User blog comment:Mckrongs/Lagiacrus Subspecies Discussion/@comment-173.65.162.32-20110919013325

Since they got rid of swimming in monster hunter, largiacrus has lost a lot of its most powerful attacks. I believe this subspecies of largiacrus must be more acustomed to fighting on land rather than in the water (since its easy to pwn a normal largicrus while its on land).

Since Largiacrus' color grows lighter as he stays on land, this largiacrus must stay on land more than going in the water. If this is true that would mean this subspecies is probably moves faster on land. The extra spikes must be a form of protection against other wyverns like Rathalos (although it is hard to tell from this one screenshot).