomers display these traits to various extents, so they fit into that class better than they would with other classes like Leviathans. Unlike the Leviathans, who generally have less developed limbs, specialize in swimming or burrowing, and slither around on their bellies, Jagras and the other Fanged Wyverns are better adapted to a terrestrial way of life, don't specialize in swimming or burrowing, and have a more mammalian gait, using a wide stride to get around while having more developed limbs (Dodogama is only an exception due to how fat it is; if it were thinner, it would have the same walk cycle as the others), so the newcomers still have Fanged Beast-like characteristics despite being more reptilian than Zinogre. And having snake-like traits doesn't automatically guarantee that a monster will be a Snake Wyvern, Remobra retcon aside, seeing how Mizutsune is still listed as a Leviathan despite having a snake-like head (and at the same time, it's also not listed as a Fanged Wyvern despite having fur and being more adapted to life on land, since it still has predominantly Leviathan-like traits like slithering around and having smaller limbs, so those traits alone don't make a Fanged Wyvern, it seems). So unless Capcom decides to make a class involving terrestrial lizards that aren't essentially scaly mammals like Zinogre and Odogaron, their current classification seems like the best option, at least to me.