<a href=showthread.php?s=&postid=12925742#post12925742 target=_blank>Originally posted</a> by MinibowMatt
generally, Fungias can have much more variability in their shape, and are usually much flatter that a Cycloseris.
Cycloseris are much more 'round' than fungias, usually with broader valleyd between septa, and most commonly form some type of a domed shape toward the center. Cycloseris also top out in a much smaller size than fungia's.
Those are all very nice. I have three cycloseris myself. One, I got as a baby polyp, still had its stem. It has recently detached from its stem and the stem, is now growing a new polyp!