User blog comment:Mckrongs/Monster Hunter 4 for the Nintendo 3DS/@comment-4775842-20120803125321/@comment-4212769-20120803153919

And don't forget that "Primatius" comes from "primate" and surely was chosen because the first "real" Pelagus/Primatius monsters were apes and so fit in. But they changed it because the first Pelagus/Primatius Bullfango (IIRC it was a herbivore in first generation, am I right?) and later Bulldrome surely aren't primates and so they needed another designation.

So if they would ever change it (what I highly doubt) they would bring as Primatius Conga(lala), Blango(nga), Rajang (, Gogomoa) and Kechawacha. The rest would be Pelagus. But like I said I highly doubt it and it lacks completely of necessity.

And like the anon said, the Fanged Wyvern shall fill that position. At least by speculation.