- Unionidae, family Unionidae - freshwater mussels found worldwide
--1 is a kind of mollusk family
--1 is a member of
--1 has members:Bivalvia, class Bivalvia, Lamellibranchia, class Lamellibranchia, class Pelecypoda Unio, genus Unio; Anodonta, genus Anodonta; Dreissena, genus Dreissena