Pretty surprised when I found this. Pulled a caddisfly larvae out of a small alpine pond because it had something white on it and it turned out to be a small (half a pinky fingernail) sized bivalve. Didn’t expect there to be any bivalves in the alpine so incredibly curious what this could be
Several found on plastic strip used for Black fly sampling. The first two photos show one upside down with its "foot" exposed.
Found on fallen branch a few inches underwater in wetland
Molluscs found in currently drained 'winterbourne' stream.
Shells collected, studio photos to follow.