Abralia megalops A. E. Verrill, 1882 accepted as Ancistrocheirus lesueurii (A. d'Orbigny, 1835) (additional source)
Abyssascidia millari Monniot F., 1971 (additional source)
Abyssopathes Opresko, 2002 (basis of record)
Acanthodasys aculeatus Remane, 1927 (additional source)
Acanthodasys arcassonensis Kisielewski, 1987 (additional source)
Achelia alaskensis (Cole, 1904) (additional source)
Achelia anomala Arnaud, 1974 (additional source)
Achelia assimilis (Haswell, 1885) (additional source)
Achelia borealis (Schimkewitsch, 1895) (additional source)
Achelia chelata (Hilton, 1939) (additional source)
Achelia communis (Bouvier, 1906) (additional source)
Achelia echinata Hodge, 1864 (additional source)
Achelia laevis Hodge, 1864 (additional source)
Achelia langi (Dohrn, 1881) (additional source)
Achelia latifrons (Cole, 1904) (additional source)
Achelia megova (Hilton, 1943) (additional source)
Achelia neotenica Krapp, 1986 (additional source)
Achelia ovosetosa (Hilton, 1942) (additional source)
Achelia quadridentata (Hodgson, 1910) (additional source)
Achelia sawayai Marcus, 1940 (additional source)
Achelia simplex (Giltay, 1934) (additional source)
Achelia simplissima (Hilton, 1939) (additional source)
Achelia spinosa (Stimpson, 1853) (additional source)
Achelia spinoseta (Hilton, 1939) (additional source)
Achelia turba Stock, 1990 (additional source)
Achelia vulgaris (Costa, 1861) (additional source)
Achoerus pachycaudatus Dörjes, 1968 (additional source)
Actinia striata Rizzi, 1907 (additional source)
Actinoposthia beklemishevi Mamkaev, 1965 accepted as Actinoposthia beklemischevi Mamkaev, 1965 (additional source)
Actinoposthia biaculeata Faubel, 1974 (additional source)
Actinoposthia haplovata Dörjes, 1968 accepted as Childia haplovata Dörjes, 1968 (additional source)
Actinoposthia longa Faubel, 1976 (additional source)
Actinoposthia pigmentea Faubel, 1976 (additional source)
Actinoposthiidae Hooge, 2001 (basis of record)
Adagnesia charcoti Monniot C. & Monniot F., 1973 (additional source)
Adagnesia rimosa Monniot C. & Monniot F., 1974 (additional source)
Adeloposthia elegans An Der Lan, 1936 accepted as Paraproporus elegans (An der Lan, 1936) (source of synonymy)
Adenocauda helgolandica Dörjes, 1968 (additional source)
Adenopea chuni (Brauner, 1920) (additional source)
Afronta rubra Faubel, 1976 (additional source)
Agnezia atlantica (Monniot C. & Monniot F., 1973) (additional source)
Agnezia celtica (Monniot C. & Monniot F., 1974) (additional source)
Alloeocarpa loculosa Monniot C., 1974 (additional source)
Allopauropus danicus (Hansen, 1902) (additional source)
Allopauropus littoralis Bagnall, 1935 (basis of record)
Allopauropus stepheni Bagnall, 1935 (basis of record)
Alloposus mollis A. E. Verrill, 1880 accepted as Haliphron atlanticus Steenstrup, 1861 (source of synonymy)
Alluna sublitoralis Faubel & Regier, 1983 (additional source)
Alomasoma Zenkevitch, 1958 (basis of record)
Alomasoma nordpacificum Zenkevitch, 1958 (additional source)
Althoffia tumida Lohmann, 1892 (additional source)
Ammothea carolinensis Leach, 1814 (additional source)
Ammothea clausi Pfeffer, 1889 (additional source)
Ammothea hilgendorfi (Böhm, 1879) (additional source)
Ammothea magniceps Thompson, 1884 (additional source)
Ammothea minor (Hodgson, 1907) (additional source)
