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Pimpleback (Quadrula pustulosa)

The Pimpleback (Quadrula pustulosa) is a medium-sized mussel with numerous bumps (pustules) on the outside of its shell. In a 1966 mussel survey it was the second most abundant species in the Illinois River. Despite its intermediate size, it was valued by button makers for its lustrous white shell interior (nacre). (Conservation Status: Currently Stable)
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