Unio tigridis J.R. Bourguignat, 1852 Iraq
Aculamprotula tortuosa (I. Lea, 1865) Poyang Lake, Jiangxi, China81 mm
Epioblasma torulosa (C.S. Rafinesque, 1820) USA, Ohio
Epioblasma torulosa rangiana I. Lea, 1838 Pennsylvania
Villosa trabalis (T.A. Conrad, 1834) Tennessee, Stones River
Solenaia triangularis P.M. Heude, 1874 Poyang Lake, Jiangxi, China
Alasmidonta triangulata I. Lea, 1858 North Carolina, Raleigh
Lamprotula triclava (P.M. Heude, 1877) China, Yangtze River88 mm
Parreysia triembola W.H. Benson, 1855 India, Calcutta
Lanceolaria triformis (P.M. Heude, 1877) Poyang Lake, Jiangxi, China84 mm
Dysnomia triquetra (C.S. Rafinesque, 1820) Alabama51,4 mm
Acuticosta trisulcata (P.M. Heude, 1883) China, Kien-Te Hien39 mm
Acuticosta trisulcata triangula S. Tchang, K. Li& J.Y. Liu, 1965 China, JiuLong River25,3 mm
Elongaria trompi (H. Drouët& M.A. Chaper, 1892) Malaysia, Borneo
Truncilla truncata C.S. Rafinesque, 1820 Arkansas
Cristaria truncata V.N. Thanh,Thái & Pham, 1980 Vietnam, Tonkin
Palindonaia truncatosa (FOSSIL) (A. Michaud, 1837 †) France, Paris Basin
Anodonta truncilla (FOSSIL) J.D. Stilwell& Zinsmeister, 1992 †
Cyclonaias tuberculata (C.S. Rafinesque, 1820) Alabama77 mm
Pseudodon tumidus (P.M.A. Morelet, 1866) Cambodia
Unio tumidus A. Retzius, 1788 Hungary76 mm
Unio tumidus conus L. Spengler, 1793 Russia, Moscow64,4 mm
Dysnomia turgidula I. Lea, 1858 Tennessee
Lithodomina typa (FOSSIL) L. Waagen, 1881 † Pakistan, Punjab, Sargodha
Nyassunio ujijiensis (J.C.H. Crosse, 1881) Lake Tanganyika
Villosa umbrans (I. Lea, 1857) USA, Georgia
Cyrtonaias umbrosa (I. Lea, 1856) Mexico
Actinonaias undivaga (H.A. Pilsbry, 1910) Mexico, San Luis Potosì
Alasmidonta undulata (T. Say, 1817) Canada, Nova Scotia
Bisulcus undulatus (FOSSIL) E. Hitchcock, 1862 † USA, Massachusetts, Franklin
Strophitus undulatus (T. Say, 1817) Russia, Georgia85 mm
Obovaria unicolor I. Lea, 1845 Alabama35 mm
Lamellidens unioides H. Nesemann, S. Sharma, G. Sharma& al., 2007 India, Calcutta
Anemina ussuriensis Z.X. Qian,Y. Fang & He, 2015
Psorula usumasintae (J.C.H. Crosse& P.H. Fischer, 1892) Guatemala