Doubtful that's an Anodonta (umbos above the hinge line eliminate that possibility). A. suborbiculata is the only member of the genus in the midwest and I can say with relative certainty that its not A. suborbiculata. Beyond that, its hard to say what you have there. I'd need to see the inside of the shell to make any kind of a call. Kevin Cummings would probably be the best judge since we're talking midwestern mussels here (you out there Kevin?). Other pics are certainly Corbicula.
Cheers,
Mike
Michael Gangloff, Ph.D.
Invertebrate Collections Manager
Auburn University Museum and Natural History Learning Center
101 Cary Hall
Auburn University, Alabama 36849
Voice:(334)844-7345
Cell:(334)332-1533
Fax:(334)844-4065
>>> [log in to unmask] 10/12/05 9:50 PM >>>
Hy Bob,
The large clam looks like Anadonta (or Anadontites but im not
sure they live there). The others seem Corbicula to me.
Regards,
Fabio.
--- Bob Dayle <[log in to unmask]> escreveu:
> Thanks, again, for the help.
>
> Below is my latest (and, probably, last) venture into the
> 'World of Clams.' I
> went back to the stream this evening to pick up a live
> specimen for a snapshot,
> to cinch the identification. It took about twenty minutes to
> get one, but I
> found other mollusc-related things and a few neat stones, as
> well.
>
> The largest shell is empty, is still joined at the hinge and
> is 3.75 inches
> across. (http://cowrys.org/~makuabob/jpgs/big_clam.jpg)
>
> The live clam is about 0.6 inch across. I somehow managed to
> capture several
> aspects of the soft parts.
> (http://cowrys.org/~makuabob/jpgs/clam.jpg)
>
> The single valves and the snail shell can be sized by the
> valve which has its
> inside visible; it too is 0.6 inch across.
> (http://cowrys.org/~makuabob/jpgs/stuffs.jpg)
>
> I doubt that there are any surprises coming out of this creek,
> except, perhaps,
> that Belted Kingfisher I saw last year!
>
> Aloha,
>
> Bob Dayle
>
> ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> > Sounds too big for a sphaeriid (fingernail clam). If the
> "growth
> > rings" were regular concentric sculpture, then you had
> Corbicula.
> > Despite most of the literature, the main species of
> Corbicula invading
> > the U.S. is probably C. leana. A second species is known
> only from
> > the southwest (also invading Europe and South America),
> which may be
> > true fluminea (of which manilensis is a synonym).
> >
> > Unionids may show bands of color or weak irregular growth
> lines, but
> > no regular concentric sculpture in our species.
> >
> > As sculpture rather than growth rings, they form fairly
> quickly and
> > without direct connection to environmental factors. Tiny
> juveniles
> > already have several concentric ribs.
> >
> > Corbicula range from oval (not very elongate) to nearly
> triangular in
> > some large old individuals in lakes. Most unionids are more
> > elongate.
> >
> > --
> > Dr. David Campbell
> > 425 Scientific Collections Building
> > Department of Biological Sciences
> > Biodiversity and Systematics
> > University of Alabama, Box 870345
> > Tuscaloosa AL 35487-0345 USA
> >
> >
>
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