synonym of Callistoctopus luteus (Sasaki, 1929) – starry night octopus Octopus macropodus Sangiovanni, 1829: synonym of Callistoctopus macropus (Risso, 1826) Octopus macropus Risso, 1826: synonym of Callistoctopus macropus (Risso, 1826) – Atlantic white-spotted octopus Octopus maculatus Rafinesque, 1814: synonym of Octopus vulgaris Cuvier, 1797 Octopus maculosus Hoyle, 1883: synonym of Hapalochlaena maculosa (Hoyle, 1883) Octopus magnificus Villanueva, Sanchez & Compagno, 1992: synonym of Enteroctopus magnificus (Villanueva, Sanchez & Compagno, 1992) Octopus maorum Hutton, 1880: synonym of Macroctopus maorum (Hutton, 1880) – Maori octopus Octopus marginatus Taki, 1964: synonym of Amphioctopus marginatus (Iw. Taki, 1964) Octopus marmoratus Hoyle, 1885: synonym of Octopus cyanea Gray, 1849 Octopus membranaceus Quoy & Gaimard, 1832: synonym of Amphioctopus membranaceus (Quoy & Gaimard, 1832) Octopus microstomus Reynaud, 1830: synonym of Tremoctopus violaceus delle Chiaje, 1830 Octopus moschatus Rafinesque, 1814: synonym of Octopus vulgaris Cuvier, 1797 Octopus moschatus Lamarck, 1798: synonym of Eledone moschata (Lamarck, 1798) Octopus mototi Norman, 1992: synonym of Amphioctopus mototi (Norman, 1992) Octopus neglectus Nateewathana & Norman, 1999: synonym of Amphioctopus neglectus (Nateewathana & Norman, 1999) Octopus nierstraszi W. Adam, 1938: synonym of Hapalochlaena nierstraszi (W. Adam, 1938) Octopus nierstrazi [sic]: synonym of Octopus nierstraszi W. Adam, 1938: synonym of Hapalochlaena nierstraszi (W. Adam, 1938) Octopus niger Risso, 1854: synonym of Octopus vulgaris Cuvier, 1797 Octopus niger Rafinesque, 1814: synonym of Octopus vulgaris Cuvier, 1797 Octopus nocturnus Norman & Sweeney, 1997: synonym of Callistoctopus nocturnus (Norman & Sweeney, 1997) Octopus obesus Verrill, 1880: synonym of Bathypolypus bairdii (Verrill, 1873) Octopus ocellatus Gray, 1849: synonym of Amphioctopus fangsiao (d'Orbigny, 1839) Octopus octopodia Tryon, 1879: synonym of Octopus vulgaris Cuvier, 1797 Octopus ornatus Gould, 1852: synonym of Callistoctopus ornatus (Gould, 1852) – ornate octopus or white-striped octopus Octopus ovulum Sasaki, 191: synonym of Amphioctopus ovulum (Sasaki, 1917) Octopus rapanui Voss, 1979: synonym of Callistoctopus rapanui (Voss, 1979) Octopus patagonicus Lönnberg, 1898: synonym of Enteroctopus megalocyathus (Gould, 1852) Octopus pictus Brock, 1882: synonym of Hapalochlaena fasciata (Hoyle, 1886) Octopus pictus Verrill, 1883: synonym of Octopus verrilli Hoyle, 1886 Octopus pilosus Risso, 1826: synonym of Octopus vulgaris Cuvier, 1797 Octopus piscatorum Verrill, 1879: synonym of Bathypolypus bairdii (Verrill, 1873) Octopus polyzenia Gray, 1849: synonym of Amphioctopus polyzenia (Gray, 1849) Octopus punctatus Gabb, 1862: synonym of Enteroctopus dofleini (Wülker, 1910) Octopus pustulosus Sasaki, 1920: synonym of Octopus madokai Berry, 1921 Octopus rabassin Risso, 1854: synonym of Octopus vulgaris Cuvier, 1797 Octopus reticularis Petangna, 1828: synonym of Ocythoe tuberculata