1st hitchhiker?

[sinful]

just noticed this on one of the rocks, not sure if I should be concerned. Anyone know what it is?

 

[ladyfsu]

a hole? ... I think that's what is in the center of the pic!!!!

ok, if it is just above the hole and looks like a white triangle, I'd say it is a small feather duster upside down.

 

[ryan115]

Could be a zoanthid polyp. It is kind of hard to tell from the pic...can you get some more descriptive characteristics? Does it draw itself back in, it is rigid?

 

[sinful]

ok look again, I put an arrow pointing at exactly what I'm talking about. what you think is a hole is what i"m talking about. umm characteristics....it doesn't move at all , kinda hard and has prikly things at the end of it

 

[alizarin]

I know it's hard to get good closeup shots but that picture's not close enough to really say. It looks/sounds sort of like a palythoa/button-polyp (related to zoanthids) look at these pictures on google images for example:
http://images.google.com/images?q=button polyp

Button-poylps are soft corals (although technically I think they're anenomes) .

Also, this is an awesome page for identifying different hitchikers:
http://www.reefs.org/hhfaq/