Ammothella appendiculata (Dohrn, 1881) (additional source)
Ammothella biunguiculata (Dohrn, 1881) (additional source)
Ammothella gibraltarensis Munilla, 1993 (additional source)
Ammothella hispida (Hodge, 1864) accepted as Achelia hispida Hodge, 1864 (additional source)
Ammothella longioculata (Faraggiana, 1940) (additional source)
Ammothella longipes (Hodge, 1864) (additional source)
Ammothella tubicen Stock, 1978 (additional source)
Ammothella uniunguiculata (Dohrn, 1881) (additional source)
Amphilina foliacea (Rudolphi, 1819) Wagener, 1858 (additional source)
Amphioctopus P. Fischer, 1882 (basis of record)
Amphioxus lanceolatus (Pallas, 1774) accepted as Branchiostoma lanceolatum (Pallas, 1774) (source of synonymy)
Amphiscolops cinereus (Graff, 1874) (additional source)
Amphiscolops fulgineus Peebles, 1915 accepted as Amphiscolops fuligineus Peebles, 1913 (additional source)
Amphiscolops langerhansi Graff, 1882 accepted as Heterochaerus langerhansi (Graff, 1882) (additional source)
Amphiscolops mosaicus Kozloff, 1998 (additional source)
Amphiscolops zeii Riedl, 1956 (additional source)
Anaperus biaculeatus Boguta, 1970 accepted as Thalassoanaperus biaculeatus (Boguta, 1970) (additional source)
Anaperus rubellus Westblad, 1945 accepted as Thalassoanaperus rubellus (Westblad, 1945) (additional source)
Anaperus tvaerminnensis (Luther, 1912) accepted as Thalassoanaperus tvaerminnensis (Luther, 1912) (additional source)
Anelassorhynchus indivisus (Sluiter, 1900) (additional source)
Anelassorhynchus semoni (Fischer, 1896) (additional source)
Anisolabis maritima (Bonelli, 1832) (additional source)
Anomopera ingolfiana Hartmeyer, 1923 (additional source)
Anoplodactylus angulatus (Dohrn, 1881) (additional source)
Anoplodactylus arnaudae Stock, 1978 (additional source)
Anoplodactylus australis (Hodgson, 1914) (additional source)
Anoplodactylus batangensis (Helfer, 1938) (additional source)
Anoplodactylus californicus Hall, 1912 (additional source)
Anoplodactylus capensis (Flynn, 1928) (additional source)
Anoplodactylus chilensis Hedgpeth, 1961 (additional source)
Anoplodactylus compositus Chimenz, Cottarelli & Tosti, 1991 (additional source)
Anoplodactylus digitatus (Böhm, 1879) (additional source)
Anoplodactylus hokkaidoensis (Utinomi, 1954) (additional source)
Anoplodactylus insignis (Hoek, 1881) (additional source)
Anoplodactylus iuleus Stock, 1975 (additional source)
Anoplodactylus jonesi Child, 1974 (additional source)
Anoplodactylus lentus Wilson, 1878 (additional source)
Anoplodactylus longiceps Stock, 1951 (additional source)
Anoplodactylus marcusi (Mello-Leitao, 1949) (additional source)
Anoplodactylus maritimus Hodgson, 1914 (additional source)
Anoplodactylus massiliensis Bouvier, 1916 (additional source)
Anoplodactylus oculatus Carpenter, 1905 (additional source)
Anoplodactylus petiolatus (Krøyer, 1844) (additional source)
Anoplodactylus pycnosoma (Helfer, 1938) (additional source)

Mediterranean Sea for Centroderes eisigii Zelinka, 1928 

English 10-tentacle burrowing anemone for Halcampa decemtentaculata Hand, 1955
English 12-tentacle burrowing anemone for Halcampa duodecimcirrata (Sars, 1851)
English 12-tentacle parasitic anemone for Peachia parasitica (Agassiz, 1861)
English Abbott's booby for Papasula abbotti Ridgway, 1893
