Literatuurreferentie
Titel | WoRMS, World Register of Marine Species. www.marinespecies.org |
Type | Website |
Auteur(s) | WoRMS |
Link |
Als referentie opgenomen bij
- Abietinaria abietina (Linnaeus, 1758)
- Abietinaria filicula (Ellis & Solander, 1786)
- Abyssoninoe Orensanz, 1990
- Abyssoninoe hibernica (McIntosh, 1903)
- Abyssoninoe scopa (Fauchald, 1974)
- Acanthocardia tuberculata (Linnaeus, 1758)
- Acanthocheilus Molin, 1858
- Acanthocheilus rotundatus (Rudolphi, 1819)
- Acanthochitonina
- Acartia bifilosa (Giesbrecht, 1881)
- Achaeus Leach, 1817
- Achaeus cranchii Leach, 1817
- Achatinoidea
- Achelia laevis Hodge, 1864
- Achiridae
- Acidostoma Lilljeborg, 1865
- Acidostoma obesum (Bate, 1862)
- Acidostomatidae
- Acipenser oxyrinchus Mitchill, 1815
- Acrochaetium Nägeli
- Acrochaetium secundatum (Lyngb.) Nägeli
- Acrocnida Gislén, 1926
- Acroloxoidea
- Acrosiphonia J.Agardh
- Acrosiphonia arcta (Dillwyn) Gain
- Acrosorium Zanardini ex Kütz.
- Acteon Montfort, 1810
- Acteon tornatilis (Linnaeus, 1758)
- Acteonidae
- Acteonoidea
- Actinia Linnaeus, 1767
- Actinia equina (Linnaeus, 1758)
- Actinia fragacea Tugwell, 1856
- Actinia prasina Gosse, 1860
- Actinia striata Quoy & Gaimard, 1833
- Actinostolidae
- Actinothoe Fischer, 1889
- Actinothoe sphyrodeta (Gosse, 1858)
- Adamsia Forbes, 1840
- Adapedonta
- Adelodrilus Cook, 1969
- Adelodrilus pusillus Erséus, 1978
- Adontorhina Berry, 1947
- Adontorhina similis Barry & McCormack, 2007
- Aeolidia filomenae Kienberger, Carmona, Pola, Padula, Gosliner & Cervera, 2016
- Aeolidiella alderi (Cocks, 1852)
- Aeolidiella sanguinea (Norman, 1877)
- Aeolidioidea
- Aequorea forskalea Péron & Lesueur, 1810
- Aequorea tenuis (Van Beneden, 1847)
- Aequorea vitrina Gosse, 1853
- Aetea Lamouroux, 1812
- Aetea anguina (Linnaeus, 1758)
- Agardhiella F.Schmitz
- Agarophyton Gurgel, J.N.Norris & Fredericq
- Agarophyton vermiculophyllum (Ohmi) Gurgel, J.N.Norris & Fredericq
- Aglantha digitale (Müller, 1766)
- Aglaophamus Kinberg, 1865
- Aglaophamus agilis (Langerhans, 1880)
- Aglaophenia pluma (Linnaeus, 1758)
- Aglaothamnion Feldm.-Maz.
- Ahnfeltia Fr.
- Ahnfeltia plicata (Huds.) Fr.
- Akanthophoreidae
- Akanthophoreus Sieg, 1986
- Akanthophoreus gracilis (Krøyer, 1842)
- Aktedrilus Knöllner, 1935
- Aktedrilus monospermathecus Knöllner, 1935
- Alcyonidioides d'Hondt, 2001
- Alcyonidium Lamouroux, 1813
- Alcyonidium condylocinereum Porter, 2004
- Alcyonidium diaphanum (Hudson) Lamouroux
- Alcyonidium gelatinosum (Linnaeus, 1761)
- Alcyonidium hirsutum (Fleming, 1828)
- Alcyonidium hydrocoalitum Porter, 2004
- Alcyonidium mamillatum Alder, 1857
- Alcyonidium parasiticum (Fleming, 1828)
- Alcyonidium polyoum (Hassall, 1841)
- Alcyonium Linnaeus, 1758
- Alcyonium digitatum Linnaeus, 1758
- Alderia
- Alderia modesta (Lovén, 1844)
- Alentia Malmgren, 1866
- Alentia gelatinosa (Sars, 1835)
- Alexandrium Halim
- Alexandrium leei Balech
- Alexandrium tamarense (Lebour) Balech
- Alitta Kinberg, 1865
- Alitta succinea (Frey & Leuckart, 1847)
- Allogastropoda
- Allomelita Stock, 1984
- Allomelita pellucida (Sars, 1882)
- Alopias Rafinesque, 1810
- Alosa Linkc, 1790
- Altenaeum Spaink, 1972
- Altenaeum dawsoni (Jeffreys, 1864)
- Alvania lactea (Michaud, 1830)
- Amathia (Farre, 1837)
- Amathia citrina (Hincks, 1877)
- Amathia gracilis (Leidy, 1855)
- Amathia imbricata (Adams, 1798)
- Amblyraja radiata (Donovan, 1808)
- Ammothea Leach, 1814
- Ammothea hilgendorfi (Böhm, 1879)
- Ammothella Verrill, 1900
- Ammothella longipes (Hodge, 1864)
- Amnicolidae
- Ampelisca diadema (Costa, 1853)
- Ampelisca gibba Sars, 1883
- Ampelisca macrocephala Liljeborg, 1852
- Ampelisca spinipes Boeck, 1861
- Ampelisca tenuicornis Lilljeborg, 1855
- Ampelisca typica (Bate, 1856)
- Ampharete Malmgren, 1866
- Ampharete acutifrons (Grube, 1860)
- Ampharete falcata Eliason, 1955
- Ampharete finmarchica (Sars, 1864)
- Ampharete lindstroemi Malmgren, 1867 sensu Hessle, 1917
- Amphibalanus Pitombo, 2004
- Amphiblestrum Gray, 1848
- Amphiblestrum auritum (Hincks, 1877)
- Amphicteis Grube, 1850
- Amphicteis gunneri (Sars, 1835)
- Amphictene Savigny, 1822
- Amphictene auricoma (Müller, 1776)
- Amphilochoides Sars, 1895
- Amphilochoides boecki Sars, 1892
- Amphinema rugosum (Mayer, 1900)
- Amphinomida
- Amphinomidae
- Amphiporus bioculatus McIntosh, 1874
- Amphisbetia operculata (Linnaeus, 1758)
- Amphiura chiajei Forbes, 1843
- Amphiura filiformis (Müller, 1776)
- Ampithoe Leach, 1814
- Ampithoe valida Smith, 1873
- Ampithoidae
- Ampularioidea
- Anadara Gray, 1847
- Anadara kagoshimensis (Tokunaga, 1906)
- Anapagurus Henderson, 1886
- Anapagurus laevis (Bell, 1846)
- Anchistrotos Brian, 1906
- Anemonia Risso, 1826
- Anemonia viridis (Forskål, 1775)
- Anguilla Schrank, 1798
- Anguinella Van Beneden, 1845
- Anguinella palmata Van Beneden, 1845
- Anisakis physeteris (Baylis, 1923)
- Anobothrus Levinsen, 1884
- Anobothrus gracilis (Malmgren, 1866)
- Anomalodesmata
- Anomioidea
- Anotrichium Nägeli
- Antalis Adams & Adams, 1854
- Anthopleura Duchassaing de Fonbressin & Michelotti, 1860
- Anthopleura thallia (Gosse, 1854)
- Antinoella Augener, 1928
- Antinoella finmarchica (Malmgren, 1867)
- Antithamnion Nägeli
- Antithamnion densum (Suhr) M.A.Howe
- Antithamnionella Lyle
- Aonides Claparède, 1864
- Aonides oxycephala (Sars, 1862)
- Aonides oxycephala Southern, 1914
- Aonides paucibranchiata Southern, 1914
- Aoroides Walker, 1898
- Aoroides semicurvatus Ariyama, 2004
- Apherusa clevei Sars, 1904
- Apherusa ovalipes Norman & Scott, 1906
- Aphragmophora
- Aphrodita (Linnaeus, 1758)
- Aphrodita aculeata Linnaeus, 1758
- Aphroditidae
- Apiocystis Nägeli
- Apistobranchidae
- Apistobranchus Levinsen, 1883
- Apistobranchus tullbergi (Théel, 1879)
- Aplysilla Schulze, 1878
- Aplysilla rubra (Hanitsch, 1890)
- Apocorophium Bousfield & Hoover, 1997
- Apodida
- Apoglossum J.Agardh
- Apohyale Bousfield & Hendrycks, 2002
- Aporrhais pespelecani (Linnaeus, 1758)
- Apseudes Leach, 1813
- Apseudes talpa (Montagu, 1808)
- Apseudidae
- Arachnidium Hincks, 1859
- Arachnidium fibrosum Hincks, 1880
- Arachnidium lacourti d'Hondt & Faasse, 2006
- Archinemertea Iwata, 1960
- Architaenioglossa
- Arcida
- Arcidae Lamarck, 1809
- Arcoidea
- Arcticoidea
- Arcuatula Jousseaume in Lamy, 1919
- Arcuatula senhousia (Benson, 1842)
- Arenicola defodiens Cadman & Nelson-Smith, 1993
- Argentina Linnaeus, 1758
- Argissa Boeck, 1871
- Argissa hamatipes (Norman, 1869)
- Argissidae
- Arhynchobatidae
- Arhythmorhynchus Lühe, 1911
- Arhythmorhynchus frassoni (Molin, 1858)
- Arhythmorhynchus longicollis (Villot, 1875)
- Aricidea Webster, 1879
- Aricidea cerrutii Laubier, 1966
- Aricidea minuta Southward, 1956
- Aricidea roberti Hartley, 1983
- Aricidea simonae Laubier & Ramos, 1974
- Aricidea suecica Eliason, 1920
- Aricidea wassi Pettibone, 1965
- Arietelloidea
- Ariomma Jordan & Snyder, 1904
- Ariomma indicum (Day, 1871)
- Ariommatidae
- Arionoidea
- Arthurdendyus Jones, 1999
- Asbjornsenia (Lovén, 1846)
- Ascetosporea
- Ascidia Linnaeus, 1767
- Ascidia mentula Müller, 1776
- Ascidia virginea Müller, 1776
- Ascidicolidae
- Ascidiella aspersa (Müller, 1776)
- Asparagopsis Mont.
- Aspidelectra Levinsen, 1909
- Aspidelectra melolontha (Landsborough, 1852)
- Aspidiophorus Voigt, 1903
- Aspidiophorus marinus Remane, 1926
- Aspidosiphon Diesing, 1851
- Aspidosiphon muelleri Diesing, 1851
- Aspidosiphonida
- Aspidosiphonidae
- Asterocheridae
- Atelecyclidae
- Atelecyclus Leach, 1814
- Atelecyclus rotundatus (Olivi, 1792)
- Atelecyclus undecimdentatus (Herbst, 1783)
- Athanas Leach, 1814
- Atherospio Mackie & Duff, 1986
- Atherospio disticha Mackie et Duff, 1986
- Atherospio guillei (Laubier et Ramos, 1974)
- Atylidae
- Atylus Leach, 1815
- Atylus vedlomensis (Bate & Westwood, 1862)
- Audouinella Bory
- Aulactinia Agassiz in Verrill, 1864
- Aurelia Lamarck, 1816
- Aurelia aurita (Linnaeus, 1758)
- Auriculinella Tausch, 1886
- Aurospio Maciolek, 1981
- Aurospio banyulensis Laubier, 1966
- Autonoe Bruzelius, 1859
- Autonoe longipes (Liljeborg, 1852)
- Axinulus Verrill & Bush, 1898
- Axinulus croulinensis (Jeffreys, 1847)
- Balanus glandula Darwin, 1854
- Bangia Lyngb.
- Basterotiidae
- Bathyporeia nana Toulmond, 1966
- Bathyporeia tenuipes Meinert, 1877
- Bathyraja Ishiyama, 1958
- Batillipes pennaki Marcus, 1946
- Batrachospermum Roth
- Battersia Reinke ex Batters
- Bela Leach, 1847
- Bela nebula (Montagu, 1803)
- Bicellariella Levinsen, 1909
- Bicellariella ciliata (Linnaeus, 1758)
- Biddulphia Gray, 1821
- Biddulphia longicruris Greville
- Biddulphiaceae
- Biddulphiales
- Biflustra d'Orbigny, 1852
- Biflustra grandicella (Canu & Bassler, 1929)
- Biflustra tenuis (Desor, 1848)
- Bifurcaria Stackhouse
- Bifurcaria bifurcata R.Ross
- Bimastos Moore, 1893
- Bimeria Wright, 1859
- Bimeria vestita Wright, 1859
- Binuclearia Wittr.
- Bipalium Stimpson, 1857
- Bipalium kewense Moseley, 1878
- Bispira crassicornis (Sars, 1851)
- Bittium Gray, 1847
- Bittium reticulatum (da Costa, 1778)
- Bivalvulida
- Blackfordia Mayer, 1910
- Blackfordia virginica Mayer, 1910
- Blidingia Kylin
- Boccardia Carazzi, 1893
- Boccardia proboscidea Hartman, 1940
- Boccardiella Blake & Kudenov, 1978
- Boccardiella hamata (Webster, 1879)
- Bodotria Goodsir, 1843
- Bodotria arenosa Goodsir, 1843
- Bodotria pulchella Sars, 1878
- Bolbocoleon Pringsh.
- Bolocera Gosse, 1860
- Bolocera tuediae (Johnston, 1832)
- Bomolochidae
- Bonamia Pichot, Comps, Tigé, Grizel & Rabouin, 1980
- Bonamia ostreae Pichot, Comps, Tigé, Grizel & Rabouin
- Bonelliidae
- Bonnemaisonia C.Agardh
- Bonnemaisonia hamifera Har.
- Boonea R. Robertson, 1978
- Boonea bisuturalis (Say, 1822)
- Bostrychia Mont.
- Botrytella micromora Bory
- Botrytella parva (Takamatsu) H.S.Kim
- Bougainvillia Lesson, 1830
- Bougainvillia britannica (Forbes, 1841)
- Bougainvillia muscus (Allman, 1863)
- Bougainvillia principis (Steenstrup, 1850)
- Bougainvillia superciliaris (Agassiz, 1849)
- Brachycladium Looss, 1899
- Brachycladium goliath (van Beneden, 1858)
- Brachystomia Monterosato, 1884
- Brada Stimpson, 1854
- Brada villosa (Rathke, 1853)
- Branchiomma bombyx (Dalyell, 1853)
- Branchiostoma Costa, 1834
- Branchiostoma lanceolatum (Pallas, 1774)
- Branchiostomatidae
- Brissidae
- Brissopsis L. Agassiz, 1840
- Brissopsis lyrifera (Forbes, 1841)
- Britorchestia Lowry & Bopiah, 2012
- Brosme Oken, 1817
- Brosme brosme (Ascanius, 1772)
- Bryopsis J.V.Lamour.
- Buccinoidea
- Bugula Oken, 1815
- Bugula neritina (Linnaeus, 1758)
- Bugulina Gray, 1848
- Bugulina avicularia (Linnaeus, 1758)
- Bugulina flabellata (Thompson in Gray, 1848)
- Bugulina simplex (Hincks, 1886)
- Bugulina stolonifera (Ryland, 1960)
- Bulbochaete C.Agardh
- Bulloidea
- Buskia Alder, 1857
- Buskia nitens Alder, 1856
- Bylgides Chamberlin, 1919
- Bylgides elegans (Théel, 1879)
- Bylgides sarsi (Kinberg in Malmgren, 1866)
- Caenogastropoda
- Calanidae
- Calanoidea
- Calanus Leach, 1816
- Callianassa subterranea (Montagu, 1808)
- Calliblepharis Kütz.
- Calliopius Lilljeborg, 1865
- Calliostoma zizyphinum (Linnaeus, 1758)
- Calliostomatidae
- Callithamniaceae
- Callithamnion Lyngb.
- Callophyllis Kütz.
- Callopora Gray, 1848
- Callopora dumerilii (Adouin, 1826)
- Calycella syringa (Linnaeus, 1767)
- Calycidorididae
- Calyptraeoidea
- Camarodonta
- Campanularia hincksii Alder, 1856
- Campanularia volubilis (Linnaeus, 1758)
- Campanulina pumila (Clark, 1875)
- Campylaspis Sars, 1865
- Campylaspis glabra Sars, 1878
- Canalipalpata
- Cancer Linnaeus, 1758
- Cancerillidae
- Candacia Dana, 1866
- Candaciidae
- Canuellidae
- Capitella minima Langerhans, 1881
- Caprella equilibra Say, 1818
- Caprella scaura Templeton, 1836
- Capsosiphon Gobi
- Cardiida
- Cardioidea
- Carditida
- Caryophyllia Lamarck, 1801
- Caryophyllia smithii Stokes & Broderip, 1828
- Catenella Grev.
