<a href=showthread.php?s=&postid=15279281#post15279281 target=_blank>Originally posted</a> by flyyyguy
the main difference lies in the fact that they are different genus
palythoa and protopalythoa uptake substrate to make up their structure as well as palythoa tend to grow in true mats as seen by the pics posted of actual palythoa above. Zoanthids do not uptake substrate to build their structure, they may have stuff stuck to the outside as they grow around stuff but it is just their and not how they buidl themselves. There are other differences if you dig deeper but that is the main thing. The word paly has somehow become synonymous with all large polyps, and the size of the polyp means nothing. Most things commonly called palys by hobbyists and retailers are simply large species of zoanthids.
It really doesnt matter as the care is generally the same and with just a few exceptions visually being able to tell one species of zoanthid from another, and one species of paly from another is about impossible. But identifying zoanthids from palys is easy enough to usually tell visually, especially with the polyps closed.
Its just a stupid pointless pet peeve of mine hearing all large polyps called palys becasue of their size. lol![]()