Biologically, mussels and clams have their differences, but colloquially we call them all "clams." We illustrate our 58 Wisconsin species, including exotics, at adult life size as well as young versions. Each species reveals its unique beauty, shape, and identifying features. Sadly, illustrations may be all you ever see of some of these vital environmental-health indicators. At least two species are considered extinct, and many more are threatened or endangered.
