• Mytilus (Aulacomya) diluculum Mörch, 1874 accepted as Aulacomya atra (Molina, 1782)
• Mytilus (Aulacomya) magellanicus accepted as Aulacomya atra (Molina, 1782)
• Mytilus (Aulacomya) willetsi Marwick, 1928 † accepted as Brachidontes willetsi (Marwick, 1928) †
• Mytilus (Crassimytilus) coruscus A. Gould, 1861 accepted as Mytilus coruscus A. Gould, 1861
• Mytilus (Dacrydium) hyalinus Monterosato, 1875 accepted as Dacrydium hyalinum (Monterosato, 1875)
• Mytilus (Hormomya) puntarenensis Pilsbry & H. N. Lowe, 1932 accepted as Brachidontes puntarenensis (Pilsbry & H. N. Lowe, 1932)
• Mytilus (Modiola) areolatus A. Gould, 1850 accepted as Modiolus areolatus (A. Gould, 1850)
• Mytilus (Modiola) chenui Récluz, 1842 accepted as Gregariella chenui (Récluz, 1842)
• Mytilus (Modiola) flabellatus A. Gould, 1850 accepted as Mytilus flabellatus A. Gould, 1850 accepted as Modiolus rectus Conrad, 1837
• Mytilus (Modiola) hepaticus A. Gould, 1850 accepted as Mytilus hepaticus A. Gould, 1850 accepted as Modiolus auriculatus Krauss, 1848
• Mytilus (Modiola) leckenbii J. Morris & Lycett, 1855 † (uncertain > unassessed)
• Mytilus (Modiola) pallasi Verneuil, 1845 † accepted as Verneuilnodon pallasi (Verneuil, 1845) †
• Mytilus (Modiola) teplofi Verneuil, 1845 † (uncertain > taxon inquirendum)
• Mytilus (Modiola) ziczac Anton, 1838 accepted as Musculus impactus (Hermann, 1782)
• Mytilus (Modiolarca) coenobita Vaillant, 1865 accepted as Musculus coenobitus (Vaillant, 1865)
• Mytilus (Mytilus) caroniensis Maury, 1925 † represented as Mytilus caroniensis Maury, 1925 †
• Mytilus (Mytilus) edulis Linnaeus, 1758 represented as Mytilus edulis Linnaeus, 1758
• Mytilus (Mytilus) fuscus M. Hörnes, 1867 † accepted as Mytilus fuscus M. Hörnes, 1867 †
• Mytilus (Mytilus) incertus Sacco, 1898 † (uncertain > unassessed)
• Mytilus (Plicatomytilus) allisoni (Kafanov, 1986) † represented as Mytilus allisoni (Kafanov, 1986) †
• Mytilus (Plicatomytilus) gratacapi Allison & Addicott, 1976 † represented as Mytilus gratacapi Allison & Addicott, 1976 †
• Mytilus (Plicatomytilus) middendorffi Grewingk, 1850 † represented as Mytilus middendorffi Grewingk, 1850 †
• Mytilus (Praemytilus) strathairdensis F. W. Anderson & L. R. Cox, 1948 † accepted as Praemytilus strathairdensis (F. W. Anderson & L. R. Cox, 1948) †
• Mytilus (Septifer) lingua K. Martin, 1879 † accepted as Septifer lingua (K. Martin, 1879) †
• Mytilus (Septifer) superbus M. Hörnes, 1867 † (uncertain > unassessed)
• Mytilus (Tumidimytilus) addicottii Kafanov, 1986 † represented as Mytilus addicottii Kafanov, 1986 †
• Mytilus abbreviatus Lamarck, 1819 accepted as Mytilus edulis Linnaeus, 1758
• Mytilus abbreviatus Thurmann, 1863 † (uncertain > unassessed)
• Mytilus achatinus Lamarck, 1819 accepted as Choromytilus chorus (Molina, 1782)
• Mytilus acutangulus Deshayes, 1830 † accepted as Admytilus acutangulus (Deshayes, 1830) †
