Tucetona lamyi (FOSSIL) (W.H. Dall, 1915 †)
Melaxinaea laticardo (FOSSIL) (Altena & Beets 1945) †
Tucetona laticostata (J.R.C. Quoy, 1835)
Glycymeris latiradiata (FOSSIL) (Gümbel, 1861 †)
Glycymeris latiradiata obova (FOSSIL) Baldi, 1962 †
Tucetona lenticularis (FOSSIL) (R. Tate, 1886 †)
Glycymeris lima (FOSSIL) d'Archaic & Haime, 1853 †
Glycymeris linda (FOSSIL) C.J. Maury, 1924 †
Glycymeris lintea A.A. Olsson, 1961
Glycymeris lisbonensis (FOSSIL) †
Tucetilla lisbonensis (FOSSIL) (Harris) †
Glycymeris livida L.A. Reeve, 1843
Glycymeris longior Sowerby, 1832
Glycymeris longioriformis (FOSSIL) del Rio, 1992 †
Tucetona lornensis (FOSSIL) (J. Marwick, 1923 †)
Glycymeris lowryi (FOSSIL) N.H. Ludbrook, 1978 †
Glycymeris lunulata (FOSSIL) (P. Nyst, 1836 †)
Glycymeris maccoyi (FOSSIL) (Johnston, 1880 †)
Glycymeris maculata W.J. Broderip, 1832
Glycymerita magna (FOSSIL) del Rio, 1992 †
Glycymeris mahiana (FOSSIL) J. Marwick, 1931 †
Glycymerita mainensis (FOSSIL) Devjatilova, 1981 †
Glycymeris major (FOSSIL) Stanton, 1896 †
Glycymeris manaiaensis (FOSSIL) (J. Marwick, 1923 †)
Glycymeris manitesta (FOSSIL) Berezovsky, 2015 †
Glycymeris marmorata (J.F. Gmelin, 1791)
Glycymeris marshalli (FOSSIL) C.R. Laws, 1930 †
Glycymeris martini Finlay, 1927
Glycymerita marwicki (FOSSIL) (A. Matsukuma& J. Grant-Mackie, 1979 †)
Tucetilla maudensis (A.C. Chapman& F.A. Singleton, 1925)
Glycymeris mayi B.C. Cotton, 1947
Africarca menkarai (FOSSIL) (Strougo 1979) †
Glycymeris microsulci (FOSSIL) B. Wade, 1926 †
Pseudoveletuceta mifunensis (FOSSIL) Tashiro, 1971 †
Tucetona mindoroensis (E.A. Smith, 1916)