Snailsus, before you think it, have some different qualities compared to the normal snails. They aren't just copycats with visors.
First, the goo snails produce when they move is non-existant on the Snailsus. Second, Snailsuses are actually quite fast (almost 10km/h which is a lot in comparison). They also have way more saturated colors than their counterparts. But, by far, the both weirdest and scariest property of the Snailsus is their maw. These creatures are able to bite and infect their preys with a corrosive acid located in their teeth, doing a fast yet painful death to their preys, and a short yet almost agonizing pain to bigger creatures like the Foxus.
These creatures don't hesitate at all to bite all in their sight, even if that means killing others of their own kind for food, territory or even just SHEER EVIL.