Worm?

[rojees]

Hi everyone ,

For context, you’re looking at a toadstool leather, which has closed up for 2 weeks, on a small rock island.

As you can see in the photos, there is some kind of “thing”, I don’t even how what to call it. Worm?seems to be from the small rock.

Can anyone I D it?

 

[Gman83]

It looks like a worm, but i can't say what kind. I think bristle, but not sure