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Pisidium (Pea Mussels) but which sub genus?

Observed: 26th June 2013 By: charliespringer
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Description:

I have a triving colony of these little cratures in my tiny garden pond. I live on the boundry of the RSPB Pulborough Brooks (No reply from my enquiry there) I wonder if anyone can identify the sub genus and if so, are they rare?
My garden pond is rainwater fed, deep silty bottom and shaded.

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