Leviathan

Leviathans (Japanese 海竜種) are a class of monsters first appearing in the third generation. This class is mainly comprised of serpentine creatures with long, slender bodies and paddle-like tails. Unlike most other monsters, many Leviathans are accustomed to aquatic life, and in fact are often apex predators in their underwater habitats. Those that are aquatic can be found on land as well, but are much better suited to life under the sea. However, some Leviathans are uniquely adapted for terrestrial life, many capable of digging and burrowing to surprise prey from below. Leviathans can be found in a wide variety of habitats, ranging from oceans and deserts to volcanoes and frozen tundras.

Fourth Generation Leviathans
None / Unconfirmed.

Monster Hunter Online Leviathans
None / Unconfirmed.