Unio (bivalve)

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 – extinct (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)