Pharaonella amanyu Kato & Ohsuga, 2017
Elliptotellina ambigua (FOSSIL) (Sowerby, 1823 †)
Psammotreta amboynensis (G.P. Deshayes, 1855)
Tellina americana (W.H. Dall, 1900)
Tellina amianta (W.H. Dall, 1900)
Tellina ampullacea R.A. Philippi, 1844
Tellina analogica G.B. III Sowerby, 1904
Miratellina anaxia (FOSSIL) W.P. Woodring, 1982 †
Tellina ancilla S.C.T. Hanley, 1844
Rexithaerus andersoni (FOSSIL) Clark, 1915 †
Tellina angrensis (R.C. Marques& L.R.L. Simone, 2014)
Nelltia angulata (FOSSIL) (W.M. Gabb, 1864 †)
Psammotreta angulata (C. Linnaeus, 1767)
Tellina angulosa (J.F. Gmelin, 1791)
Pseudomacalia antillarum (A.V.M.D. D'Orbigny,1853)
Tellina aquitanica (FOSSIL) C. Mayer, 1864 †
Tellina aquitanica burdigalica (FOSSIL) A.E.M. Cossmann& M.A. Peyrot, 1910 †
Tellina aragonia (FOSSIL) W.H. Dall, 1909 †
Psammacoma arctata (FOSSIL) (T.A. Conrad, 1849 †)
Tellina armata G.B. II Sowerby, 1868
Macoma arnheimi W.H. Dall
Jitlada arsinoensis (A. Issel, 1869)
Eurytellina arta (FOSSIL) (C.R. Laws, 1933 †)
Macoma asagaiensis (FOSSIL) J. Makiyama, 1934 †
Afsharius asmenus (J.C. Melvill & R. Standen,1907)
Tellina asperrima S.C.T. Hanley, 1844
Tellina assimilis S.C.T. Hanley, 1844
Asthenometis asthenodon (H.A. Pilsbry & H.N. Lowe,1932)
Macoma astori (FOSSIL) W.H. Dall, 1909 †
Tellina astrolabei (P. Dautzenberg& H. Fischer, 1912)
Tellina astula (C. Hedley, 1917)
Macoma atsunaiensis (FOSSIL) Honda, 1988 †
Tellina aurea G. Perry, 1811
Psammotreta aurora (S.C.T. Hanley, 1844)
Nitidotellina australiensis M. Huber, A. Langleit& K. Kreipl, 2015