Perna-Shell of Albena, Bulgaria?

[Herner]

Hi,

I found this shell on the beach of albena.

they are certainly very heavily worn.

Possibly Perna or heavily eroded shells of Crassostrea gigas?

Size: 39,5 x 12,5 x 4,4 mm

I also found there are similarly shaped shells, but they were light brown or white.

Greetings Herner

[img width=640 height=437]http://matzlpage.de/data/media/2240/08d.jpg[/img]

...and here are more individuals of the same species:

<!-- m --><a class="postlink" href="http://matzlpage.de/details.php?image_id=10595">http://matzlpage.de/details.php?image_id=10595</a><!-- m -->

[paul monfils]

It is quite similar to the Mediterranean Perna perna, but I can't say for sure if it is that species.  It is not a Crassostrea.

[Herner]

hello Paul,

..I am in despair!

On the site there were very many of these mussel shells.

there flows into the sea a river, so it is brackish.
Maybe it's not a sea shell, but a freshwater mussel?

[dave r]

Looks to me like a very worn Mytilus.

[Herner]

Hi,

perhaps a very worn Mytilaster or Modiolus phaseolinus?

The shell is not so fragile as the Mytilus species.

It is relatively hard.