Tropidophora ligata (O.F. Müller, 1774)
Tropidophora ligatula (J.P.S. Grateloup, 1840)
Annularia lima (C.B. Adams, 1843)
Eutudora limbifera (K.T. Menke in L. Pfeiffer,1846)
Eutudora limbifera ternata (L.A. Reeve, 1863)
Limadorex limonensis (C. de la Torre& P. Bartsch, 1941)
Annularia lincina (C. Linnaeus, 1758)
Tropidophora lincolni K.C. Emberton, 2009
Chondropoma lindenianum C.D. Weinland, 1880
Tropidophora lineata L. Pfeiffer
Bermudezia lirata (C. de la Torre& P. Bartsch, 1941)
Lithidion lithidion (G.B. Sowerby, 1843)
Opisthosiphon litorale C. de la Torre & P. Bartsch,1941
Chondropoma litteratum L. Pfeiffer, 1852
Adamsiella longicollis L. Pfeiffer, 1855
Tropidophora macarae S.A.A. Petit De La Saussaye,1853
Tropidophora macareae (S.A.A. Petit De La Saussaye, 1853)
Annularisca mackinlayi (J. Gundlachin L. Pfeiffer, 1859)
Tudora maculata H.B. Baker, 1924
Hendersonina maculata C. de la Torre & P. Bartsch,1938
Chondropoma magnificum (L. Pfeiffer, 1852)
Chondropometes magnum C. de la Torre & P. Bartsch,1938
Chondropometes magnum elisabethae C. de la Torre & P. Bartsch,1938
Chondropometes magnum signae C. de la Torre & P. Bartsch,1938
Tropidophora maignei E. Fischer-Piette, Ch.P. Blanc, F. Blanc& F. Salvat, 1994
Annularita majuscula (P.M.A. Morelet, 1851)
Leonia mammillaris (J.B.P.A. Lamarck, 1822)
Leonia mammillaris compacta (P.M. Pallary, 1927)
Leonia mammillaris turricula (P.M. Pallary, 1920)
Opisthosiphon manatiense C. de la Torre & P. Bartsch,1941
Chondropoma manielensis (P. Bartsch, 1946)
Chondropoma marginalbum (J. Gundlachin L. Pfeiffer, 1859)
Chondropoma mariguanicolum P. Bartsch, 1946
Parachondria maritima (C.B. Adams, 1846)
Parachondria maritima aurora (C.B. Adams, 1846)