When they begin to split you will notice that you have two separate "circles" of tentacles instead of just one. That's what they mean by "pinched." In other words instead of having two mouths with just one common oval shaped grouping of tentacles surrounding both mouths, you will start to see the animal pinch in to form sort of a figure eight shape before pulling apart. That's one way that Ricordea spp. can split. That's what you are seeing with yours right now except that the part on the right is rising up and facing away as it pinches between the two separate groupings of tentacles.
They also reproduce by moving and leaving a tiny piece of themselves behind that forms a new polyp. You can propagate them by slicing them with a sharp razor blade into pie shaped wedges but I have never done that.



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