Strange clam-like animal?

[Marinefish]

There is an odd little hitchiker on a piece of mushroom rock from LiveAquaria.com that I have had for almost a year. It has a clear shell that looks like 2 tiny coins standing on their edges about 1mm apart. The body is transparent, and looks like a tongue sitting between the shells. It occasionally pokes a tiny siphon out the top of the shell. When it is disturbed, the body vanishes, apparently pulled into a hole in the rock, but I have never seen the shell move. There used to be a lot, but my pistol shrimp buried the rock and this is the only one I have left. The older ones were about 1/2" tall and had a pink tint.

[Original Fin]

Hey Marine, Google Stomatella Snails and chitons...look like either of those?

[Marinefish]

Hey Marine, Google Stomatella Snails and chitons...look like either of those?

Definitely not one of those. It looks like someone replaced a clam's shell with tiny clear coins standing on their edges. BTW, I clarified my description of the critter

[Marinefish]

Anyone?

[Marinefish]

Just found another clam on the same rock. Its shell looks like a regular clamshell, but it has a pattern resembling tiny red and green tiles. Any ideas?

[Marinefish]

I think the clam-thing may be a windowpane oyster

[Reefing Madness]

I think the clam-thing may be a windowpane oyster

Without a picture its just like throwing darts here.