IUCN threat status:

Near Threatened (NT)

Distribution

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The scaleshell historically was found in the upper Mississippi river drainage south to the Tennessee River. States where it occurred include Alabama, Arkansas, Illinois, Indiana, Iowa, Kentucky, Minnesota, Mississippi, Missouri, Ohio, Oklahoma, South Dakota, Tennessee and Wisconsin. The present distribution is within the Mississippi River in Missouri, Oklahoma and Arkansas.

In Michigan, two specimens were recorded from the Grand River. However, attempts to find this species again have been unsuccessful. Some biologists feel the historical occurrence of this species in Michigan is doubtful.

Biogeographic Regions: nearctic (Native )

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Source: Animal Diversity Web

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