I figured people my enjoy a quick tutorial on the only 2 bivalves that I don't study and that might be confused with the native freshwater mussels I do study. The first is the Asian clam (link below). It rarely grows larger than 1 inch (rarely up to 1.5 inches) and does not have the tell-tale pearly inside like our many native mussels. The second I do not study is the zebra mussel. This clam rarely reaches a inch in size and hasn't spread across America as far and wide as the previous invasive species from Asia (thank god!). Where its found, its a huge nuisance. Pretty much, if you find a mussel that is larger than a inch and pearly inside, its definitely a native mussel.
Here is examples of the Asian Clam:
http://www.europe-aliens.org/images/..._Corbicula.jpg
http://www.malacsoc.org.uk/The_Malac...a_fluminea.jpg
Here is zebra mussels:
http://www.fishingireland.net/enviro...bramussels.jpg
Here is a really nice pile of our nativemussels:
http://www.nature.org/wherewework/no...protect_20.jpg
http://filebox.vt.edu/users/guyot/im...dt_mussels.jpg



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