Yes, some answers I receive propose Donacilla cornea.
It's the right pattern, the right "milky" fat layer inside valves, but
the general shape is strange...

Here is the link to "my" cornea:
http://www.idscaro.net/sci/04_med/class/fam5/species/donacilla_cornea1.htm
And here is an other pic of "cornea" that look like my mysterious shell:
http://bigai.world.coocan.jp/pic_book/data55/r005460.html
To replace things in a context, I send the link to my Mesodesmatidae
plate:
http://www.idscaro.net/sci/01_coll/plates/bival/pl_mesodesmatidae_1.htm

Could it be possible that my first corneahad an unusual form, with
extremities more angular than rounded?

Thanks!

Olivier


José H. Leal a écrit :
> Could it be Donacilla cornea (Poli, 1795) in the family Mesodesmatidae?
> ________________________________________________________
> José H. Leal, Ph.D., Director
> The Bailey-Matthews Shell Museum
> Editor, The Nautilus
> www.shellmuseum.org
>
> 3075 Sanibel-Captiva Road
> Sanibel, FL 33957 USA
> (239)395-2233
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