Palythoa (formerly known as Protopalythoa)
Common Name: Button Polyps, Zoanthids, False Coral, Colonial Anemones
Description: Colonies consisting of clusters of separate anemone-like polyps connected at their point of attachment with the substrate, but not imbedded in a common tissue.
Similar: Zoanthus spp. are not usually slimy, don't trap sand grains, and have blunter tentacles.