Poecilocoptis lagunillensis (H.A. Pilsbry, 1903)
Tetrentodon lajasensis C. de la Torre & P. Bartsch,1972
Torrecoptis lajoncheri (R. Arango, 1884)
Tenuistemma lateralis (Paz in L. Pfeiffer,1860)
Strophina laterradii (J.P.S. Grateloup, 1840)
Microceramus latus (J. Gundlachin L. Pfeiffer, 1863)
Ventricochis laureani C. de la Torre & P. Bartsch,1972
Microceramus laureanus C. de la Torre & P. Bartsch,1972
Tomelasmus lavalleanus (A.V.M.D. D'Orbigny,1842)
Nesocoptis leoni C. de la Torre & P. Bartsch,1972
Microceramus leptus C. de la Torre & P. Bartsch,1972
Tetrentodon lermondi C. de la Torre & P. Bartsch,1972
Brachypodella lescallei C. de la Torre & P. Bartsch,1972
Brachypodella leucopleura (K.T. Menke, 1847)
Coelostemma leucostoma F.G. Thompson, 1971
Anoma levis C.B. Adams, 1851
Brachypodella libanoensis C. de la Torre & P. Bartsch,1972
Coelostemma lichenophora (P. Bartsch, 1906)
Anisospira liebmanni (L. Pfeiffer, 1846)
Tetrentodon limonarensis C. de la Torre & P. Bartsch,1972
Macroceramus lineatus (J.G. Bruguière, 1789)
Gongylostoma lirata (Jimeno in L. Pfeiffer,1864)
Coelostemma lissocentrum H.A. Pilsbry, 1953
Poeycoptis lituus (A.A. Gould, 1842)
Torrecoptis livida (C. de la Torre, 1912)
Macroceramus loeryi E.R. Jacobson, 1955
Torrecoptis longa (H.A. Pilsbry& J. Henderson, 1913)
Johaniceramus longus (J. Henderson, 1915)
Gongylostoma lowei (C. de la Torre, 1927)
Pfeiffericoptis lucens (B.H. Wrightin G.B. Sowerby, 1875)
Cylindrella ludersi L. Pfeiffer, 1859
Macroceramus ludovici (L. Pfeiffer, 1853)
Hendersoniella lux F.G. Thompson& L.R. Correa-Sandoval, 1994
Pfeiffericoptis machoi (R. Arango, 1876)
Poecilocoptis macra (B.H. Wrightin L. Pfeiffer, 1867)