Clam? scallop? Mussel? Help ID

[KosmicReef]

Hard to see in picture due to awkward angle of where the thing is. Sort of reminds me of a clam or something. The inner area is like lines of ridges that are blue. Outer shell area is like a blueish brown color. It closes up and you can no longer see the blue ridged area when it’s closed. Can anyone ID. Thanks.

 

[Jay Hemdal Verified Community Expert]

Possibly a small wing oyster.

Jay