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Feel free to hit up www.rogersmushrooms.com to try and take this thing down to a specific species.
This is a species of Corbicula, and I would expect that this is Corbicula fluminalis, the only species of the genus Corbicula listed as being native to Iran. If you have any photos of the interior of the shell, that could help with the ID (though on a specimen this long deceased, maybe not).
Here's the link I used to narrow that down:
http://www.iucnredlist.org/details/15616...
It's not as well known or as well studied as C. fluminea (nor is it as widespread and invasive worldwide), but C. fluminalis is still an invasive over much of Europe.
I've found a bunch recently and someone else on this awesome website was kind enough to give me the ID, so I'm paying it forward!
Also, thanks for another Eric!
Why thank you Aaron. I blame the sunlight.
I think you hit that one right on the head bayucca! Thanks.
Great! I had assumed he was from the egg case we'd bought earlier this year (which I always thought were those of the Chinese mantis), but am just now reminded that we had bought that last year. It makes me happy to know that my back yard is suitable habitat for such awesome critters!
I say white tail. That odd looking track appears to have had sand fill the right-hand depression, giving it an odd, three toed appearance, but in the close up, you can still see the arc of the original footprint.