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normally at first glance the palys have a little line at the mouth
Red People Eater Palythoas
A zoanthid. As mike stated, zoanthids do not have a long mouth. Also, when a palythoa is closed you can see striped on the back side of the polyp. You can see them on the left polyp in the photo that Mike posted.
Even Zoas have a slanted mouth (it's simply smaller, just as the zoas are smaller). However many palys have a highlighted mouth (typically neon green). Although there's plenty of palys without green mouths as well. Ultimately I judge a polyp as a zoa or a paly, based on whether or not it is responsive to feedings (not simply responsive to touch, but actively closes in on food for the purpose of consumption). The photo above is a really good example of this!! :bigsmile:
A zoanthid. As mike stated, zoanthids do not have a long mouth. Also, when a palythoa is closed you can see striped on the back side of the polyp. You can see them on the left polyp in the photo that Mike posted.
zoas cant do this to a chromis...