I treat these issues using images of Lindapecten muscosus at my website.

http://z14.invisionfree.com/Conchologist_Forum/index.php?showtopic=546

There are three slides, so be sure to pagin down.

Marlo
Merritt island

-----Original Message-----
From: Conchologists List [mailto:[log in to unmask]] On Behalf Of
David Campbell
Sent: Monday, October 22, 2007 1:32 PM

> Telling left from right valves is not one of my strengths, but I get
really confused about pectinid left and right valves. Upper and lower make a
bit more sense to me. Is there an easy way to remember?<

Pectinids sit on the right valve, which is often deeper (especially in
Pecten, Euvola, etc.).  The ear with more of a notch (especially on
the right valve) is anterior.  Oysters sit on their left valve.

--
Dr. David Campbell
425 Scientific Collections
University of Alabama
"I think of my happy condition, surrounded by acres of clams"

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