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Spirobranchus giganteus
Brilliant blue plumes looks like a fountain.
Coral reefs
Hi Laura, thank you so much for the info. I had no idea that these were worm gills. I assume my other 'polyp' photo is not actually a 'polyp'! Every day is a school day!
And yes, that photoblog is mine, I am honoured you remembered the photos. Thanks again :))
Hi Nick, these aren't coral polyps, but a kind of polychaete worm called a Christmas tree worm! They bore into corals, and those beautiful plumes are actually their gills! I am just curious though, I found this image on another website, on a photo blog, could you confirm whether or not this site is yours? http://nickporteous.tumblr.com/ Thanks!