Engina macleani A.A. Olsson, 1971
Paracominia macphersoni (FOSSIL) (J. Marwick, 1931 †)
Solenosteira macrospira S.S. Berry, 1957 Mexico, Guaymas Sonora38,5 mm
Penion macsporrani (FOSSIL) (R.A. Philippi, 1887 †) Chile, Navidad Formation46 mm
Cominella maculosa (T. Martyn, 1784) New Zealand, Auckland37 mm
Buccinum maculosum J. Lightfoot, 1786
Buccinum maehirai R. Tiba, 1980 Japan, Hokkaido71 mm
Solenosteira magdalenensis (FOSSIL) N.E. Weisbord, 1929 † Venezuela
Pareuthria magellanica (R.A. Philippi, 1848) Argentina, Tierra del Fuego34 mm
Antistreptus magellanicus W.H. Dall, 1902 Magellan Strait4,7 mm
Neptunea magnanimita K. Fraussen & Y. Terryn,2007
Engina magnifica K. Fraussen, E. Monnier& J. Rosado, 2015 Mozambique, Cabo Correntes10,3 mm
Austrofusus magnificus (FOSSIL) C.C. Finlay, 1926 †
Crassicantharus magnificus K. Fraussen& P. Stahlschmidt, 2015
Clinopegma magnum (W.H. Dall, 1895) Kamchatka132,6 mm
Clinopegma magnum damon (W.H. Dall, 1907) Japan, Hokkaido87,1 mm
Clinopegma magnum unicum (H.A. Pilsbry, 1905) Japan, Hokkaido70 mm
Clinopegma magnum uritai J.T. Kuroda, 1931 Russia, Okhotsk Sea74 mm
Manaria makassarensis P. Bouchet & A. Warén,1986 Indonesia, Makassar Strait32,8 mm
Beringius malleatus (W.H. Dall, 1884) Alaska, Point Barrow
Buccinum maltzani G.J. Pfeffer, 1886 Canada, Newfoundland35 mm
Jerrybuccinum malvinense Y.I. Kantor& G. Pastorino, 2009 Falkland Islands20 mm
Chauvetia mamillata (A. Risso, 1826) Italy, Scilla, Calabria7 mm
Engina mandarinoides K. Fraussen & M. Chino,2011 Philippines, Surigao7,2 mm
Penion mandarinus (P.L. Duclos, 1851) Australia, Port Phillip Bay133 mm
Engina mantensis P. Bartsch, 1928 Ecuador22,6 mm
Buccinulum mariae A.W.B. Powell, 1940 New Zealand20 mm
Eosiphonalia mariae (FOSSIL) (Melleville, 1843 †) France, Paris Basin
Euthria marianae E. Rolán, A. Monteiro& K. Fraussen, 2003 Cape Verde
Pisania mariavictoriae (FOSSIL) Brunetti & Della Bella,2016 †
Lussivolutopsius marinae Y.I. Kantor, 1984 Ochotsk Sea100 mm
Chauvetia maroccana S. Gofas & P.G. Oliver,2010
Beringius marshalli W.H. Dall, 1919 Japan, Hokkaido139 mm
Aeneator marshalli (R. Murdoch, 1924) New Zealand, Auckland53 mm
Aeneator marshalli separabilis R.K. Dell, 1956 New Zealand, Hauraki Gulf