- Catriona Winckworth, 1941
- Catriona gymnota (Couthouy, 1838)
- Caudofoveata
- Caulacanthus Kützing, 1843
- Caulacanthus okamurae Yamada, 1933
- Caulleriella Chamberlin, 1919
- Caulleriella alata (Southern, 1914)
- Cellepora Linnaeus, 1767
- Cellepora pumicosa (Pallas, 1766)
- Celleporella Gray, 1848
- Celleporella hyalina (Linnaeus, 1767)
- Celleporidae
- Celleporina Gray, 1848
- Celleporina caliciformis (Lamouroux, 1816)
- Celtodoryx Perez, Perrin, Carteron, Vacelet & Boury-Esnault, 2006
- Celtodoryx ciocalyptoides (Burton, 1935)
- Cephalaspidea
- Cephalaspidea
- Cephalodasyidae
- Cephalodasys Remane, 1926
- Cephalodasys littoralis Renaud-Debyser, 1964
- Cephalodasys turbanelloides (Boaden, 1960)
- Cephalorhyncha
- Cephalothrix simula Iwata, 1952
- Ceramium Roth
- Ceramium botryocarpum A.W.Griffiths ex Harv.
- Ceramium sungminbooi J.R.Hughey & G.H.Boo
- Ceramium tenuicorne (Kützing) Waern
- Ceramium virgatum Roth, 1797
- Cerastoderma glaucum (Bruguière, 1789)
- Ceratocephale Malmgren, 1867
- Ceratocephale loveni Malmgren, 1867
- Cercozoa
- Cerebratulus Renier, 1804
- Cerebratulus fuscus (McIntosh, 1874)
- Cerebratulus marginatus Renier, 1804
- Cerebratulus roseus (Delle Chiaje, 1841)
- Cereus Oken, 1815
- Cereus pedunculatus (Pennant, 1777)
- Cerianthus Delle Chiaje, 1830
- Cerianthus lloydii Gosse, 1859
- Cerithiidae
- Cerithiopsidae
- Cerithiopsis Forbes & Hanley, 1850
- Cerithiopsis tubercularis (Montagu, 1803)
- Cerithoidea
- Cetorhinus Blainville, 1816
- Chaetochloris Pascher & Korshikov
- Chaetoderma Lovén, 1844
- Chaetodermatida
- Chaetomorpha Kütz.
- Chaetomorpha ligustica (Kützing) Kützing
- Chaetonema Nowak.
- Chaetopeltis Berthold
- Chaetophora Schrank
- Chaetopterus Cuvier, 1830
- Chaetopterus variopedatus Cuvier, 1827
- Chaetosphaeridium Kleb.
- Chaetozone Malmgren, 1867
- Chaetozone christiei Chambers, 2000
- Chaetozone gibber Woodham & Chambers, 1994
- Chaetozone setosa Malmgren, 1867
- Chalinula Schmidt, 1868
- Chamelea Mörch, 1853
- Chamelea gallina (Linnaeus, 1758)
- Champia Desv.
- Chara L.
- Characium Braun ex Kütz.
- Cheirocratidae
- Cheirocratus intermedius Sars, 1895
- Chelicorophium Bousfield & Hoover, 1997
- Chelicorophium curvispinum (Sars, 1895)
- Chelidonichthys Kaup, 1873
- Chitonida
- Chitonina
- Chitonoidea
- Chlorocystidaceae
- Chlorocystidales
- Chondracanthidae
- Chondracanthus Kütz.
- Chondria C.Agardh
- Chondrus Stackh.
- Chone Krøyer, 1856
- Chone duneri Malmgren, 1867
- Chone fauveli McIntosh, 1916
- Chone infundibuliformis Krøyer, 1856
- Choreocolax Reinsch
- Chromista
- Chromulinales incertae sedis
- Chroodactylon Hansg.
- Chrysallida sarsi Nordsieck, 1972
- Chrysamoebaceae
- Chrysaora Péron & Lesueur, 1810
- Chrysaora hysoscella (Linnaeus, 1767)
- Chrysomeridaceae
- Chrysomeridales
- Chrysomerophyceae
- Chrysosphaeraceae
- Chrysothallaceae
- Chylocladia Grev.
- Cingulopsoidea
- Circeis Saint-Joseph, 1894
- Circeis spirillum (Linnaeus, 1758)
- Cirolana Leach, 1818
- Cirolana cranchi Leach, 1818
- Cirratulus Lamarck, 1818
- Cirratulus cirratus (Müller, 1776)
- Cirriformia Hartman, 1936
- Cirriformia tentaculata (Montagu, 1808)
- Cladonema radiatum (Dujardin, 1843)
- Cladophora Kütz.
- Cladophora lehmanniana (Lindenberg) Kützing
- Cladostephus spongiosus subsp. verticillatus (Lightfoot) Prud'homme van Reine
- Clathrina Gray, 1867
- Clathrina coriacea (Montagu, 1818)
- Clausidiidae
- Clausilioidea
- Clausinella Gray, 1851
- Clausinella fasciata (da Costa, 1778)
- Clausocalanidae
- Clausocalanoidea
- Clava multicornis (Forskål, 1775)
- Clavelina Savigny, 1816
- Clavelina lepadiformis (Müller, 1776)
- Clavelinidae
- Clupea Linnaeus, 1758
- Clymenura borealis (Arwidsson, 1906)
- Clymenura lankesteri (McIntosh, 1885)
- Clytia gracilis (Sars, 1850)
- Clytia hemisphaerica (Linnaeus, 1767)
- Cobitidae
- Cochlicopoidea
- Cochliopidae
- Codium Stackh.
- Codium fragile subsp. atlanticum (Cotton) P.C.Silva
- Codium fragile subsp. fragile (Suringar) Har.
- Codonium Haeckel, 1879
- Colaconema Batters
- Coleochaete Bréb.
- Colus islandicus (Mohr, 1786)
- Conger Bosc, 1817
- Conoidea
- Conopeum Gray, 1848
- Conopeum reticulum (Linnaeus, 1767)
- Conopeum seurati (Canu, 1928)
- Corallina L.
- Cordylophora caspia (Pallas, 1771)
- Cordylophoridae
- Corella parallelogramma (Müller, 1776)
- Corycaeidae
- Corymorpha nana Alder, 1858
- Corymorpha nutans Sars, 1835
- Corynactis Allman, 1846
- Corynactis viridis Allman, 1846
- Coryne muscoides (Linnaeus, 1761)
- Coryne pusilla Gaertner, 1774
- Corynophlaea Kütz.
- Coryphella Gray, 1850
- Coryphella verrucosa (Sars, 1829)
- Coryphellidae
- Corystes Bosc, 1801
- Cosmetira pilosella Forbes, 1848
- Cossura Webster & Benedict, 1887
- Cossura longocirrata Webster et Benedict, 1887
- Cossura pygodactylata Jones, 1956
- Cossuridae
- Craspedacusta sowerbii Lankester, 1880
- Crassatelloidea
- Crassicauda Leiper & Atkinson, 1914
- Crassicauda boopis Baylis, 1920
- Crassicorophium Bousfield & Hoover, 1997
- Crassicorophium bonellii (Milne Edwards, 1830)
- Cratena Bergh, 1864
- Cratena lineata (Eliot, 1905)
- Crenella T. Brown, 1827
- Crenella decussata (Montagu, 1808)
- Cribrilina Gray, 1848
- Cribrilina cryptooecium Norman, 1903
- Cribrilina punctata (Hassall, 1841)
- Crisia Lamouroux, 1812
- Crisia aculeata Hassall, 1841
- Crisilla Monterosato, 1917
- Crisilla semistriata (Montagu, 1808)
- Cristatella Cuvier, 1798
- Cristatella mucedo Cuvier, 1798
- Crisularia Gray, 1848
- Crisularia plumosa (Pallas, 1766)
- Crouania J.Agardh
- Cryptoplacoidea
- Cryptopleura Kütz.
- Cryptorchestia Lowry & Fanini, 2013
- Cryptosula Canu & Bassler, 1925
- Cryptosula pallasiana (Moll, 1803)
- Ctenodrilidae
- Ctenodrilus Claparède, 1863
- Ctenostomatida
- Cucumaria de Blainville, 1830
- Cucumaria frondosa (Gunnerus, 1767)
- Cucumariidae
- Cumanotus Odhner, 1907
- Cumanotus beaumonti (Eliot, 1906)
- Cumopsis Sars, 1865
- Cuspidaria Nardo, 1840
- Cuthona Alder & Hancock, 1855
- Cuthonella Bergh, 1884
- Cyamus Latreille, 1796
- Cyamus catodontis Margolis, 1954
- Cyanea Péron & Lesueur, 1810
- Cyanea capillata (Linnaeus, 1758)
- Cyanea lamarckii Péron & Lesueur, 1810
- Cycloneritimorpha
- Cyclophoroidea
- Cyclopinidae
- Cylichna Lovén, 1846
- Cylichna cylindracea (Pennant, 1777)
- Cylindrocapsa Reinsch
- Cylindropsyllidae
- Cylista Wright, 1859
- Cylista elegans Dalyell, 1848
- Cylista undata Müller, 1778
- Cymbasoma Thompson I.C., 1888
- Cypraeoidea
- Cyrenoidea
- Cystoclonium Kütz.
- Dactylopusiidae
- Dalatias Rafinesque, 1810
- Darwinellidae Merejkowsky, 1879
- Dasya C.Agardh
- Dasya sessilis Yamada, 1928
- Dasyatis Rafinesque, 1810
- Dasysiphonia I.K.Lee & J.A.West
- Dasysiphonia japonica (Yendo) H.S.Kim
- Decapodiformes
- Delavalia Brady, 1868
- Delesseria J.V.Lamour.
- Dendroceratida Minchin, 1900
- Dendrochirotida
- Dendronotus Alder & Hancock, 1845
- Dendronotus europaeus Korshunova, Martynov, Bakken & Picton, 2017
- Dentaliida
- Dentaliidae
- Derbesia Solier, 1846
- Derbesia marina (Lyngbye) Solier
- Derbesiaceae
- Desdemona Banse, 1957
- Desdemona ornata Banse, 1957
- Deshayesorchestia Ruffo, 2004
- Desmarestia ligulata (Stackhouse) J.V.Lamouroux
- Desmarestia viridis (O.F.Müller) J.V.Lamouroux
- Devonia perrieri (Malard, 1904)
- Diadumene Stephenson, 1920
- Diadumene cincta Stephenson, 1925
- Diadumene lineata (Verrill, 1869)
- Diaphana Brown, 1827
- Diaphana minuta Brown, 1827
- Diaphanidae
- Diaphanoidea
- Diaphorodoris Iredale & O'Donoghue, 1923
- Diaphorodoris luteocincta (Sars, 1870)
- Diaptomoidea
- Diastylis Say, 1818
- Diastylis boecki Zimmer, 1930
- Diastylis goodsiri (Bell, 1855)
- Diastylis laevis Norman, 1869
- Diastylis rathkei subsp. belgica Zimmer
- Diastylis rathkei subsp. rathkei (Krøyer, 1841)
- Diastylis rugosa Sars, 1865
- Diastylis tumida (Liljeborg, 1855)
- Diastyloides Sars, 1900
- Diastyloides biplicatus (Sars, 1865)
- Dichelesthiidae
- Dicoryne conferta (Alder, 1856)
- Dicoryne conybeari (Allman, 1864)
- Dicranochaete Hieron.
- Didemnum candidum Savigny, 1816
- Didemnum maculosum (Milne Edwards, 1841)
- Dinobryaceae
- Dinophyceae
- Diogenes Dana, 1851
- Diphasia attenuata Hincks, 1866
- Diphasia fallax (Johnston, 1847)
- Diphasia nigra (Pallas, 1766)
- Diphasia rosacea (Linnaeus, 1758)
- Diplecogaster Fraser-Brunner, 1938
- Diplecogaster bimaculata (Bonnaterre, 1788)
- Diplocirrus Haase, 1915
- Diplocirrus glaucus (Malmgren, 1867)
- Diplodonta rotundata (Montagu, 1803)
- Dipolydora coeca (Ørsted, 1843)
- Dipolydora flava (Claparède, 1870)
- Dipolydora quadrilobata (Jacobi, 1883)
- Dipturus Rafinesque, 1810
- Dipturus batis (Linnaeus, 1758)
- Discidae
- Disparalona Fryer, 1968
- Disporella Gray, 1848
- Disporella hispida (Fleming, 1828)
- Ditrichocorycaeus Dahl, 1912
- Ditrupa Berkeley, 1835
- Ditrupa arietina (Müller, 1776)
- Dodecaceria concharum Ørsted, 1843
- Dodecaceria Ørsted, 1843
- Doridicola Leydig, 1853
- Dorididae
- Doridoidea
- Doris Linnaeus, 1758
- Doris pseudoargus Rapp, 1827
- Dosinia lupinus (Linnaeus, 1758)
- Doto Oken, 1815
- Doto dunnei Lemche, 1976
- Doto hydrallmaniae Morrow, Thorpe & Picton, 1992
- Doto maculata (Montagu, 1804)
- Doto pinnatifida (Montagu, 1804)
- Doto sarsiae Morrow, Thorpe & Picton, 1992
- Draparnaldia Bory
- Dreissena bugensis (Andrusov, 1897)
- Dreissenoidea
- Drilonereis Claparède, 1870
- Drilonereis filum (Claparède, 1868)
- Dromia Weber, 1795
- Dromia personata (Linnaeus, 1758)
- Dromiidae
- Dumontia J.V.Lamour.
- Dynamena pumila (Linnaeus, 1758)
- Dyopedos monacanthus (Metzger, 1875)
- Ebalia Leach, 1817
- Ebalia granulosa Milne Edwards, 1837
- Echinocardium flavescens (Müller, 1776)
- Echinogammarus obtusatus (Dahl, 1938)
- Echiura
- Echiura
- Echiuridae
- Echiuroidea
- Echiurus Guérin-Méneville, 1831
- Echiurus echiurus (Pallas, 1766)
- Eclysippe Eliason, 1955
- Eclysippe vanelli (Fauvel, 1936)
- Ecrobia Stimpson, 1865
- Ectinosomatidae
- Ectochaete J.Agardh
- Ectogeron P.A.Dang.
- Ectopleura dumortierii (Van Beneden, 1844)
- Ectopleura larynx (Ellis & Solander, 1786)
- Edmundsella Korshunova, Martynov, Bakken, Evertsen, Fletcher, Mudianta, Saito, Lundin, Schrödl & Picton, 2017
- Edwardsia Quatrefages, 1842
- Edwardsia claparedii (Panceri, 1869)
- Edwardsiidae
- Einhornia Nikulina, 2007
- Elachista scutulata (Smith) Areschoug
- Elasmognatha
- Elasmopus Costa, 1853
- Elasmopus rapax Costa, 1853
- Electra Lamouroux, 1816
- Electra monostachys (Busk, 1854)
- Electra pilosa (Linnaeus, 1767)
- Eleutheria dichotoma De Quatrefages, 1842
- Ellisolandia K.R.Hind & G.W.Saunders
- Ellobioidea
- Endeidae
- Endeis spinosa (Montagu, 1808)
- Endoderma Lagerh.
- Engraulis Cuvier, 1816
- Enidoidea
- Enipo Malmgren, 1866
- Enipo kinbergi Malmgren, 1866
- Ennucula Iredale, 1931
- Ennucula tenuis (Montagu, 1808)
- Enoplea
- Enoplidae
- Enoplus Dujardin, 1845
- Enoplus brevis Bastian, 1865
- Ensis magnus Schumacher, 1817
- Enteropneusta
- Enteropneusta [unassigned]
- Epilepton
- Epitonioidea
- Epitonium trevelyanum (Johnston, 1841)
- Ergasilidae
- Ericthonius difformis Milne Edwards, 1830
- Errantia
- Erythrocladia Rosenv.
- Erythroglossum J.Agardh
- Erythroglossum laciniatum (Lightfoot) Maggs & Hommersand
- Erythrops Sars, 1869
- Erythrops elegans (Sars, 1863)
- Erythrotrichia Aresch.
- Escharella Gray, 1848
- Escharella immersa (Fleming, 1828)
- Escharoides Milne Edwards, 1836
- Escharoides coccinea (Abildgaard, 1806)
- Esox Linnaeus, 1758
- Eteone Malmgren, 1865
- Eteone barbata Malmgren, 1865
- Eteone flava (Fabricius, 1780)
- Eteone longa (Fabricius, 1780)
- Eteone spetsbergensis Malmgren, 1865
- Eualus Thallwitz, 1891
- Eubranchus Forbes, 1838
- Eubranchus linensis Garcia-Gomez, Cervera & Garcia, 1990
- Eubranchus vittatus (Alder & Hanckock,1842)
- Eucheilota flevensis Van Kampen , 1922
- Eucheilota maculata Hartlaub, 1894
- Euchone Malmgren, 1866
- Euchone limnicola Reish, 1959
- Euchone rubrocincta (Sars, 1862)
- Euclymene Verrill, 1900
- Euclymene droebachiensis (Sars in Sars, 1871)
- Eucratea Lamouroux, 1812
- Eucratea loricata (Linnaeus, 1758)
- Eudendrium album Nutting, 1896
- Eudendrium arbuscala Wright, 1859
- Eudendrium rameum (Pallas, 1766)
- Eudendrium ramosum (Linnaeus, 1758)
- Eudendrium tenellum Allman, 1877
- Eudendrium vervoorti Marques & Migotto, 1998
- Eudorella Norman, 1867
- Eudorella emarginata (Krøyer, 1846)
- Eudorella truncatula (Bate, 1856)
- Eudorellopsis Sars, 1882
- Eudorellopsis deformis (Krøyer, 1846)
- Eugomontia Kornmann
- Eulalia Savigny, 1822
- Eulalia bilineata (Johnston, 1840)
- Eulalia mustela Pleijel, 1987
- Eulalia viridis (Linnaeus, 1767)
- Eulamellibranchia
- Eumida Malmgren, 1865
- Eumida bahusiensis Bergström, 1914
- Eumida sanguinea (Ørsted, 1843)
- Eumonostilifera Chernyshev, 2003
- Eunereis Malmgren, 1865
- Eunereis elitoralis Eliason, 1962
- Eunereis longissima Johnston, 1840
- Eunicidae
- Eunoe Malmgren, 1866
- Eunoe nodosa (Sars, 1861)
- Euphausiacea
- Euphausiidae
- Euphysa aurata Forbes, 1848
- Eupolymnia (Montagu, 1818)
- Eupolymnia nebulosa (Montagu, 1818)
- Eupulmonata
- Eurynome Leach, 1814
- Eurytemora affinis (Poppe, 1880)
- Eusarsiella Cohen & Kornicker, 1975
- Eusarsiella zostericola (Cushman, 1906)
- Euspira Agassiz in Sowerby, 1837
- Euspira montagui (Forbes, 1838)
- Euspira nitida (Donovan, 1804)
- Eusyllis Malmgren, 1867
- Eusyllis blomstrandi Malmgren, 1867
- Euterpinidae
- Eutima gegenbauri (Haeckel, 1864)
- Eutima gracilis (Forbes & Goodsir, 1853)
- Evadne spinifera Müller, 1867
- Exochellidae
- Exogone dispar (Webster, 1879)
- Exogone naidina Ørsted, 1845
- Exogone Örsted, 1845
- Fabricia Blainville, 1828
- Fabricia stellaris (Müller, 1774)
- Fabriciidae
- Fabulina Gray, 1851
- Fabulina fabula (Gmelin, 1791)
- Farrella Ehrenberg, 1838
- Farrella repens (Farre, 1837)
- Favorinus Gray, 1850
- Favorinus blianus Lemche & Thompson, 1974
- Faxonius Ortmann, 1905
- Fenestrulina Jullien, 1888
- Fenestrulina delicia Winston, Hayward & Craig, 2000
- Filellum serpens (Hassall, 1848)
- Filellum serratum (Clarke, 1879)
- Fimbriosthenelais minor (Pruvot & Racovitza, 1895)
- Fionidae
- Fionoidea
- Fissurelloidea
- Fjordia Korshunova, Martynov, Bakken, Evertsen, Fletcher, Mudianta, Saito, Lundin, Schrödl & Picton, 2017
- Flabelligera Sars, 1829
- Flabelligera affinis Sars, 1829
- Flabelligeridae
- Flabellina Gray, 1833
- Flabellinoidea
- Flustra Linnaeus, 1761
- Flustra foliacea (Linnaeus, 1758)
- Flustrellidra Bassler, 1953
- Flustrellidra hispida (Fabricius, 1780)
- Foraminifera
- Fredericella Gervais, 1838
- Fredericella sultana (Blumenbach, 1779)
- Fucus guiryi Zardi, Nicastro, E.S.Serrão & G.A.Pearson
- Gadus Linnaeus, 1758
- Gaillona Bonnemaison
- Gaillona gallica (Nägeli) Athanasiadis
- Gaillona hookeri (Dillwyn) Athanasiadis
- Galathea Fabricius, 1793
- Galathowenia Kirkegaard, 1959
- Galathowenia oculata (Zachs, 1923)
- Galeommatoidea
- Galeorhinus Blainville, 1816
- Gammarella Bate, 1857
- Gammarella fucicola (Leach, 1814)
- Gammarellus homari (Fabricius, 1779)
- Gammaropsis Lilljeborg, 1855
- Gammaropsis maculata (Johnston, 1828)
- Gammaropsis nitida (Stimpson, 1853)
- Gammaropsis palmata (Stebbing & Robertson, 1891)
- Gammarus insensibilis Stock, 1966
- Gammarus lacustris Sars, 1864
- Garveia franciscana (Torrey, 1902)
- Garveia nutans (Wright, 1859)
- Gastrochaenoidea
- Gastroclonium Kütz.
- Gastrodontoidea
- Gastrosaccus Norman, 1868
- Gattyana McIntosh, 1897
- Gattyana amondseni (Malmgren, 1867)
- Gattyana cirrhosa (Pallas, 1766)
- Gayliella T.O.Cho, L.J.McIvor & S.M.Boo
- Gayralia K.L.Vinogradova
- Gayralia oxysperma (Kützing) K.L.Vinogradova ex Scagel et al.
- Gayraliaceae
- Gelidium J.V.Lamour.
- Geminella Turpin
- Gibbomodiola Sacco, 1898
- Gibbula magus (Linnaeus, 1758)
- Gigartina Stackh.
- Gilvossius Manning & Felder, 1992
- Gilvossius tyrrhenus (Petagna, 1792)
- Gitanopsis Sars, 1892
- Gitanopsis inermis (Sars, 1883)
- Glabrotelson Huys in Kihara & Huys, 2009
- Gloeotila Kütz.
- Glossobalanus Spengel, 1893
- Glossobalanus marginatus Meek, 1922
- Glycera Savigny, 1818
- Glycera alba (Müller, 1776)
- Glycera capitata Örsted, 1843
- Glycera lapidum Quatrefages, 1865
- Glycera oxycephala Ehlers, 1887
- Glycera tesselata Grube, 1840
- Glycera tridactyla Schmarda, 1861
- Glycera unicornis Savigny in Lamarck, 1818
- Glyceridae
- Glycinde Müller, 1858
- Glycinde nordmanni (Malmgren, 1866)
- Glyphohesione Friedrich, 1950
- Glyphohesione klatti Friedrich, 1951
- Gnathostomula Ax, 1956
- Gnathostomula paradoxa Ax, 1956
- Gnathostomulidae
- Gobiesocidae
- Gobiesociformes
- Gobiosoma Girard, 1858
- Gobiosoma bosc (Lacepède, 1800)
- Gobius paganellus Linnaeus, 1758
- Golfingia Lankester, 1885
- Golfingia elongata (Keferstein, 1862)
- Golfingia vulgaris (de Blainville, 1827)
- Golfingiida
- Golfingiidae
- Gomontia Bornet & Flahault
- Goneplacidae
- Goneplax Leach, 1814
- Goneplax rhomboides (Linnaeus, 1758)
- Gongolaria baccata (S.G.Gmelin) Molinari & Guiry
- Gongrosira Kütz.
