IUCN threat status:

Critically Endangered (CR)


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Historically, the northern riffleshell was found in the Ohio river drainage in Illinois, Indiana, Kentucky, Ohio, Pennsylvania, and west Virginia, and into southeastern Michigan and southwestern Ontario. Today its range is restricted to southwestern Ontario, the Green River in Kentucky, Big Darby Creek in Ohio and French Creek, LeBoeuf Creek and Allegheny River in Pennsylvania.

In Michigan this species was historically found in Lake Erie drainages. Specimens were collected from the Clinton River and lower Huron River, however no individuals have been found since the 1930s. Recent populations were found in the Black River up to 1998, the lower Raisin River up to 1977, and the Detroit River in the 1990s. However, with the invasion of the zebra mussel into the Detroit River, the population is likely extirpated from Michigan.

Biogeographic Regions: nearctic (Native )


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Source: Animal Diversity Web

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