Unio abbevillensis I. Lea, 1857
Lithodomina abbreviata (FOSSIL) L. Waagen, 1881 †
Cyprogenia aberti (T.A. Conrad, 1850)
Mujanaia abeuensis (FOSSIL) G. Delvene,M. Munt & al., 2016 †
Unio abrantesianus É.A.A. Locard, 1899
Lampsilis abrupta T. Say, 1831
Unio abyssinicus E.C. Von Martens, 1866
Lanceolaria acrorrhyncha (E.C. Von Martens, 1894)
Nitia acuminata (C.B. Adams, 1866)
Medionidus acutissimus (I. Lea, 1831)
Coelatura aegyptiaca (F. Cailliaud, 1827)
Coelatura aegyptiaca chudeaui J. Germain, 1906
Coelatura aegyptiaca juliani P.C.A.S.L. Rang, 1863
Coelatura aegyptiaca koehleri J. Germain, 1909
Coelatura aegyptiaca lacoini J. Germain, 1906
Coelatura aegyptiaca mandinguorum A. de Rochebrune, 1882
Pseudodon aeneolus H. Drouët & M.A. Chaper,1892
Nephronaias aeruginosa (P.M.A. Morelet, 1849)
Tuaregunio agadesensis (FOSSIL) (D. Mongin, 1963 †)
Elliptio ahenea I. Lea, 1843
Epioblasma ahlstedti J.W. Jones & R.J. Neves,2010
Potamilus alatus (T. Say, 1817)
Lepidodesma aligera (P.M. Heude, 1877)
Coelatura alluaudi (P. Dautzenberg, 1908)
Hamiota altilis (T.A. Conrad, 1834)
Pleurobema altum T.A. Conrad, 1854
Simpsoniconcha ambigua (T. Say, 1825)
Leptodea amphichaena L.S. Frierson, 1898
Villosa amygdala (I. Lea, 1843)
Anodonta anatina (C. Linnaeus, 1758)
Brazzaea anceyi J.R. Bourguignat, 1885
Unio andersoni (FOSSIL) Hudson, 1963 †
Radiatula andersoniana (G. Nevill, 1877)
Anemina angula (S. Tchang, K. Li& J.Y. Liu, 1965)
Gonidea angulata (I. Lea, 1838)