Zebra Worm?

[-Nemo-]

Spotted a worm looking thing hanging from a piece of LR a little while ago, did some quick research, couldn't come up with anything. Stinky picture but it kept moving in and out of the rock, not to mention the angle was horrible.

It has black and white stripes and thats all I could really spot.

 

[AK77]

The photo isn't at all clear but it does look like the Syllidae Eusyllinae.