DSC03254

DSC03254

Observation - DSC03254 - UK and Ireland. Description: The shell is 7cm long,and has an indentation on the left side. The indentation is natural because I found 3 like that. Please can anyone identify this freshwater mussel for me?

The shell is 7cm long,and has an indentation on the left side. The indentation is natural because I found 3 like that. Please can anyone identify this freshwater mussel for me?