snail ID help?

[Lrood]

I have seen this snail a few times in my refugium, usually after lights out when I am looking around with a flashlight. Today it was on the back wall (thus the somewhat grainy picture). Total length is about 3cm. It's shell is a flattened, abalone-shaped structure. Anyone have any ideas on it? It does seem to love hair algae.

 

[Lrood]

Another note - the shell somewhat reminds me of the lady slippers I find on the beaches in Florida, but this one is much more flattened.

 

[rssjsb]

Stomatella.

 

[GerritM]

+1 --> Stomatella varia

 

[Lrood]

Thanks!