Turquoise worm-night Anilao Pier, 2015-Alien Attack, Turquoise worm-night Anilao Pier, 2015-Alien Attack,Janine Baker;Most likely Eunicidae epitoke, less likely Lumbrineridae. The spawning forms rise from the surface at night and swarm with predictable periodicity, related to the moon phases. We have a similar dark green one here in SA which does this, and divers have observed animals to at least 10cm during night dives. Your animal is even bigger! there is a related species of eunicid in the south Pacific, Eunice (or Palolo) siciliensis, which is used as a food delicacy. the spawning epitokes are collected when they rise into the water column. Yes, although I cannot see features up close in your photo (and I am not a worm taxonomist) if it is a eunicid epitoke it would be the same family as bobbit worm. Sorry - SA in this case = South Australia, not South Africa, but similar dark green swarming epitokes are found there too.