i am not an expert, but the color, shape,  and localities are typical
of M edulis.
the brown color morph is very common, and the inside seems typical too.

On 4/24/12, Paul Mikkelsen <[log in to unmask]> wrote:
> I've been asked for help with an ID on a mytilid bivalve, and need input
> from others.
> Here's what I know about the clams:
>
> They came from a water intake on a large vessel docked in Fort Lauderdale,
> Florida, USA.  They were in such numbers, they were described as an
> "infestation".  We know that the vessel visited the following ports: Nassau,
> Charleston, New Port, Cape Cod, Portland (Maine), Bar Harbor (Maine),
> Halifax, Prince Edward Island, and Boston.   Cruising dates included 11 June
> to August 12, but it's unknown where the vessel was at what time, or if the
> vessel made it to all the above ports in that amount of time.
>
> Additionally, it may have also traveled into other areas of the Caribbean or
> even the other side of the pond (so we can't rule out the Mediterranean).
>
> The photographed specimen's longest dimension is 9.6 mm;  I have a few
> others that size and smaller.  I don't know if/when the vessel's intake had
> been cleaned prior to the mussel "infestation" and thus can't speculate on
> their age.
>
> The following links (hoping one works!) should take you to the same photos.
> View Album
>
> Play slideshow
>
> https://picasaweb.google.com/lh/sredir?uname=108580848782880140183&target=ALBUM&id=5735160855975191697&authkey=Gv1sRgCLHN3qmnr-iq0gE&feat=email
>
> Any help/guidance/guess is appreciated!
> Thanks!
> Paul Mikkelsen
>

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