Bz - In WI the small clams (freshwater mussels) were probably fingernail clams. There are four groups (genera) two most common -Pisidium (most species) and Sphaerium. Pisidium tends to be a little smaller than Spherium. Large ones are 1/4"-3/8".
Last edited by Bill Cody; 01/24/10 05:54 PM.