English aberrant toothshell for Gadila aberrans (Whiteaves, 1887)
English adhesive sea anemone for Cryptodendrum adhaesivum (Klunzinger, 1877)
English African pillow coral for Siderastrea savignyana Milne Edwards & Haime, 1849
English African squid [from synonym] for Loligo africana (Adam, 1950)
English Agassiz toothshell for Gadila agassizii (Dall, 1881)
English Alaskan anemone for Charisea saxicola Torrey, 1902
English Aleutian tern [from synonym] for Sterna aleutica Baird, 1869
English Amazon tern [from synonym] for Sterna superciliaris Vieillot, 1819
English American tuskshell for Paradentalium americanum (Chenu, 1843)
English anagolous bobtail for Sepiola affinis Naef, 1912
English ancient murrelet for Synthliboramphus antiquus (Gmelin, 1789)
English Andean gull for Larus serranus Tschudi, 1844
English Andrew's frigatebird for Fregata andrewsi Mathews, 1914
English anemone coral for Goniopora albiconus Veron, 2000
English anemone coral for Goniopora burgosi Nemenzo, 1955
English anemone coral for Goniopora cellulosa Veron, 1990
English anemone coral for Goniopora ciliatus Veron, 2000
English anemone coral for Goniopora columna Dana, 1846
English anemone coral for Goniopora djiboutiensis Vaughan, 1907
English anemone coral for Goniopora eclipsensis Veron & Pichon, 1982
English anemone coral for Goniopora fruticosa Saville-Kent, 1891
English anemone coral for Goniopora lobata Milne Edwards, 1860
English anemone coral [from synonym] for Goniopora minor Crossland, 1952
English anemone coral for Goniopora norfolkensis Veron & Pichon, 1982
English anemone coral for Goniopora palmensis Veron & Pichon, 1982
English anemone coral for Goniopora pandoraensis Veron & Pichon, 1982
English anemone coral for Goniopora pearsoni Veron, 2000
English anemone coral for Goniopora pendulus Veron, 1985
English anemone coral for Goniopora planulata (Ehrenberg, 1834)
English anemone coral for Goniopora polyformis (Zou, 1980)
English anemone coral for Goniopora savignyi Dana, 1846
English anemone coral for Goniopora somaliensis Vaughan, 1907
English anemone coral for Goniopora stokesi Milne Edwards & Haime, 1851
English anemone coral [from synonym] for Goniopora stutchburyi Wells, 1955
English anemone coral for Goniopora sultani Veron, DeVantier & Turak, 2000
English anemone coral for Goniopora tenella (Quelch, 1886)
English anemone coral for Goniopora tenuidens (Quelch, 1886)
English angel squid for Ancistroteuthis lichtensteinii (A. Férussac [in A. Férussac & d'Orbigny], 1835)
English Angola flying squid for Todarodes angolensis Adam, 1962
English angular sea whip for Pterogorgia anceps (Pallas, 1766)
English annulate sticky hydroid for Eudendrium vaginatum Allman, 1863
English annulate tuskshell for Episiphon sowerbyi (Guilding, 1834)
English Antarctic flying squid for Todarodes filippovae Adam, 1975
English Antarctic fulmar for Fulmarus glacialoides (Smith, 1840)
English Antarctic neosquid for Alluroteuthis antarcticus Odhner, 1923
English Antarctic skua [from synonym] for Catharacta antarctica (Lesson, 1831)
English Antillean tuskshell [from synonym] for Antalis antillaris (A. d'Orbigny, 1847)
English Antilles bobtail squid for Austrorossia antillensis (G. L. Voss, 1955)
English Arafura file snake for Acrochordus arafurae McDowell, 1979
English arch-beaked whale for Mesoplodon carlhubbsi Moore, 1963
