Living "sea shells" ?

[SleepyPirate]

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?

[whatcaneyedo]

Sea shells? As in snails?

[SleepyPirate]

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

[whatcaneyedo]

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

[ScubaSteve]

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

[SleepyPirate]

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.

[SleepyPirate]

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


http://imageshack.us/photo/my-images/39/20110711185825.jpg/