Engina macleani A.A. Olsson, 1971
Paracominia macphersoni (FOSSIL) (J. Marwick, 1931 †)
Solenosteira macrospira S.S. Berry, 1957
Penion macsporrani (FOSSIL) (R.A. Philippi, 1887 †)
Cominella maculosa (T. Martyn, 1784)
Buccinum maculosum J. Lightfoot, 1786
Buccinum maehirai R. Tiba, 1980
Solenosteira magdalenensis (FOSSIL) N.E. Weisbord, 1929 †
Pareuthria magellanica (R.A. Philippi, 1848)
Antistreptus magellanicus W.H. Dall, 1902
Neptunea magnanimita K. Fraussen & Y. Terryn,2007
Engina magnifica K. Fraussen, E. Monnier& J. Rosado, 2015
Austrofusus magnificus (FOSSIL) C.C. Finlay, 1926 †
Crassicantharus magnificus K. Fraussen& P. Stahlschmidt, 2015
Clinopegma magnum (W.H. Dall, 1895)
Clinopegma magnum damon (W.H. Dall, 1907)
Clinopegma magnum unicum (H.A. Pilsbry, 1905)
Clinopegma magnum uritai J.T. Kuroda, 1931
Manaria makassarensis P. Bouchet & A. Warén,1986
Beringius malleatus (W.H. Dall, 1884)
Buccinum maltzani G.J. Pfeffer, 1886
Jerrybuccinum malvinense Y.I. Kantor & G. Pastorino,2009
Chauvetia mamillata (A. Risso, 1826)
Engina mandarinoides K. Fraussen & M. Chino,2011
Penion mandarinus (P.L. Duclos, 1851)
Engina mantensis P. Bartsch, 1928
Buccinulum mariae A.W.B. Powell, 1940
Eosiphonalia mariae (FOSSIL) (Melleville, 1843 †)
Euthria marianae E. Rolán, A. Monteiro& K. Fraussen, 2003
Pisania mariavictoriae (FOSSIL) Brunetti & Della Bella,2016 †
Lussivolutopsius marinae Y.I. Kantor, 1984
Chauvetia maroccana S. Gofas & P.G. Oliver,2010
Beringius marshalli W.H. Dall, 1919
Aeneator marshalli (R. Murdoch, 1924)
Aeneator marshalli separabilis R.K. Dell, 1956