Description: English: Sheepnose mussel, Plethobasus cyphyus. From Flickr: "The sheepnose is a freshwater mussel that has been proposed for listing as endangered.". Date: 3 August 2005. Source:
https://www.flickr.com/photos/usfwsmidwest/5370530833/. Author: Kristen Lundh, USFWS.