What about vermin that are created by
combining different types of vermin..?

Such as the arachyura
- A crab like spider? (Descent)
http://descent2e.wikia.com/wiki/Arachyura

Or the bane spider that spits poison.

Or a lava beetle :)

I wonder if a druid could
Wildshape in to something that is
half spider and half crab?


I'm sure there are other examples of
different vermin combinations