Novastoa lamellosa (F.W. Hutton, 1873) New Zealand, Three Kings Islands
Petaloconchus lamellosus H.S. Ladd, 1972 New Zealand
Petaloconchus laurae D. Scuderi, 2012
Serpulorbis laxatus (FOSSIL) G.P. Deshayes, 1861 † France, Paris Basin
Dendropoma lebeche J. Templado, G. Richter& I.S. Calvo, 2016
Vermetus leognanensis (FOSSIL) A.E.M. Cossmann& M.A. Peyrot, 1922 † France, Aquitaine
Dendropoma leucozonias (O.A.L. Mörch, 1861)
Stephopoma levispinosum R. Bieler, 1997 West Panama
Serpulorbis libertina A.A. Gould, 1859
Thylacodes ligata (FOSSIL) A.E.M. Cossmann, 1923 † France, Aquitaine
Petaloconchus lilacinus (O.A.L. Mörch, 1862) Madagascar
Petaloconchus lilandikike D.P. Kelly, 2007
Dendropoma lituella (O.A.L. Mörch, 1861) USA, California69 mm
Serpulorbis llajasensis (FOSSIL) R.L. Squires, 1990 † USA, California, Ventura
Thylacodes longifilis O.A.L. Mörch, 1862 Japan, Kagoshima50 mm
Thylacodes lornensis (FOSSIL) (J. Marwick, 1926 †)
Dendropoma luchuanum (J.T. Kuroda, 1928) Okinawa
Petaloconchus macrophragma P.P. Carpenter, 1857 Galapagos
Serpulorbis major (FOSSIL) A.L. Chavan, 1937 † United States, Alabama, Clarke
Cupolaconcha maldivensis R.E. Golding, R. Bieler, T.A. Rawlings& T.M. Collins, 2014 Maldives Islands
Stephopoma mamillatum J.E. Morton & A.M. Keen,1960 Senegal, Goree Bay
Dendropoma marchadi A.M. Keen & J.E. Morton,1960
Thylacodes margaritaceus (C. Rousseau in J.C. Chenu, 1844) Ecuador
Thylacodes masier (G.P. Deshayes, 1843)
Ceraesignum maximum (G.B. I Sowerby, 1825) Philippines, Mactan Island204 mm
Petaloconchus mcgintyi (A.A. Olsson& A. Harbison, 1953) Netherlands Antilles, Aruba55 mm
Thylacodes medusae H.A. Pilsbry, 1891 Australia, Port Hedland109,9 mm
Thylacodes megalostomus O.A.L. Mörch, 1865
Dendropoma mejillonensis L. Pacheco & J. Laudien,2008 Chile, Peninsula Mejillones18 mm
Petaloconchus merkana H.S. Ladd, 1972
Cupolaconcha meroclista (J.A. Hadfield& E.A. Kay, 1972) Australia, Heron Island
Vermetus milleti (FOSSIL) G.P. Deshayes, 1839 † Spain, Malaga
Vermetus milleti pseudoturritella (FOSSIL) Boettger, 1906 † Hungary, Borsodbóta
Dendropoma mirabilis (J.E. Gray, 1831)
Petaloconchus montereyensis W.H. Dall, 1919 California, Redondo Beach