I have a bunch (3-4) of these tubes growing around the base of my Finger leather. I'm assuming they harmless since the coral shows no Ill effects and just keeps growing. What type of creatures are these?
They are not chaetopterids either. Although some get large, not these with this kind of tube. It is te '"U" tube type that get large, where the worm is in the buried in the sand.
You can not go by Kelly's image. That could be the head of a feather duster, that has lost the top sticking out or just part of the duster top. You also can not tell the difference really between a chaetopterid and a Spionid unless it is sittng in from of your face on a lab bench, under a scope. I think Leslie is looking at my pic and not the one at the top of this post. And my pic is a properly ID Spionid and not a Chaetopterid. However, chaetopterid tubes of this type, can get up to about two inches maybe and she is at three inches. Her pic is about a 3 " tube and to big in dia.
Finally, these worms grow in the sand and mud and hers is attached to a coral. They do not live that way. I should have said that right off. Got excited I guess :lol: