Acanthodasys aculeatus Remane, 1927 (additional source)
Acanthodasys arcassonensis Kisielewski, 1987 (additional source)
Achelia echinata Hodge, 1864 (additional source)
Achelia laevis Hodge, 1864 (additional source)
Achelia simplex (Giltay, 1934) (additional source)
Achelia vulgaris (Costa, 1861) (additional source)
Ammothea hilgendorfi (Böhm, 1879) (additional source)
Ammothella longipes (Hodge, 1864) (additional source)
Amphioxus lanceolatus (Pallas, 1774) accepted as Branchiostoma lanceolatum (Pallas, 1774) (source of synonymy)
Anoplodactylus angulatus (Dohrn, 1881) (additional source)
Anoplodactylus petiolatus (Krøyer, 1844) (additional source)
Anoplodactylus pygmaeus (Hodge, 1864) (additional source)
Anoplodactylus virescens (Hodge, 1864) (additional source)
Antipathella Brook, 1889 (basis of record)
Aphanipathidae Opresko, 2004 (basis of record)
Aplidium caeruleum (Sluiter, 1906) (additional source)
Aplidium densum (Giard, 1872) (additional source)
Aplidium elegans (Giard, 1872) (additional source)
Aplidium glabrum (Verrill, 1871) (additional source)
Aplidium nordmanni (Milne Edwards, 1841) (additional source)
Aplidium ocellatum Monniot C. & Monniot F., 1987 (additional source)
Aplidium pallidum (Verrill, 1871) (additional source)
Aplidium proliferum (Milne Edwards, 1841) (additional source)
Aplidium punctum (Giard, 1873) (additional source)
Aplidium turbinatum (Savigny, 1816) (additional source)
Apochela (basis of record)
Appendicularia sicula Fol, 1874 (additional source)
Archidistoma aggregatum Garstang, 1891 (additional source)
Archidistoma productum (Milne Edwards, 1841) accepted as Pycnoclavella producta (Milne Edwards, 1841) (additional source)
Arthrotardigrada (basis of record)
Ascidia conchilega Müller, 1776 (additional source)
Ascidia mentula Müller, 1776 (additional source)
Ascidia obliqua Alder, 1863 (additional source)
Ascidia prunum Müller, 1776 (additional source)
Ascidia virginea Müller, 1776 (additional source)
Ascidiella aspersa (Müller, 1776) (additional source)
Aspidiophorus bisquamosus Mock, 1979 (additional source)
Aspidiophorus marinus Remane, 1926 (additional source)
Aspidiophorus mediterraneus Remane, 1927 (additional source)
Aspidiophorus ornatus Mock, 1979 (additional source)
Aspidiophorus paramediterraneus Hummon, 1974 (additional source)
Aspidosiphon (Aspidosiphon) muelleri Diesing, 1851 represented as Aspidosiphon (Aspidosiphon) muelleri muelleri Diesing, 1851 (additional source)
Astatumen Pilato, 1997 (basis of record)
Astatumen trinacriae (Arcidiacono, 1962) (basis of record)
Asterocarpa humilis (Heller, 1878) (additional source)
Australomedusidae Russell, 1971 (basis of record)
Balanoglossus clavigerus Delle Chiaje, 1829 (additional source)
Batillipedidae Ramazzotti, 1962 (additional source)
Beroe cucumis Fabricius, 1780 (additional source)
Beroe gracilis Künne, 1939 (additional source)
Bolinopsis infundibulum (O.F. Müller, 1776) (additional source)
Boltenia echinata (Linnaeus, 1767) (additional source)
Bolteniopsis prenanti Harant, 1927 (additional source)
Bonellia viridis Rolando, 1822 (additional source)
Botryllus schlosseri (Pallas, 1766) (additional source)
Brachioteuthis bowmani E. S. Russell, 1909 (additional source)
Brachioteuthis picta Chun, 1910 (additional source)
Branchiostoma lanceolatum (Pallas, 1774) (additional source)
Brumptiana lineata Llewellyn & Knight-Jones, 1984 (additional source)
Caecosagitta macrocephala (Fowler, 1904) (additional source)
Calliobdella lophii Van Beneden & Hesse, 1863 (additional source)
Calliobdella nodulifera (Malm, 1863) (additional source)
Callipallene brevirostris (Johnston, 1837) (additional source)
Callipallene phantoma (Dohrn, 1881) (additional source)
Callipallene producta (Sars, 1888) (additional source)
Callipallene spectrum (Dohrn, 1881) (additional source)
Callipallene tiberii (Dohrn, 1881) (additional source)
Calyptospadix Clarke, 1882 (basis of record)
Campyloderes macquariae Johnston, 1938 (additional source)
Caspiobdella Epshtein, 1966 (basis of record)
Caspiobdella tuberculata Epshtein, 1966 (basis of record)
Caudichthydium hummoni (Ruppert, 1977) (additional source)
Caudichthydium rupperti (Mock, 1979) (additional source)
Caudichthydium supralitorale (Mock, 1979) (additional source)
Centroderes spinosus (Reinhard, 1881) (additional source)
Cephalodasys maximus Remane, 1926 (additional source)
Cephalodiscidae Harmer, 1905 (basis of record)
Cephalodiscus M'Intosh, 1882 (basis of record)
Cephalodiscus levinseni Harmer, 1905 (basis of record)
Cephalorhyncha (additional source)
Chaetonotus (Chaetonotus) condensus Mock, 1979 (additional source)
Chaetonotus (Chaetonotus) larus (Müller, 1773) (additional source)
Chaetonotus (Chaetonotus) linguaeformis Voigt, 1902 (additional source)
Chaetonotus (Chaetonotus) tempestivus Mock, 1979 (additional source)
Chaetonotus (Hystricochaetonotus) lacunosus Mock, 1979 (additional source)
Chaetonotus (Marinochaetus) oceanides d'Hondt, 1971 (additional source)
Chaetonotus (Schizochaetonotus) atrox Wilke, 1954 (additional source)
Chaetonotus (Schizochaetonotus) dispar Wilke, 1954 (additional source)
Chaetonotus (Schizochaetonotus) inaequidentatus Kisielewski, 1988 (additional source)
Chaetonotus (Schizochaetonotus) neptuni Wilke, 1954 (additional source)
Chaetonotus balticus Remane, 1926 (additional source)
Chaetonotus maximus Ehrenberg, 1831 represented as Chaetonotus (Chaetonotus) maximus Ehrenberg, 1838 (additional source)
Chaetonotus parthenopeius Wilke, 1954 (additional source)
Chaetonotus somniculosus Mock, 1979 accepted as Halichaetonotus somniculosus (Mock, 1979) (additional source)
Chaetonotus variosquamatus Mock, 1979 (additional source)
Ciliocincta julini (Caullery & Mesnil, 1899) (additional source)
Ciona fascicularis Hancock, 1870 (additional source)
Ciona intestinalis (Linnaeus, 1767) (additional source)
Cladopathidae Kinoshita, 1910 (additional source)
Clava leptostyla L. Agassiz, 1862 accepted as Clava multicornis (Forsskål, 1775) (source of synonymy)

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