Occ
Occirhenea Iredale, 1933
- Occirhenea georgiana Quoy & Gaimard, 1832
Animalia → Mollusca → Gastropoda → Heterobranchia → Pulmonata → Rhytididae
Oce
- Oceanida
- Ocenebra
- Ocenotrophon
Och
- Ocheyoherpia
- Ochridopyrgula
Oci
- Ocinebrina
Oct
- Octomarginula
Red Octopoda Leach, 1818
Mollusca → Cephalopoda → Coleoidea → Octopodiformes
Octopodidae d'Orbigny, 1840
- Abdopus Norman & Finn, 2001
- Ameloctopus Norman, 1992
- Amphioctopus P. Fischer, 1882
- Callistoctopus Iw. Taki, 1964
- Cistopus Gray, 1849
- Danoctopus Joubin, 1933
- Euaxoctopus Voss, 1971
- Galeoctopus Norman, Boucher & Hochberg, 2004
- Grimpella Robson, 1928
- Hapalochlaena Robson, 1929
- Histoctopus Norman, Boucher-Rodoni & Hochberg, 2009
- Macrochlaena Robson, 1929
- Macroctopus Robson, 1928
- Macrotritopus Grimpe, 1922
- Octopus Cuvier, 1798
- Paroctopus Naef, 1923
- Polypus Leach, 1817
- Pteroctopus P. Fischer, 1882
- Robsonella Adam, 1938
- Sasakinella Iw. Taki, 1964
- Scaeurgus Troschel, 1857
- Teretoctopus Robson, 1929
- Thaumoctopus Norman & Hochberg, 2005
- Wunderpus Hochberg, Norman & Finn, 2006
Mollusca → Cephalopoda → Octopoda → Octopodoidea
Nadred Octopodiformes Berthold & Engeser, 1987
- Octopoda Leach, 1818
- Vampyromorpha Robson, 1929
Mollusca → Cephalopoda → Coleoidea
Natporodica Octopodoidea d'Orbigny, 1840
- Amphitretidae Hoyle, 1886
- Bathypolypodidae Robson, 1929
- Eledonidae Rochebrune, 1884
- Enteroctopodidae Strugnell, Norman, Vecchione, Guzik & Allcock, 2014
- Megaleledonidae Taki, 1961
- Octopodidae d'Orbigny, 1840
Mollusca → Cephalopoda → Octopoda → Incirrata
- Octoporia
- Octopoteuthidae
- Octopoteuthis
Octopus Cuvier, 1798
- Octopus alecto Berry, 1953
- Octopus argus Krauss, 1848
- Octopus australis Hoyle, 1885
- Octopus balboai Voss, 1971
- Octopus berenice Gray, 1849
- Octopus berrima Stanks & Norman, 1992
- Octopus bimaculatus Verrill, 1883
- Octopus bimaculoides Pickford & McConnaughey, 1949
- Octopus bocki Adam, 1941
- Octopus briareus Robson, 1929
- Octopus bulbus Norman, 2001
- Octopus bunurong Stranks, 1990
- Octopus californicus Berry, 1911
- Octopus campbelli (Smith, 1902)
- Octopus chierchiae Jatta, 1889
- Octopus conispadiceus (Sasaki, 1917)
- Octopus cyanea Gray, 1849
- Octopus diminutus Kaneko & Kubodera, 2008
- Octopus favonius Gray, 1849
- Octopus fitchi Berry, 1953
- Octopus gardineri (Hoyle, 1905)
- Octopus gorgonus Huffard, 2007
- Octopus harpedon Norman, 2001
- Octopus hattai (Sasaki, 1929)
- Octopus hawaiiensis Eydoux & Souleyet, 1852
- Octopus hongkongensis (Hoyle, 1885)
- Octopus hubbsorum Berry, 1953
- Octopus humilis Huffard, 2007
- Octopus hummelincki Adam, 1936
- Octopus huttoni (Benham, 1943)
- Octopus incella Kaneko & Kubodera, 2007
- Octopus insularis Leite & Haimovici in Leite, Haimovici, Molina & Warnke, 2008
- Octopus jollyorum Reid & Wilson, 2015
- Octopus joubini Robson, 1929
- Octopus kaharoa O'Shea, 1999
- Octopus kaurna Stranks, 1990
- Octopus kermadecensis (Berry, 1914)
- Octopus laqueus Kaneko & Kubodera, 2005
- Octopus mariles Huffard, 2007
- Octopus maya Voss & Solís, 1966
- Octopus mernoo O'Shea, 1999
- Octopus microphthalmus Goodrich, 1896
- Octopus micropyrsus Berry, 1953
- Octopus micros Norman, 2001
- Octopus mimus Gould, 1852
- Octopus minor (Sasaki, 1920)
- Octopus mutilans Taki, 1942
- Octopus nanus Adam, 1973
- Octopus occidentalis Steenstrup in Hoyle, 1885
- Octopus oculifer (Hoyle, 1904)
- Octopus oliveri (Berry, 1914)
- Octopus pallidus Hoyle, 1885
- Octopus parvus (Sasaki, 1917)
- Octopus penicillifer Berry, 1954
- Octopus pumilus Norman & Sweeney, 1997
- Octopus pyrum Norman, Hochberg & Lu, 1997
- Octopus rubescens Berry, 1953
- Octopus salutii Vérany, 1836
- Octopus sanctaehelenae Robson, 1929
- Octopus selene Voss, 1971
- Octopus stictochrus Voss, 1971
- Octopus superciliosus Quoy & Gaimard, 1832
- Octopus tehuelchus d'Orbigny [in Férussac & d'Orbigny], 1834
- Octopus tetricus Gould, 1852
- Octopus veligero Berry, 1953
- Octopus verrucosus Hoyle, 1885
- Octopus vitiensis Hoyle, 1885
- Octopus vulgaris Cuvier, 1797
- Octopus warringa Stranks, 1990
- Octopus wolfi (Wülker, 1913)
- Octopus zonatus Voss, 1968
Mollusca → Cephalopoda → Octopoda → Incirrata → Octopodoidea → Octopodidae
Ocy
Ocythoe Rafinesque, 1814
- Ocythoe tuberculata Rafinesque, 1814
Mollusca → Cephalopoda → Octopoda → Incirrata → Argonautoidea → Ocythoidae
Porodica Ocythoidae Gray, 1849
- Ocythoe Rafinesque, 1814
Mollusca → Cephalopoda → Octopoda → Incirrata → Argonautoidea