Ligumia subrostrata (T. Say, 1831) Nebraska, Falls City
Fusconaia subrotunda (I. Lea, 1831) Pennsylvania60,1 mm
Fusconaia subrotunda lesueuriana (I. Lea, 1840) Pennsylvania96 mm
Obovaria subrotunda (C.S. Rafinesque, 1820) Alabama30 mm
Radiatula substriata (I. Lea, 1856) Thailand, Tak
Ptychobranchus subtentum (T. Say, 1825) Alabama
Strophitus subvexus T.A. Conrad, 1834 Mississippi, Leake County
Lasmigona subviridis (T.A. Conrad, 1835) Pennsylvania
Amphinaias succissa (I. Lea, 1852) Alabama36 mm
Rectidens sumatrensis (R.W. Dunker, 1852) Indonesia, Sumatra
Unionelloides suni (FOSSIL) (Chow, 1953 †)
Physunio superbus (I. Lea, 1843) Western of Thailand62 mm
Rhombuniopsis superstes (M. von Neumayr, 1899) Yunnan, China
Nephronaias tabascoensis (J.G.F. de Charpentier in H.C. Küster, 1856) Mexico, Tabasco
Villosa taeniata (T.A. Conrad, 1829) Tennessee, Duck River81,5 mm
Pleurobema taitianum I. Lea, 1834 Alabama
Cyrtonaias tampicoensis (I. Lea, 1838) Mexico, Tamaulipas
Pseudospatha tanganyicensis (E.A. Smith, 1880) Lake Tanganyika
Sphenonaias taumilapana (T.A. Conrad, 1855) USA, Texas
Rhombuniopsis tauriformis (H.C. Fulton, 1906) Yunnan, China
Parreysia tavoyensis (A.A. Gould, 1843) Myanmar, Pegu
Saharella tedreftensis (FOSSIL) D. Mongin, 1963 † Niger70 mm
Popenaias tehuantepecensis (J.C.H. Crosse& P.H. Fischer, 1893) Honduras
Nephronaias tempisquensis H.A. Pilsbry, 1920 Costa Rica
Cristaria tenuis (E. Griffith& E. Pidgeon, 1833) Taiwan127 mm
Lampsilis teres C.S. Rafinesque, 1820 USA, Texas131 mm
Nitia teretiuscula (R.A. Philippi, 1847) Sudan, Nile river
Unio terminalis J.R. Bourguignat, 1852 Israel43 mm
Unio terminalis delicatus (I. Lea, 1863) Turkey, Amik lake52 mm
Uniomerus tetralasmus (T. Say, 1831) Alabama80,2 mm
Toxolasma texasiensis I. Lea, 1838 USA, Louisiana53,4 mm
Trapezoideus theca (W.H. Benson, 1862) Madhya Pradesh, India
Radiatula theobaldi H.B. Preston, 1912 India, Assam
Pseudodon thomsoni P.M.A. Morelet, 1884 Cambodia
Aculamprotula tientsinensis (J.C.H. Crosse& E.O. Debeaux, 1863) Poyang Lake, Jiangxi, China103 mm