• Mytilus acutirostris Dunker, 1849 † (uncertain > unassessed)
• Mytilus acutirostris Goldfuss, 1837 † accepted as Coelogonia brardii (Brongniart, 1823) †
• Mytilus adamsianus Dunker, 1857 accepted as Brachidontes adamsianus (Dunker, 1857)
• Mytilus addicottii Kafanov, 1986 †
• Mytilus adjunctus Barrande, 1881 † (uncertain > unassessed)
• Mytilus afer Gmelin, 1791 accepted as Perna perna (Linnaeus, 1758)
• Mytilus affinis J. De C. Sowerby, 1826 † (uncertain > unassessed)
• Mytilus africanus Chemnitz, 1785 accepted as Perna perna (Linnaeus, 1758)
• Mytilus africanus Fischer von Waldheim, 1807 accepted as Perna perna (Linnaeus, 1758)
• Mytilus alacorvi Dillwyn, 1817 accepted as Electroma alacorvi (Dillwyn, 1817)
• Mytilus alaeformis J. Sowerby, 1821 † (uncertain > unassessed)
• Mytilus albus Molina, 1782 accepted as Choromytilus chorus (Molina, 1782)
• Mytilus algosus Gould, 1850 accepted as Semimytilus algosus (Gould, 1850) accepted as Semimytilus patagonicus (Hanley, 1843)
• Mytilus allisoni (Kafanov, 1986) †
• Mytilus almerae Carez, 1881 † (uncertain > unassessed)
• Mytilus alternatus A. d'Orbigny, 1844 † (uncertain > unassessed)
• Mytilus ambiguus Dillwyn, 1817 accepted as Rocellaria dubia (Pennant, 1777)
• Mytilus americanus A. d'Orbigny, 1846 accepted as Aulacomya atra (Molina, 1782)
• Mytilus americanus Reeve, 1858 accepted as Mytilopsis leucophaeata (Conrad, 1831)
• Mytilus ampelitaecola de Ryckholt, 1851 † accepted as Naiadites triangularis (J. De C. Sowerby, 1840) †
• Mytilus amplus J. Sowerby, 1812 † accepted as Stegoconcha ampla (J. Sowerby, 1812) †
• Mytilus anatinus Linnaeus, 1758 accepted as Anodonta anatina (Linnaeus, 1758)
• Mytilus andersoni E. von Martens, 1887 accepted as Ciboticola andersoni (E. von Martens, 1887)
• Mytilus andrei Munier-Chalmas, 1881 † (uncertain > unassessed)
• Mytilus angulatus W. Williamson, 1834 accepted as Mytilus edulis Linnaeus, 1758
• Mytilus angustanus Lamarck, 1819 accepted as Mytilus planulatus Lamarck, 1819
• Mytilus angustanus Lamarck, 1819 sensu Reeve, 1858 accepted as Semimytilus algosus (Gould, 1850) accepted as Semimytilus patagonicus (Hanley, 1843)
• Mytilus angustus Münster, 1837 † (uncertain > unassessed)
• Mytilus angustus Rousseau, 1842 † accepted as Dreissena (Dreissena) angusta (Rousseau, 1842) † represented as Dreissena angusta (Rousseau, 1842) †
• Mytilus antiquorum J. Sowerby, 1821 † (uncertain > unassessed)
• Mytilus antiquus Goldfuss, 1837 † (uncertain > unassessed)
• Mytilus antonii P. Oppenheim, 1903 †
• Mytilus aoteanus A. W. B. Powell, 1958 accepted as Mytilus planulatus Lamarck, 1819
• Mytilus apertus Deshayes, 1838 † accepted as Sinucongeria aperta (Deshayes, 1838) †
• Mytilus apicicrassus de Ryckholt, 1851 † (uncertain > unassessed)
• Mytilus arabicus (Jousseaume, 1919) accepted as Brachidontes pharaonis (P. Fischer, 1870)
