ID requested

[JZinCO]

Posted this in my tank thread in the macroalgae forum but reposting for more eyes..

I got a couple hitchhikers on the Halimeda incrassata.

Any ideas? Appears to be a bivalve. It looks almost like a Venus flytrap. Opens and closes its mouth with thin outward projecting hinge teeth.. The green color is odd.. either this is a plant or bivalve looking animal that either sucks chlorophyll from host algae or is colored green as a camouflage..

edit: hint, This was collected in the Keys.

 

[AlSimmons]

Picture?

 

[JZinCO]

Picture?

You should be able to see it, otherwise:
http://reefcentral.com/forums/picture.php?albumid=11194&pictureid=76812

 

[JZinCO]

I'm gonna go with wing oyster. Facing the shells it has the same shape.
http://www.reefcentral.com/forums/showthread.php?t=1099311 (one reference I found)