Home > Harvesting > Freshwater Mussels > Species> Three-ridge   Threeridge (Amblema plicata) The Threeridge (Amblema plicata), 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. Button makers and pearl producers favor this species for its large size and thick shell interior (nacre). (Conservation Status: Currently Stable)

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