User blog comment:Plexioth- xD/Monster Hunter 3 Ultimate/@comment-68.49.124.68-20130204051221/@comment-4969421-20130206110410

The fact they are related to each other does not mean they're the same. Plesioth and Lavasioth are related to each other. Does that mean Plessy can swim in lava? Nope. The monsters you just mentioned don't make sense either. (except Deviljho, tbh) What then? Someone may have released such monsters in the island. That, or Capcom's lazyness.