Ischnochiton lentiginosus (G.B. II Sowerby, 1840) Australia, Port Jackson
Ischnochiton ligusticus (FOSSIL) Dell'Angelo & al., 2013 † Italy
Stenoplax limaciformis (G.B. I Sowerby in W.J. Broderip& G.B. I Sowerby, 1832) Mexico, Baja California31,3 mm
Tripoplax lindbergi (A.M. Jakovleva, 1952) Kurile islands
Stenoplax lindholmii (L. von Schrenck, 1862)
Ischnochiton lineolatus (H.M.D. de Blainville,1825) Australia, Kangaroo Island
Cymatochiton loftusianus (FOSSIL) (King, 1848 †) UK, England, Tyne and Wear
Stenochiton longicymba (H.M.D. de Blainville, 1825 ex Dufresne MS) South Australia38,9 mm
Ischnochiton lopesi P. Kaas, 1974 Brazil
Ischnochiton luteoroseus H.H. Suter, 1907 Tasmania
Ischnochiton luticolens A.F.B. Hull, 1923 Australia, Broome
Lepidozona luzonica (G.B. II Sowerby, 1842) Red Sea
Lepidozona lycurgus W.H. Dall, 1919
Ischnochiton macleani A. Ferreira, 1978 Ecuador
Stenoplax magdalenensis (R.B. Hinds, 1845) Mexico, Baja California65 mm
Ischnochiton manazuruensis Owada, 2016
Ischnochiton maorianus T. Iredale, 1914 New Zealand, Auckland32,4 mm
Stenoplax marcusi (G. Righi, 1971) Brazil, Pernambuco11 mm
Haploplax mariae (J.N. Milne, 1958)
Stenoplax mariposa (W.H. Dall, 1919) Mexico, Baja California15 mm
Ischnochiton marloffsteinensis (FOSSIL) Fiedel & Keupp, 1988 † Germany, Bayern, Forchheim
Ischnochiton martinelli (FOSSIL) Angelo & al., 2004 † Italy, Sicily, Altavilla
Ischnochiton mawlei T. Iredale & W.L. May,1916 Tasmania
Ischnochiton mayi H.A. Pilsbry, 1895 Tasmania
Lepidozona mertensii (A.T. von Middendorff,1847) California, Monterey Bay36 mm
Stenosemus merveae B.I. Sirenko, 2016
Stenosemus mexicanus (P. Kaas, 1993)
Particulazona milnei P. Kaas, 1993
Ischnochiton mitsukurii H.A. Pilsbry, 1898 Japan
Connexochiton moreirai (G. Righi, 1973) Brazil, Guarapari
Ischnochiton morishimai Is. Taki, 1962
Stenosemus moskalevi B.I. Sirenko, 2016
Lepidozona multigranosa B.I. Sirenko, 1975
Ischnochiton muscarius (L.A. Reeve, 1847) Mexico, Mazatlan13 mm
Ischnochiton newcombi P.P. Carpenter in H.A. Pilsbry, 1892