<a href=showthread.php?s=&postid=14524012#post14524012 target=_blank>Originally posted</a> by Reef Bass
Ah, good point. The unusual shape would be useful in the trapping of passing food stuffs, and quite possibly enough so that the lack of tentacles wouldn't be a survival disadvantage.
I wonder if that polyp were to give rise to others if they would be similarly shaped? Its shape could be the result of either an error in its dna which doesn't allow for "proper" formation or some sort of negative environment impact, either chemical or physical, which derailed its forming normally.