维基百科 Unio is a genus of medium-sized freshwater mussels, aquatic bivalve mollusks in the family Unionidae, the river mussels. Unio is the type genus of the family Unionidae. Species[edit] Species in the genus Unio include: Unio cariei - extinct [1] Unio crassus Philipsson, 1788 (Thick shelled river mussel) - near threatened Unio mancus Lamarck, 1819 Unio elongatulus C. Pfeiffer, 1825 Unio pictorum (Linnaeus, 1758) (Painter's mussel) Unio tumidus (Swollen river mussel) Unio turtoni Unio valentianus Rossm?ssler, 1854 References[edit] Jump up ^ Bouchet, P. & von Cosel, R. 1996. Unio cariei. 2006 IUCN Red List of Threatened Species. Downloaded on 7 August 2007.