Marginella melvilli J.R. le B. Tomlin& L.J. Shackleford, 1913
Volvarina mendoncae J.A. Ortea, 2014
Cryptospira merguiensis L. Bozzetti, 2015
Demissa meridionalis F. Boyer, 2016
Volvarina mexicana F.P. Jousseaume, 1875
Volvarina micans (S.A.A. Petit De La Saussaye, 1851)
Marginella michelae T. Cossignani, 2012
Volvarina micros A.R.J.B. Bavay, 1922
Marginella millardi M. Lussi, 1993
Granulina minae J. Espinosa & J.A. Ortea,2000
Marginella mindiensis (FOSSIL) A.E.M. Cossmann, 1913 †
Prunum mingueloi J. Espinosa & J.A. Ortea,2013
Volvarina miniginella J. Espinosa, J.A. Ortea& L. Moro, 2010
Serrata minima F. Boyer, 2008
Granula minor (FOSSIL) (C.B. Adams, 1852 †)
Marginella minuscula W.H. Turton, 1932
Granulina minusculina (É.A.A. Locard, 1897)
Glabella mirabilis (H. Adams, 1869)
Marginella mirandai E. Rolán & S. Gori, 2014
Volvarina mitrella (A. Risso, 1826)
Hydroginella mixta (W.F. Petterd, 1884)
Volvarina mizrahiae J.A. Ortea, 2014
Mesoginella modulata (C.F. Laseron, 1957)
Granulina molinai J. Espinosa & J.A. Ortea,2006
Eratoidea mollitor (FOSSIL) W.H. Dall, 1915 †
Volvarina monchoi G.M. Caballer, J. Espinosa& J.A. Ortea, 2013
Marginella monicae L. Bozzetti, 1997
Volvarina monicae J.M. Díaz, J. Espinosa& J.A. Ortea, 1996
Volvarina monilis (C. Linnaeus, 1758)
Volvarina monilis terveriana (S.A.A. Petit De La Saussaye, 1851)
Granulina monjesensis T. McCleery, 2010
Marginella monozona W.H. Turton, 1932
Volvarina montenegroae J.A. Ortea, 2014
Dentimargo montrouzieri F. Boyer, 2003
Prunum montseae J. Espinosa, J.A. Ortea& L. Moro, 2014