Thanks again for the many suggestions and off-list information.
To answer some of the identification concerns, I have returned to the stream
once more to find more specimens. Also, I have made additional images of the
"big_clam" which show both sides of its valves.
First, I found two more live Corbicula, smaller than the one imaged before (it
went back to the stream, alive, several days ago). I left them in situ. About
20 single valves of Corbicula were found before I hit upon a second
"fingernail" valve. The valves of one emptied Corbicula were brought back for
imaging. The two Sphaeriid valves (both seem to be the same valve but I don't
know left from right when it comes to bivalves) have been included in these two
images (the green bead is 6.0mm in diameter):
http://cowrys.org/~makuabob/jpgs/bivalvs0.jpg (outside)
http://cowrys.org/~makuabob/jpgs/bivalvs1.jpg (inside)
Second, I found two gastropod shells in the silty gravel which produced the
Corbicula and Sphaeriid valves. I have no idea if these were aquatic or
terrestrial. These can be seen at:
http://cowrys.org/~makuabob/jpgs/gastros0.jpg (top)
http://cowrys.org/~makuabob/jpgs/gastros1.jpg (bottom)
Last, to aid in getting an ID on the large clam, I made these two images:
http://cowrys.org/~makuabob/jpgs/bigclam0.jpg (top)
http://cowrys.org/~makuabob/jpgs/bigclam1.jpg (bottom)
Aloha,
Bob Dayle
__________________________________________________________
Quoting "Kevin S. Cummings" <[log in to unmask]>:
> I think Alan is right on the mark with his ID's. The larger dead
> shell does indeed appear to be Strophitus undulatus
> http://www.inhs.uiuc.edu/cbd/musselmanual/page82_3.html Without an
> inside photo to see the hinge line I wouldn't bet the farm on it, but
> I would be will to go a six-pack.
>
> The second photo is of a live Corbicula fluminea or whatever we are
> calling the Midwestern invasive these days.
>
> The third group is a mix of Corbicula (top row left and the two on
> the right in the bottom row)
> http://www.inhs.uiuc.edu/cbd/musselmanual/page174_5.html, a Sphaeriid
> (bottom left - I don't speak Sphaeriid either)
> http://www.inhs.uiuc.edu/cbd/musselmanual/page172_3.html
> and an Elima (perhaps livescens).
>
> My 2 cents
>
> Kevin
>
>
> >Date: Wed, 12 Oct 2005 22:29:09 -0500
> >From: Michael Gangloff <[log in to unmask]>
> >Subject: Re: Freshwater clam question...
> >
> >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
>
> >
> >Date: Thu, 13 Oct 2005 06:10:21 -0400
> >From: Alan Gettleman <[log in to unmask]>
> >Subject: Re: Freshwater clam question...
> >
> >Bob,
> >The largest dead shell is Strophitus undulatus, the rest are the Corbicula
> >except for the very smallest single valve which looks like a Spaherid
> >(Fingernail) clam. I don't speak Sphaerid so don't know the actual species.
> >Kingfishers are neat as they perch very regally on signposts or other higher
> >poles/trees to proudly proclaim their presence.
> >
> >Alan Gettleman
> >Merritt Island, FL
> >Where it just continues to rain. . .
> >
> >Date: Thu, 13 Oct 2005 17:07:50 -0500
> >From: "Dr. David Campbell" <[log in to unmask]>
> >Subject: Re: Freshwater clam question...
> >
> >A hinge view could be helpful in pinning down whether the smallest one
> >is a big sphaeriid or a small Corbicula. It's also usful for unionids,
> >but Strophitus undulatus sounds plausible. As the type of Strophitus,
> >it actually is a Strophitus, unlike S. subvexus and S.
> >connasaugaensis.
> >
> >--
> >Dr. David Campbell
> >425 Scientific Collections Building
> >Department of Biological Sciences
> >Biodiversity and Systematics
> >University of Alabama, Box 870345
> Tuscaloosa AL 35487-0345 USA
> --
> Kevin S. Cummings
> Illinois Natural History Survey
> 607 E. Peabody Drive
> Champaign, IL 61820
> [log in to unmask]
> http://www.inhs.uiuc.edu/cbd/collections/mollusk.html
>
> The Mussel Database Project
> http://clade.acnatsci.org/mussel/
>
> Join the Freshwater Mollusk Conservation Society Today!
> http://ellipse.inhs.uiuc.edu/fmcs/
>
> "When the going gets weird, the weird turn pro"
> HST: 1937-2005
>
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