John Cramer wrote:
> A colleague has given me a freshwater shell he collected dead on the Michigan
> shore of Lake Michigan in 1962 in shallow water.  He can't recall where. It's on
> my web site, http://www.oglethorpe.edu/faculty/%7Ej%5Fcramer/ ; click on
> "shells."  It's a rather heavy shell with large, strong cardinal teeth.  I think
> it's an elliptio complanata but the shape doesn't fit the pictures I have of
> that species very well.  It does not have a posterior ridge, more like several
> week ones.  Is the ID just obvious to anyone?

* I'd say Lampsilis radiata siliquoidea, with pinkish nacre. Pink nacre
is supposed to be more frequent in L. r. radiata, but I've seen it in
siliquoidea-like shells in eastern Ontario. But of course Unionids of
the same species look different from different parts of their range, so
it may be something else...

fred.
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             Bishops Mills Natural History Centre
           Frederick W. Schueler & Aleta Karstad
        RR#2 Bishops Mills, Ontario, Canada K0G 1T0
     on the Smiths Falls Limestone Plain 44* 52'N 75* 42'W
       (613)258-3107 <bckcdb at istar.ca> http://pinicola.ca
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