cant figure this one out

please help identify this on my lr. it took a month to get a picture of it because it sucks in to the lr.
 

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Total stab in the dark, but could it be some sort of anemone, like a rock flower anemone that closes up and looks like it sucks into the rock?
 
I can't make anything out of the pic. Does it look like it has tentacles? Does it have a mouth? When does it pull back in the rocks with lights on or off? Anything else you can add to the description?
 
This is all that it is. The thing in the orange square is it. It sets flat on the rock otherwise. It has a little slit in it and i too cant make out whats inside
 
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