• Mecutina Roewer, 1935
• Medasina Moore, 1887
• Medenina Rigby & Senowbari-Daryan, 1996 † (uncertain)
• Medina Bordoni, 1975 (uncertain) [Family: Staphylinidae]
• Medina Robineau-Desvoidy, 1830 [Family: Tachinidae]
• Medlinia P.A. Sims, 1998 †
• Medullina V.S. Maljavkina, 1949 †
• Medusia Verity, 1953 (uncertain)
• Medusina F.F. Chevallier, 1826 accepted as Hericium Persoon, 1794 [Family: Hericiaceae]
• Medusina Rueger-Haas in Rueger & Rueger-Haas, 1925 † (uncertain) [Family: Cnidaria (awaiting allocation)]
• Medusina Walcott, 1898 † (unaccepted) [Family: Cnidaria (awaiting allocation)]
• Medusulina J. Müller Arg., 1894
• Mehlina Youngquist, 1945 †
• Melina Chapuis in Lacordaire, 1874 accepted as Colaspoides Laporte, 1833 [Family: Chrysomelidae]
• Melina Chevrolat in Dejean, 1836 accepted as Melina Chapuis in Lacordaire, 1874 accepted as Colaspoides Laporte, 1833 [Family: Chrysomelidae]
• Melina Philipsson, 1788 accepted as Isognomon Lightfoot, 1786 [Family: Isognomonidae]
• Melina Robineau-Desvoidy, 1830 accepted as Pherbellia Robineau-Desvoidy, 1830 [Family: Sciomyzidae]
• Melusina Haeckel, 1880 (uncertain) [Family: Cnidaria (awaiting allocation)]
• Melusina Meigen, 1800 (unaccepted) [Family: Simuliidae]
• Melusina Stål, 1867 (unaccepted) [Family: Hemiptera (awaiting allocation)]
• Merelina Iredale, 1915
• Merulina Ehrenberg, 1834
• Mesalina Gray, 1838
• Morulina Börner, 1906 [Family: Hypogastruridae]
• Morulina Dall, 1923 accepted as Morula Schumacher, 1817 [Family: Muricidae]
• Mulina Philippi, 1853 accepted as Mulinia Gray, 1837