Believe me, I have the oldest books on the planet. I had no idea you were so possessive of worm photos. Here's one for you. I was looking at this Dendronephthya and realized there was a polychaete worm wrapped around a branch: my guess is that it is Odontosyllis sp.
I took this at Albatross Pass near Three Island Harbor just north-west of Kavieng, in PNG.
I'm not, it just seemed like a fun opportunity to tease Eric & play off my own reputation as a worm freak!!
But I do like worm images so thanks much for yours. Was this taken at the same place & time as Eric's image of the Hippocampus with the worm wrapped around it? I'll agree that the worms are syllids but there's not enough detail on either pic to say what genus they are. It looks like they're coming out to spawn - another nice piece of behavior captured in pixels!