Chthonian
Tentacles are involved. Bad things happen.
Here is an example of a tentacles-in-the-middle type Cthonian Critter. The two halves are held together by the outfit. You could pin it together, I suppose.
As you can see, it becomes creepier and creepier...
Until it begins to look as though it is crawling away.
Oh dear.
This fellow sure the heck is orange. His orange body matches the sucker-area of his tentacles, and he has magnets on all of his, uhhh, podia. Podia, right? Sure.
I should probably call this category "Tentacles" because that's really what's going on with Cthonians. Does it have a tentacle? It's a Cthonian!
Not shown here yet are the ones with tentacles coming out of their face. Hee.