Friersonia iridella (H.A. Pilsbry& L.S. Frierson, 1907)
Solenaia iridinea (P.M. Heude, 1874)
Villosa iris (I. Lea, 1829)
Pronodularia japanensis (I. Lea, 1859)
Elliptio jayensis I. Lea, 1838
Elliptio jayensis buckleyi I. Lea, 1843
Lamellidens jenkinsianus (W.H. Benson, 1862)
Acuticosta jianghanensis J. He & Z. Zhuang, 2013
Anodonta johnseni (FOSSIL) H.D. Russell, 1935 †
Inversiunio jokohamensis (H.F.A. von Ihering,1893)
Ptychobranchus jonesi (H. Van Der Schalie,1934)
Oxynaia jourdyi (L.J. Morlet, 1886)
Oxynaia jourdyi corrugata (P. Dautzenberg& H. Fischer, 1905)
Oxynaia jourdyi ponderosa (P. Dautzenberg& H. Fischer, 1905)
Unio jowikolensis (FOSSIL) Cox, 1955 †
Elliptio judithae A.H. Clarke, 1986
Unio katzeri (FOSSIL) Š. Brusina, 1904 †
Amphinaias keineriana (I. Lea, 1852)
Anodonta kennerlyi I. Lea, 1860
Radiatula khadakvaslaensis H.C. Ray, 1966
Solenaia khwaenoiensis S. Panha & Deein, 2004
Coelatura kipopoensis G. Mandahl-Barth, 1968
Unio kirchbergensis (FOSSIL) Krauss, 1852 †
Lamprotula kouangensis (C.T. Simpson, 1900)
Coelatura kunenensis (A. Mousson, 1887)
Psoronaias kuxensis L.S. Frierson, 1917
Unio lacaziana (FOSSIL) D. Dupuy, 1843 †
Pyganodon lacustris (I. Lea, 1852)
Lamellidens lamellatus (I. Lea, 1838)
Schistodesmus lampreyanus (W. Baird & A. Adams,1867)
Fusconaia lananensis L.S. Frierson, 1901
Elliptio lanceolata I. Lea, 1827
Arconaia lanceolata (I. Lea, 1856)
Lepidodesma languilati (P.M. Heude, 1874)
Rostrunio lapparenti (FOSSIL) (D. Mongin, 1963 †)