Unio abbevillensis I. Lea, 1857 Alabama155 mm
Lithodomina abbreviata (FOSSIL) L. Waagen, 1881 † Pakistan, Punjab, Sargodha
Cyprogenia aberti (T.A. Conrad, 1850) Kansas, Wilson County
Mujanaia abeuensis (FOSSIL) G. Delvene, M. Munt& al., 2016 † Spain, Asturias
Unio abrantesianus É.A.A. Locard, 1899 France, Angers
Lampsilis abrupta T. Say, 1831 Illinois
Unio abyssinicus E.C. Von Martens, 1866 Sudan, Nile river
Lanceolaria acrorrhyncha (E.C. Von Martens, 1894) Korea
Nitia acuminata (C.B. Adams, 1866) Uganda
Medionidus acutissimus (I. Lea, 1831) Georgia, Gordon County
Coelatura aegyptiaca (F. Cailliaud, 1827) Burkina Fasso, Ouagadougou45 mm
Coelatura aegyptiaca chudeaui J. Germain, 1906 Chad, Lake Chad42 mm
Coelatura aegyptiaca juliani P.C.A.S.L. Rang, 1863 Senegal, Dakar
Coelatura aegyptiaca koehleri J. Germain, 1909 Guinea Bissau
Coelatura aegyptiaca lacoini J. Germain, 1906 Chad, Lake Chad26,5 mm
Coelatura aegyptiaca mandinguorum A. de Rochebrune, 1882 Senegal, Dakar
Pseudodon aeneolus H. Drouët & M.A. Chaper,1892
Nephronaias aeruginosa (P.M.A. Morelet, 1849) Mexico, Yucatan
Tuaregunio agadesensis (FOSSIL) (D. Mongin, 1963 †) Niger68 mm
Elliptio ahenea I. Lea, 1843 Florida56 mm
Epioblasma ahlstedti J.W. Jones & R.J. Neves,2010 Tennessee45,8 mm
Potamilus alatus (T. Say, 1817) Alabama139,1 mm
Lepidodesma aligera (P.M. Heude, 1877) Poyang Lake, Jiangxi, China148,7 mm
Coelatura alluaudi (P. Dautzenberg, 1908) Lake Victoria
Hamiota altilis (T.A. Conrad, 1834) Tennessee, Chattanooga
Pleurobema altum T.A. Conrad, 1854 Alabama
Simpsoniconcha ambigua (T. Say, 1825) Ohio, Franklin County
Leptodea amphichaena L.S. Frierson, 1898 USA, Louisiana93,7 mm
Villosa amygdala (I. Lea, 1843) Florida36 mm
Anodonta anatina (C. Linnaeus, 1758) Belgium90 mm
Brazzaea anceyi J.R. Bourguignat, 1885 Lake Tanganyika23,3 mm
Unio andersoni (FOSSIL) Hudson, 1963 † UK, Scotland
Radiatula andersoniana (G. Nevill, 1877) Myanmar
Anemina angula (S. Tchang, K. Li& J.Y. Liu, 1965) China, Yangtze River
Gonidea angulata (I. Lea, 1838) California68 mm