brown cream outer mother of pearl inside
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A Scallop yes, but not Pecten maximus (Default dictionary-speak).
There's a good chance this is Bractechlamys nodulifera but the pic isn't really quite good enough.
I failed to form the ID twice because I used a capital for Scallop, I changed the case, offered by the Common Name drop-down, to scallop and guess what?
THREE MARINE PROJECTS
Lat/Lng: -25.035, 46.9797