Tritonoturris macandrewi (E.A. Smith, 1882) Philippines, Cebu9,2 mm
Lusitanops macrapex P. Bouchet & A. Warén,1980 Azores
Raphitoma maculosa T. Høisæter, 2016
Daphnella magnifica P. Stahlschmidt, G.T. Poppe& M. Chino, 2014 Philippines, Mactan Island10,5 mm
Pleurotomella maitasi W. Engl, 2008 Antarctica
Phymorhynchus major A. Warén & P. Bouchet,2001 East Pacific Rise 13N
Xanthodaphne maldivica A.V. Sysoev, 1996 Maldives Islands
Hemilienardia malleti (C.A. Récluz, 1852) Philippines, Mactan Island5 mm
Mioawateria malmii (W.H. Dall, 1889) Cuba5 mm
Xanthodaphne maoria R.K. Dell, 1956 New Zealand
Daphnella margaretae W.G. Lyons, 1972 Brazil, Rio Grande do Norte62 mm
Daphnella marmorata R.B. Hinds, 1844 Queensland
Nepotilla marmorata (J.C. Verco, 1909)
Pleurotomella marshalli (E.R. Sykes, 1906) Europe
Pseudodaphnella martensi (G. Nevill & H. Nevill,1875)
Buccinaria martini (E.J. Koperberg, 1931) Philippines, Aliguay Island34,7 mm
Leiosyrinx matsukumai P. Bouchet & A.V. Sysoev,2001 China, Zhejiang40 mm
Paramontana mayana (C. Hedley, 1922) Australia, Victoria
Taranis mayi (J.C. Verco, 1909) South Australia
Daphnella mazatlanica H.A. Pilsbry & H.N. Lowe,1932 Ecuador9 mm
Eubela mcgintyi J.S. Schwengel, 1943 Caribbean
Azorilla megalembryon (P. Dautzenberg& H. Fischer, 1896) Europe
Kermia melanoxytum (R.P.J. Hervier, 1896) Philippines, Mactan Island4 mm
Xanthodaphne membranacea (R.B. Watson, 1886) New Zealand
Tritonoturris menecharmes (J.C. Melvill, 1923) Philippines, Camotes Island23 mm
Pleurotomella meriacum É.A.A. Locard, 1896 Panama East9,1 mm
Daphnella metcalfiana (L.A. Reeve, 1845)
Thesbia michaelseni (H. Strebel, 1905) Argentina, Tierra del Fuego6 mm
Raphitoma michaudi (FOSSIL) (L.M.D. Bellardi, 1877 †) Italy, Emilia
Gymnobela micraulax A.V. Sysoev, 1997 Indonesia, Tanimbar Islands26,5 mm
Hemilienardia micronesialba Wiedrick, 2017
Nepotilla microscopica (W.L. May, 1916) Tasmania
Gymnobela midpacifica P. Stahlschmidt& M. Chino, 2012 Midway Islands25,5 mm
Hemilienardia mikesevernsi Wiedrick, 2017
Daphnella millegrana A. Garrett, 1873 Fiji Islands11 mm