Olivier,

Just a guess: if Julia is inequivalve, then
perhaps the right valve falls off the dead animal
first and is lost in deeper water, while the left
valve stays attached to the animal longer and is
washed into shallow water along with it. Or
perhapse the right valve is more delicate and
disintegrates faster (similar to what I
experience with Pododesmus on my coast; you often
find the thicker valve in the beach drift but
rarely see the thinner valve). Just guessing.

Peter


At 03:25 AM 18/04/2011, you wrote:
>And Julia borbonica Deshayes 1863 is considered as a junior synonym of
>Julia exquisita Gould 1862 (who gave us the genus name Julia). Maybe a
>local form ?
>
>Thanks for all this helps. I did not imagine it was possible to have a
>bivalved Gastropod, but Julias show this case exists. The little mistery
>is : why did I get only left valves?
>
>Le 18/04/2011 12:01, Peter Egerton a écrit :
> > Ah yes, Julia. That's the name I was trying to remember; was thinking
> > it was a woman's name, but couldn't come up with it. Julia.
>
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