• Mytilus araucanus A. d'Orbigny, 1846 † (uncertain > unassessed)
• Mytilus arborescens Chemnitz, 1795 accepted as Mytilus arborescens Fischer von Waldheim, 1807 accepted as Amygdalum arborescens (Fischer von Waldheim, 1807)
• Mytilus arborescens Fischer von Waldheim, 1807 accepted as Amygdalum arborescens (Fischer von Waldheim, 1807)
• Mytilus arca Kickx, 1834 accepted as Dreissena polymorpha (Pallas, 1771)
• Mytilus arcuatus Clessin, 1887 accepted as Brachidontes granulatus (Hanley, 1843)
• Mytilus arealis Menke, 1830 accepted as Musculus lateralis (Say, 1822)
• Mytilus areolatus A. Gould, 1850 accepted as Modiolus areolatus (A. Gould, 1850)
• Mytilus aristatus Dillwyn, 1817 accepted as Leiosolenus aristatus (Dillwyn, 1817)
• Mytilus armoricensis Cossmann, 1905 † accepted as Brachidontes armoricensis (Cossmann, 1905) †
• Mytilus astartinus Thurmann, 1863 † (uncertain > unassessed)
• Mytilus ater Molina, 1782 accepted as Aulacomya atra (Molina, 1782)
• Mytilus ater Zelebor, 1866 accepted as Xenostrobus neozelanicus (Iredale, 1915)
• Mytilus atratus Lischke, 1871 accepted as Vignadula atrata (Lischke, 1871)
• Mytilus atropurpureus Dunker, 1857 accepted as Brachidontes niger (Gmelin, 1791)
• Mytilus auratus Molina, 1810 (uncertain > nomen dubium)
• Mytilus avicular Holten, 1802 accepted as Pteria avicular (Holten, 1802)
• Mytilus avonensis Montagu, 1803 accepted as Anodonta anatina (Linnaeus, 1758)
• Mytilus baldi Brusina, 1865 accepted as Mytilaster lineatus (Gmelin, 1791)
• Mytilus barbatus Linnaeus, 1758 accepted as Modiolus barbatus (Linnaeus, 1758)
• Mytilus basteroti Deshayes, 1836 † accepted as Andrusoviconcha basteroti (Deshayes, 1836) †
• Mytilus beirensis Sharpe, 1850 † accepted as Regulifer beirensis (Sharpe, 1850) †
• Mytilus biceps Menke, 1848 accepted as Brachidontes exustus (Linnaeus, 1758)
• Mytilus bicolor Bruguière, 1792 accepted as Mytella bicolor (Bruguière, 1792) accepted as Mytella guyanensis (Lamarck, 1819)
• Mytilus bidens Linnaeus, 1767 (uncertain > nomen dubium)
• Mytilus bifurcatus Conrad, 1837 accepted as Mytilisepta bifurcata (Conrad, 1837)
• Mytilus bilocularis Linnaeus, 1758 accepted as Septifer bilocularis (Linnaeus, 1758)
• Mytilus binfieldi J. Morris & Lycett, 1853 † accepted as Modiolus imbricatus (J. Sowerby, 1818) †
• Mytilus biochii Deshayes, 1866 † accepted as Brachidontes biochii (Deshayes, 1866) †
• Mytilus blandus de Loriol, 1872 † (uncertain > unassessed)
• Mytilus blondeli Monterosato, 1872 accepted as Mytilaster minimus (Poli, 1795)
• Mytilus boeckii Mörch, 1874 accepted as Brachidontes granulatus (Hanley, 1843)
• Mytilus boloniensis de Loriol, 1866 † (uncertain > unassessed)
• Mytilus borealis Lamarck, 1819 accepted as Mytilus edulis Linnaeus, 1758
• Mytilus brardii Brongniart, 1823 † accepted as Coelogonia brardii (Brongniart, 1823) †