Freshwater mini-clams? Found 'em, but does anyone know anything about them?

[knifegill]

These little buggers look like bits of quartz gravel and if I hadn't been trolling the mud for bugs, I'd never have noticed them at all. The biggest ones aren't even 1/8th of an inch wide. They seem to be almost perfectly symmetrical. The shell surface is smooth, glassy and gives a high shine, again much like quartz gravel. Any guesses on which species this might be?

EDIT: I found a pic on the web, but no info yet. They are a lot like these, if not the same. Ignore the fish guts.

http://www.hilakers.org/pages/stomachcontents.html

 

[aquaculture]

All I know is:

Rapheals love clams.

Clams need to filter their food.

Wish I had those minis.

and BUMP

 

[Kaosu]

..never seen them but my uncles property has a stream FULL of fresh water muscles..they are neat^_^

 

[LRM]

Fingernail clams. Very common is seasonal wetlands. I assume you're in the US, possibly the northeast or great lakes area?

 

[Burto]

Are they Corbicula fluminea?
http://en.wikipedia.org/wiki/Corbicula_fluminea
http://aqualandpetsplus.com/Bug, Mini-Clam .htm

 

[knifegill]

Fingernail clams is right. Thanks so much! Yes, they are from a wetlands, but in Washington.