Harvesting the River: Archives: : Threeridge -- Illinois State Museum


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The Threeridge, Amblema plicata (Say, 1817), named for prominent ridges on the outside of its shell, is currently the most common mussel in the Illinois River. It made up 62% of the live mussels taken in a 1966 mussel survey and was the most abundant species in most segments of the river.
Illinois State Museum Collection (ISM-673298).

Photograph by Robert E. Warren, Illinois State Museum.

The <b>Threeridge</b>, <i>Amblema plicata</i> (Say, 1817), named for prominent ridges on the outside of its shell, is currently the most common mussel in the Illinois River. It made up 62% of the live mussels taken in a 1966 mussel survey and was the most abundant species in most segments of the river.<br>Illinois State Museum Collection (ISM-673298).