Twin Cities Ecological Services Field Office

Midwest Region


Twin Cities Field Office

4101 American Boulevard East
Bloomington, MN 55425
Phone: 952-252-0092
Fax: 952-646-2873
TTY: 1-800-877-8339 (Federal Relay)




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Cumberlandia monodonta


The U.S. Fish and Wildlife Service listed the sheepnose and spectaclecase mussels as endangered species.

Spectaclecase mussels.

Photo by USFWS; Nick Rowse


News Release


Sheepnose Information (links to Regional FWS site)


Spectaclecase Information (links to Regional FWS site)


The spectaclecase is a freshwater mussel that occurred historically in at least 44 streams in the Mississippi, Ohio, and Missouri Rivers and in dozens of tributaries to these rivers. It has declined significantly relative to its historical distribution and is now now known to occur in only 20 streams in 11 states. The species evidently is absent from hundreds of river miles and from numerous reaches of habitat in which it occurred historically. Of the extant populations, six are represented by only a single specimen each and are likely not viable. Although many populations have been extirpated for decades, most surviving populations face significant threats.


Spectaclecase Candidate Form (PDF)


Spectaclecase Status Assessment September 2002 (PDF)s



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Last updated: February 11, 2016