Paetulunio fabalis
Paetulunio fabalis, the rayed bean, is a species of freshwater mussel, an aquatic bivalve mollusk in the family Unionidae, the river mussels. It is the only species in the genus Paetulunio, and was formerly classified in Villosa until a 2018 study. Distribution and conservation status 

This species lives in eastern North America. It is native to the drainages of the Ohio River, the Tennessee River, and the Great Lakes. The Canadian Species at Risk Act listed it in the List of Wildlife Species at Risk as being endangered in Canada. References

Unionidae
Bivalves described in 1831
Taxobox binomials not recognized by IUCN