Not to be all know it all and stuff, but wouldn't it be
Tyranni Scrabanicus, since the first name stands for the genus?
Now onto the rest of your post, BM. I think that a Paramite might have to sneak up onto a Mug in order to kill it. Mugs seem like that they retract their teeth to give sort of a painful whip kind of attack. However, I might see how Paramitess would be able to knock down the Meech and attack it from the bottom. I mean, if they were in a big pack, they could sneak up and knock down the Mug down before it could react fast enough.
I do see the sense in your post. If we compared Meeches to raptors, they would be able to sprint onto animals like Mudokons or Elum. They could also give off quite a chase, being that probably have great jumping abilities.
Now to Ziggy. I think Mudokons being given teeth was all part of the time rescriction thing. It doesn't really make sense, since their skulls don't seem to have any signs of teeth. However, it could show that Mudokons have the ability to chew objects like Meech Munchies and Scrab Cakes. Other than that, I don't really know.