- Goniada Audouin & Milne-Edwards, 1833
- Goniada maculata Ørsted, 1843
- Goniadella Hartman, 1950
- Goniadella bobrezkii (Annenkova, 1929)
- Goniasteridae
- Gonionemus A. Agassiz, 1862
- Gonothyraea loveni (Allman, 1859)
- Gonyaulacaceae
- Gonyaulacales
- Gossea corynetes (Gosse, 1853)
- Gouldia minima (Montagu, 1803)
- Gracilaria Grev.
- Gracilariopsis E.Y.Dawson
- Gracilechinus Fell & Pawson in Moore, 1966
- Gracilechinus acutus (Lamarck, 1816)
- Grandidierella Coutière, 1904
- Grandidierella japonica Stephensen, 1938
- Grania postclitellochaeta (Knöllner, 1935)
- Grania variochaeta Erséus & Lasserre, 1976
- Grania vikinga Rota & Erseus, 2003
- Grateloupia C.Agardh
- Griffithsia C.Agardh
- Gymnammodytes Duncker & Mohr, 1935
- Gymnammodytes semisquamatus (Jourdain, 1879)
- Gymnodiniaceae
- Gymnodiniales
- Gymnodinium Stein
- Gymnodinium catenatum H.W.Graham
- Gyptis Marion & Bobretzky in Marion, 1874
- Gyptis rosea Marion, 1875
- Haematocelis J.Agardh
- Halammohydra coronata Clausen, 1967
- Halammohydra octopodides Remane, 1927
- Halammohydra vermiformis Swedmark & Teissier, 1957
- Halcampa Gosse, 1858
- Halcampa chrysanthellum (Peach in Johnston, 1847)
- Halcampidae
- Halecium beanii (Johnston, 1838)
- Halecium halecinum (Linnaeus, 1758)
- Halecium lankesterii (Bourne, 1890)
- Halecium muricatum (Ellis & Solander, 1786)
- Halecium nanum Alder, 1859
- Halecium sessile Norman, 1867
- Halecium tenellum Hincks, 1861
- Halectinosoma chrystalii (Scott, 1894)
- Haliclona Grant, 1836
- Haliclona cinerea (Grant, 1826)
- Haliclona simulans (Johnston, 1842)
- Haliclystus James-Clark, 1863
- Haliclystus auricula (Rathke, 1806)
- Haliclystus octoradiatus (Lamarck, 1816)
- Haliclystus salpinx Clark, 1863
- Halisarca (Johnston, 1842)
- Halisarca dujardinii (Johnston, 1842)
- Halocercus Baylis & Daubney, 1925
- Halocercus delphini Baylis & Daubney, 1925
- Halocercus invaginatus (Quekett, 1841)
- Halocercus taurica Delyamure, 1942
- Halochlorococcum P.J.L.Dang.
- Haloclavidae
- Halocynthia Verrill, 1879
- Halocynthia papillosa (Linnaeus, 1767)
- Halopithys Kütz.
- Halopteris catharina (Johnston, 1833)
- Halurus Kütz.
- Haminoea Turton & Kingston, 1830
- Haminoea japonica Pilsbry, 1895
- Haminoeidae
- Haminoeoidea
- Hanseniella oligomacrochaeta Scheller, 2002
- Hapalidiaceae
- Haploops Lilljeborg, 1856
- Haploops tubicola Liljeborg, 1856
- Haplosporida
- Haplosporiidae
- Harmothoe antilopes McIntosh, 1876
- Harmothoe clavigera Sars, 1863
- Harmothoe extenuata (Grube, 1840)
- Harmothoe fernandi Barnich & Fiege, 2009
- Harmothoe fragilis Moore, 1910
- Harmothoe glabra (Malmgren, 1866)
- Harmothoe impar (Johnston, 1839)
- Harpinia antennaria Meinert, 1890
- Harpinia crenulata (Boeck, 1871)
- Harpinia laevis Sars, 1891
- Harpinia serrata Sars, 1879
- Harrimania Ritter, 1900
- Harrimania kupfferi Willemoes-Suhm, 1871
- Hartlaubella gelatinosa (Pallas, 1766)
- Haustorius Müller, 1775
- Haustorius arenarius (Slabber, 1769)
- Hediste diversicolor (Müller, 1776)
- Heleobia Stimpson, 1865
- Heleobia stagnorum (Gmelin, 1791)
- Helicoidea
- Hemibdella Van Beneden & Hesse, 1863
- Hemibdella soleae Van Beneden & Hesse, 1863
- Hemichordata
- Hemicytheridae
- Hemigrapsus Dana, 1851
- Hemilamprops Sars, 1883
- Hemilamprops roseus (Norman, 1863)
- Hemilepton Cossmann, 1911
- Hemilepton nitidum (Turton, 1822)
- Hemimysis abyssicola Sars, 1869
- Hermania Monterosato, 1884
- Hermania scabra (Müller, 1784)
- Hermodice Kinberg, 1857
- Hermodice carunculata (Pallas, 1766)
- Hesionura Hartmann-Schröder, 1958
- Hesionura elongata (Southern, 1914)
- Heterodonta
- Heterodrilus Pierantoni, 1902
- Heterodrilus subtilis (Pierantoni, 1917)
- Heterolepidoderma Remane, 1927
- Heterolepidoderma armatum Schrom, 1966
- Heterolepidoderma marinum Remane, 1926
- Heteromysis Bacescu, 1968
- Heteromysis Smith, 1873
- Heteromysis formosa Smith, 1873
- Heteromysis microps (Sars G.O., 1877)
- