Any Idea What This Is - Annelid of some type?

[Popacork]

Don't know what the worm like critter is in the upper left of the image. The shot was of the nudi in the lower right and I discovered the other object when I was processing the image. Anyone know what it is?

http://www.scubaboard.com/forums/attachment.php?attachmentid=166714&d=1379770530

 

[Quero]

It looks like a "medusa worm" to me, but they are actually not worms--they're a sort of sea cucumber/holothurians of the genus ​Synaptula.

 

[KeithG]

Good catch. No idea either. like Quero, I was leaning towards some sort of "spaghetti worm". But there seem to be very few tentacles and the body segments look very long for a terebellidae.

Where was the picture taken? The nudi looks like a white-patch aeolid.

---------- Post added September 22nd, 2013 at 10:12 AM ----------

P.s. and a learning moment for me... Spaghetti worms (terebellidae) include the medusa worm but do not appear to be related to sea cucumbers. But I do agree that it could be something similar to a hidden or beaded sea cucumber.

 

[Quero]

Well, common names are sometimes shared between unrelated species. But the one I was referring to, Synaptula is part of the sea cucumber family. The animal in the picture may not actually be one of those, though, as I peer at it longer---there seem to be too many tentacle-like things at the lower end of it. But anyway, I'm not very good with worm IDs or even sea cucumber IDs, so I could be way off.

 

[TSandM]

We have a ribbon worm in Puget Sound that is red and has cross-banding in white, that somewhat resembles the photo, but I don't know what the oral tentacles would look like. Certainly the tentacles do look like sea cucumber.