- Source: Plethobasus cyphyus
- Plethobasus cyphyus
- Plethobasus
- List of endangered species in Missouri
- IUCN Red List endangered species (Animalia)
- List of endangered invertebrates
- List of endangered molluscs
- List of endangered and threatened animals and plants of Illinois
- IUCN Red List near threatened species (Animalia)
- Environment of Iowa
Plethobasus cyphyus, the sheepnose mussel, is a species of freshwater mussel, an aquatic bivalve mollusk in the family Unionidae, the river mussels.
This species is endemic to the Midwest and Southeast United States. It is currently listed as endangered by the U.S. Fish and Wildlife Service, and it is no longer present in two-thirds of the waterways in which it was historically found.
Host fish species for the sheepnose's glochidia include Pimephales promelas, Semotilus atromaculatus, Campostoma anomalum and Culaea inconstans, while attachment to sauger (Sander canadense) has been described but transformation into juvenile mussels following parasitism of this host has not been verified.: 14916
Common names used historically to refer to P. cyphyus include clear profit and bullhead.