English Arctic brooding anemone for Epiactis arctica (Verrill, 1868)
English Argentine shortfin squid for Illex argentinus (Castellanos, 1960)
English armed cranch squid for Galiteuthis armata Joubin, 1898
English Armenian gull for Larus armenicus Buturlin, 1934
English Arnoux's beaked whale for Berardius arnuxii Duvernoy, 1851
English artichoke coral for Scolymia cubensis (Milne Edwards & Haime, 1848)
English Ascension frigatebird for Fregata aquila (Linnaeus, 1758)
English ashy storm-petrel for Oceanodroma homochroa (Coues, 1864)
English Atlantic armhook squid for Gonatus steenstrupi Kristensen, 1981
English Atlantic banded octopus for Octopus zonatus G. L. Voss, 1968
English Atlantic bird squid for Ornithoteuthis antillarum Adam, 1957
English Atlantic bobtail for Sepiola atlantica A. d'Orbigny, 1842
English Atlantic cranch squid for Teuthowenia megalops (Prosch, 1849)
English Atlantic gonate squid for Gonatus steenstrupi Kristensen, 1981
English Atlantic hump-backed dolphin for Sousa teuszii (Kükenthal, 1892)
English Atlantic mushroom coral for Scolymia lacera (Pallas, 1766)
English Atlantic warty octopus for Scaeurgus unicirrhus (Delle Chiaje, 1841)
English Auckland chag [from synonym] for Phalacrocorax colensoi Buller, 1888
English Audouin's gull for Larus audouinii Payraudeau, 1826
English Australasian gannet for Morus serrator (Gray, 1843)
English Australian fur seal for Arctocephalus pusillus (Schreber, 1775)
English Australian pelican for Pelecanus conspicillatus Temminck, 1824
English Australian snubfin dolphin for Orcaella heinsohni Beasley, Robertson & Arnold, 2005
English banana coral for Trachyphyllia geoffroyi (Audouin, 1826)
English banded tuskshell for Antalis circumcincta (R. B. Watson, 1879)
English banded water snake for Nerodia fasciata (Linnaeus, 1766)
English band-rumped storm-petrel for Oceanodroma castro (Harcourt, 1851)
English bank cormorant for Phalacrocorax neglectus (Wahlberg, 1855)
English Bartsch's squid [from synonym] for Uroteuthis bartschi Rehder, 1945
English beaded sea anemone for Heteractis aurora (Quoy & Gaimard, 1833)
English bean coral for Euphyllia fimbriata (Spengler, 1799)
English Beck's petrel for Pseudobulweria becki (Murphy, 1928)
English Beka squid [from synonym] for Loligo beka Sasaki, 1929
English Bennetts watersnake [from synonym] for Enhydris bennetti (Gray, 1842)
English Bermuda petrel for Pterodroma cahow (Nichols & Mowbray, 1916)
English berry armhook squid for Gonatus berryi Naef, 1923
English berry tuskshell for Antalis berryi (A. G. Smith & M. Gordon, 1948)
English bigeye inshore squid [from synonym] for Loligo ocula Cohen, 1976
English big-fin bobtail squid for Rossia megaptera A. E. Verrill, 1881
English black fan-shaped hydroid for Solanderia gracilis Duchassaing & Michelin, 1846
English black jelly for Chrysaora achlyos Martin, Gershwin, Burnett, Cargo & Bloom, 1997
English black noddy for Anous minutus Boie, 1844
English black right whale for Balaena mysticetus Linnaeus, 1758
English Black Sea fan for Iciligorgia schrammi Duchassaing, 1870
English Black Sea rod for Plexaura homomalla (Esper, 1794)
English Black Sea turtle [from synonym] for Chelonia agassizii Bocourt, 1868

 Habitat

 for Laevipilina cachuchensis Urgorri, García-Álvarez & Luque, 2005

bathyal [details]