Living "sea shells" ?
 

Ok so I noticed today I had a few "sea shells" alive and moving in my tank, mostly they just try to hide, what are these guys I have a ton of dead ones in my sand but I never put much thought into living ones and what they are?

anyone know much about these shells?

Sea shells? As in snails?

No likes as in Oysters or sometimes very small right now about 1" they seem to burrow in the sand actually seen one on glass but acidently knocked him off

So its a bivalve and not a prosobranch? Can you supply a picture?

Is it one half of a shell? Could it be a stomatella snail?

Looks just like a bivalve from what I looked up. Its under the sand now but I first seem him sticking to the glass before I acidently knocked him into the sand before he burrowed under.

The best picture I could take of the small one, seems to be sitting like this.


http://imageshack.us/photo/my-images...711185825.jpg/