Oenopota mitrula (S.L. Lovén, 1846) Arctic
Anticlinura monochorda (W.H. Dall, 1908) West America
Eucithara monochoria C. Hedley, 1922 Philippines, Butuan6,1 mm
Saccharoturris monocingulata (W.H. Dall, 1889) Barbados5 mm
Propebela monterealis (W.H. Dall, 1919) America
Eucithara moraria C. Hedley, 1922 Queensland
Oenopota morchi (W. Leche, 1878) Alaska
Antiguraleus morgana (K.H. Barnard, 1958)
Neoguraleus morgani (FOSSIL) (J. Marwick, 1924 †)
Sorgenfreispira moronii (FOSSIL) (Venzo & Pelosio, 1964 †)
Anticlinura movilla (W.H. Dall, 1908) West America
Mangelia muiri K.H. Barnard, 1958
Brachycythara multicincta E. Rolán & J. Espinosa,1999 USA, Louisiana
Oenopota multicostata (T.A. Verkrüzen, 1878)
Vitjazinella multicostata A.V. Sysoev, 1988 Izu-Bonin Trench, NW Pacific7,2 mm
Pseudorhaphitoma multigranosa (M.M. Schepman, 1913) Madagascar
Tenaturris multilineata (C.B. Adams, 1845)
Mangelia multilineolata (G.P. Deshayes, 1835) Italy, Siracusa7,4 mm
Antiguraleus multistriatus R.K. Dell, 1956 New Zealand
Mangelia munda (E.A. Smith, 1888)
Antiguraleus mundus (H.H. Suter, 1909) New Zealand
Mangelia munivakensis W.H. Dall, 1919
Neoguraleus murdochi (H.J. Finlay, 1924) New Zealand, North Island7,5 mm
Oenopota murdochiana (W.H. Dall, 1885) Arctic
Ithycythara muricoides (C.B. Adams, 1850) Caribbean
Antiguraleus murrheus (W.H. Webster, 1906) New Zealand
Leiocithara musae (K.H.J. Thiele, 1925) South Africa, Natal4,2 mm
Mangelia myrmecodes J.C. Melvill& R. Standen, 1901
Pseudorhaphitoma naganumaensis Y. Otuka, 1935 Japan, Noto Peninsula
Pseudorhaphitoma nakosiensis (FOSSIL) S. Nomura & N. Zinbo,1936 † Okinawa
Eucithara nana (L.A. Reeve, 1846) Philippines
Brachycythara nanodes (J.C. Melvill, 1923)
Guraleus nanus C.F. Laseron, 1954 New South Wales
Bela nassoides J. Gardner, 1938 Florida, Alum Bluff formation
Mangelia neapolitana S. Delle Chiaje, 1841