[Mojo]

I agree with Alcar.

I believe Scrabania and Paramonia are the native lands of Scrabs and Paramites.
The Mudokon races which worshipped these creatures (probably Mudanchee and Mudomo), built the Scrabanian Temple and the Paramonian Temple to honor their totems. One of the things they did to honor them, was to protect them from Glukkons and the like. Also, because of the major enslavement of the Mudokon race, the Temples became abandoned. That's when the Scrabs and Paramites "inherited" the Temples, and made them to be their breeding grounds (hence the many nests that can be seen in both Temples). In exchange, the Scrabs and Paramites protected the last resting place of the Mudokon warriors from the caste that worshipped them.

Now, as for the appearance of Paramites and Scrabs in MO, I believe the particular areas aren't wilderness. In the level with the Scrabs, there Mudokon Scrubs. Believe me, those aren't in the wilderness (They are imprisoned in some sort of cage). In fact, there's a Brewery to Be (Hence the name of the level).
In the level with Paramites, a Bunker can be seen, what indicates that it isn't wilderness either.

Just my 2 cents though...