User blog comment:Lord Loss/Monster Hunter Theory... Blog/@comment-74.193.210.169-20120624160721/@comment-4212769-20120624163953

You're comparing two very different things. Caecilians are amphibians and no eathworms. But that would be easily seen when looking at the anatomy because as amphibians they have a skeleton. This was only a suspection based on the look.

And now explain to me (and use the answer button in the right corner. Making always new threads is quite annoying)... What could Plesioth be else?

You don't seem to see that they don't only look very similar. Plesioth has the same leg structure as other Flying Wyverns (Rathian). It has lungs. It has a similar behavior like Birdwyverns (You know... the run to the water to jump in). The conclusion is it has evolved from Wyverns and/or can be referred as Wyvern. This cannot be a coincidence.

Leviathans (In Japanese they're called Sea Wyvern) are much more unbelievably Wyverns.

You're right. Capcom just throws around with Wyvern classes but you have to see that not every Wyvern class/monster in a Wyvern class has to be wrong to be called a Wyvern.

The only Piscine Wyvern I wouldn't call a Wyvern is Delex... although it has a very reptilian design.