Is this your animal?

http://www.molluscan.com/tripreports/thailand_2_2003/10022003/market03.jpg

I agree with Alan about contacting Marion Havlik and Kevin Cummings.  My brother found some empty shells in a reservoir formed by damming Raccoon Creek, I believe.  Those ridges are very prominent and regular.  We have thundering herds here in Washington state, particularly around boat launches. 

-----Original Message-----
From: Bob Dayle [mailto:[log in to unmask]]
Sent: Sunday, October 09, 2005 2:49 PM
To: [log in to unmask]
Subject: Freshwater clam question...

I was wading in the local creek (central Indiana) when I noted a single valve in the foot-deep water. Hoping to stir up its mate, I came up, instead, with a live clam. At a mere 3/4-inch across, it was rather small,... to someone who has seen three foot wide Tridachna gigas in situ.

Since it is illegal in this state to disturb or molest ANY mollusk, I tossed it back after noting that the valves were dark brown at the hinge but quickly gave way to an algae-green color other the rest of the shell. I estimated about 15 "growth rings" on it.

The questions are two: 1.) Does anyone care to guess what variety of plecypod this is?, and 2.) What time interval is associated with the growth marks,...

annual, lunar, sesquiquadrate aspects to the synodic period of Venus,.. or what?!

Bob Dayle

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