with ophiuroid (Asteroporpa annulata? I think?) living on the spines!
But who is it? Not sure..
Other noteworthy observations!!
A Enypniastes like species (possibly Amperima or Peniagone?) with transparent body.... That's the gut you are seeing THROUGH the body wall.
And finally... one pic full of intrigue! my "phantom" wood starfish?? Did I see it or not? A revisitation to the HD is in the stars....