Fissurella limbata Sowerby, 1835 Chile, Valparaiso37 mm
Diodora lincolnensis B.C. Cotton, 1930 South Australia32 mm
Emarginula lindonensis (FOSSIL) Hudleston † UK, Lincolnshire
Diodora lineata Sowerby, 1835 Australia, Sydney1937 mm
Diodora listeri d'Orbigny, 1842 Bahamas27 mm
Zeidora lodderae (R. Tate & W.L. May,1900)
Puncturella longifissa W.H. Dall, 1914
Fissurella longifissa G.B. II Sowerby, 1862 Ecuador25 mm
Emarginula macclurgi R.N. Kilburn, 1978 South Africa, Natal, Durban Bay6,9 mm
Fissurella macrotrema G.B. I Sowerby, 1835 USA, California
Emarginula maculata A. Adams, 1863 Philippines, Cebu14 mm
Macroschisma madreporaria C. Hedley, 1907
Cranopsis major (W.H. Dall, 1891) Aleutian Islands
Fissurellidea malleata (FOSSIL) R. Tate, 1882 † Australia, Victoria
Fissurisepta manawatawhia (A.W.B. Powell, 1937) New Zealand
Zeidora maoria A.W.B. Powell, 1937 New Zealand
Emarginula mareana (FOSSIL) N.E. Weisbord, 1962 † Venezuela, Monagas
Rimula mariei (J.B.P.A. Lamarck, 1816) Réunion7 mm
Diodora marshallensis (FOSSIL) H.S. Ladd, 1966 † Enewetak Atoll
Emarginula marylandica (FOSSIL) Martin, 1904 †
Fissuridea marylandica (FOSSIL) T.A. Conrad, 1841 †
Cosmetalepas massieri G.T. Poppe, S.P. Tagaro& J. Sarino, 2011 Namibia60,9 mm
Lucapina maullina J. Ramírez-Böhme, 1974
Parmaphorella mawsoni A.W.B. Powell, 1958 Weddell Sea13,7 mm
Fissurella maxima Sowerby, 1835 Chile, Coquimbo55,5 mm
Macroschisma maximum A. Adams, 1851
Fissurella mcleani (FOSSIL) DeVries, 2008 †
Fissurellidea megatrema (A.V.M.D. D'Orbigny,1839) Patagonia24,1 mm
Macroschisma megatrema A. Adams, 1851 Uruguay25 mm
Parmaphorella melvilli (K.H.J. Thiele, 1912) Falkland Islands16 mm
Medusafissurella melvilli (G.B. III Sowerby, 1882) Oman
Tauschia meneghiniana (FOSSIL) (Canavari, 1879 †) Italy, Umbria, Perugia
Diodora menkeana (R.W. Dunker, 1846) Gabon, Sao Tomé Island9 mm
Fissurella mesoatlantica L.R.L. Simone, 2008 Sao Pedro e Sao Paulo Archipelago14 mm
Diodora meta H.F.A. von Ihering, 1927 Florida17 mm