Tachyrhynchus lacteolus (P.P. Carpenter, 1864)
Turritella lagunillasensis (FOSSIL) Rivera, 1957 †
Turritella lahirii (FOSSIL) Cox, 1930 †
Turritella landbecki (FOSSIL) R.A. Philippi, 1887 †
Turritella larensis (FOSSIL) F. Hodson, 1926 †
Turritella latior K.H.J. Thiele, 1912
Omalaxis laudunensis (FOSSIL) (J.L.M. Defrance, 1828 †)
Zeacolpus lawsi (FOSSIL) J. Marwick, 1971 †
Turritella leeuwinensis (T.A. Garrard, 1972)
Turritella lentiginosa L.A. Reeve, 1849
Turritella leonensis (FOSSIL) T.A. Conrad, 1857 †
Incatella leptogramma (FOSSIL) (R.A. Philippi, 1887 †)
Turritella leucostoma A. Valenciennes, 1832
Turritella ligar G.P. Deshayes, 1843
Mesalia lincolnensis (FOSSIL) C.S. Weaver, 1916 †
Turritella lindae (E.J. Petuch, 1987)
Mariacolpus lindajoyceae (FOSSIL) E.J. Petuch, 2004 †
Turritella listrota (FOSSIL) W.P. Woodring, 1959 †
Turritella lloydsmithi (FOSSIL) H.A. Pilsbry & J. Brown,1917 †
Turritella lorenzana (FOSSIL) Wagner & Schilling,1923 †
Zeacolpus lornensis (FOSSIL) (J. Marwick, 1926 †)
Laxispira lumbricalis (FOSSIL) W.M. Gabb, 1877 †
Vermicularia lumbricalis (C. Linnaeus, 1758)
Zeacolpus luteolapis (FOSSIL) (J. Marwick, 1931 †)
Turritella lyonsi E.F. Garcia, 2006
Turritella machapoorensis (FOSSIL) C.J. Maury, 1925 †
Tropicolpus mackellari (FOSSIL) J. Marwick, 1971 †
Turritella maculata L.A. Reeve, 1849
Gazameda madagascariensis L. Bozzetti, 2008
Peyrotia magnasperula (FOSSIL) (F. Sacco, 1895 †)
Turritella magnasulcus (E.J. Petuch, 1991)
Torquesia mahmoudi (FOSSIL) Abbass, 1967 †
Broderiptella mansfieldi (FOSSIL) A.A. Olsson, 1967 †
Vermicularia maoriana A.W.B. Powell, 1937
Turritella mariana W.H. Dall, 1908