Rock Tenticles - Retract when touched

[kKdTx]

These tentacle looking things come out of the holes on this rock containing a small Zoa colony. They retract when touched. Any idea?

 

[bradleym]

It's a micro brittle star. They are beneficial detrivores. Good guys!

 

[kKdTx]

Thanks for the response! I greatly appreciate it. Google can scare the crap out of ya... lol