Thanks, Harry, for those unanswerable questions.  There's room for lots more work.
For myself, I'm going to be sure to walk and snorkel all over my sister-in-law's pond next summer and sample the mussel populations.  There are sure to be more of them, whatever they are.  Should have done it long ago.  The South River is a main border of their property and it has lots of a snail species I have never IDed but the river too should have mussels appropriate to a trout stream.

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