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Protopalythoa sp.
zoanthids in shallow tide pool on large uncovered reef flat
Nearshore shallow water tropical coral reef ecosystem
Spotted just off the southeast end of Mokauea Island on the uncovered tidal flat. Also known as "button polyps." Three individuals are visible in the image. The largest is centered. The smaller is a short distance away to the lower left. The other is snuggled up to the biggest to its lower right.
fishpics: mahalo for the ID. You helped me learn the difference between anemones and zoanthids.