Not only that but the animations and everything about it (including that your fighting them in an arena in a hunting/ gladitorial competition) bear close resemblance to what we have in the STO episode of "Coliseum".
Um, no... worms have always been in the Guild Wars games. The small ones are "worms" and the giant ones are "wurms." GW2 is upping the visuals and animations, but they always looked and acted just like that, years before STO was made.
And they look remarkablly like the "worms" in Hellfire Peninsula in WoW.
There is very little you will not be able to find in other games if you look hard enough. There is very little that can be original about a worm, a human, an orc and so on and so forth. It is well known the industry tends to borrow from each other.