Live Rock Hitchhiker

[ChrissAnn]

I am a newb to saltwater, experienced freshwater.

Anybody know what this is?  it opens and closes and it looks like a worm type of tongue comes out in which you can't see unless you are zoomed up close with a camera or phone.  It spooks with attention and quickly closes, but not like a clam.... more like a scissors.  It's as small as a dime.

 

Any input is appreciated!

 

[IamJoHo]

Welcome. No idea what it is but it looks interesting. 

[MainelyReefer]

Back end of a mussel/clam.  I got some KP Aquatics live rock and over a year later a bunch of these mussel with fringed edges started popping up.  I bet they settled before the rock was picked and just took time to grow  and notice. 

[RayWhisperer]

Looks like a thorny oyster, Spondylus americanus. Which, is actually a type of scallop, not an oyster at all. Filter feeder, harmless, somewhat difficult to keep alive long term, gets rather large. Cool hitchhiker, congrats.

[ChrissAnn]

Thank you all for answers, but i, I still feel as I’d its none of the above.  

[WV Reefer]

I put this in the other thread also. 

 

Barnacle. Not sure of name. 

 

 

 

[ChrissAnn]

3 hours ago, WV Reefer said:

I put this in the other thread also. 

 

Barnacle. Not sure of name. 

 

Where did you find that picture?  Although yours looks similar, I did a search on Barnacles, but am not finding anything pointing to these being in the Barnacle family.  Can you find out more information, Christy.