you know a jaw or mouth where the jaw full of teeth fully rotate like a drill or gear to shred their food or prey, usually show often in worm type of monster (my question is not necessary to be worm type), rather than chewing, or simple biting, or simple enclosing and opening the mouth with the circle type of jaw or row of teeth like lamprey or leech
here a gif image to help imagine it better, just focus to the blue gear, ignore the smaller one. (depend to the answers or how well this is, i may add another question related to the small one later)
the gif from pinterest
just to be clear my question is about full rotation not half rotate, like when the jaws move back and fort in half circle to grind or shred ( i hope its understandable)
example like this, this is the closest i can find.
the gif from Gfycat
its not necessary to be circle shape of jaw either.
it may or may not have tongue, i believe its dangerous if they have tongue, but i do thought to put the tongue in front or outside of the rotating jaws at least.
this is pure organic, so robot,cyborg, or bionic is out of the question.
so i want to know how it work or the anatomy or musculature to achieve this, preferably with image to understand it better.
or maybe there already exist an animal like that?