Unio is a genus of medium-sized freshwater mussels, aquatic bivalve mollusks in the family Unionidae, the river mussels. They are found throughout Europe, Africa, and the Middle East, with some species introduced to East Asia. Fossil species are also known from the Jurassic of North America.
Unio is the type genus of the family Unionidae.
Species Species in the genus Unio include: Unio abyssinicus Martens, 1866 Unio bruguierianus Bourguignat, 1853 Unio caffer Krauss, 1848 Unio cariei – extinctBouchet, P. & von Cosel, R. 1996. Unio cariei. 2006 IUCN Red List of Threatened Species. Downloaded on 7 August 2007. (no longer recognised) Unio courtillieri Hattemann, 1859 Unio crassus Philipsson, 1788 (Thick shelled river mussel) - near threatened Unio damascensis Lea, 1863 Unio delicatus Lea, 1863 Unio delphinus Spengler, 1793 Unio dembeae Reeve, 1865 Unio durieui Deshayes, 1847 Unio elongatulus C. Pfeiffer, 1825 Unio eucirrus Bourguignat, 1857 Unio foucauldianus Pallary, 1936 Unio gibbus Spengler, 1793 Unio hueti Bourguignat, 1855 Unio ionicus Drouët, 1879 Unio mancus Lamarck, 1819 Unio meridionalis Drouët, 1883 Unio pictorum (Linnaeus, 1758) (Painter's mussel) Unio ravoisieri Deshayes, 1848 Unio sesirmensis Kobelt, 1913 Unio terminalis Bourguignat, 1852 Unio tigridis Bourguignat, 1852 Unio tumidiformis Castro, 1885 Unio tumidus Philipsson, 1788 (Swollen river mussel) Unio turtoni (=Unio mancus)
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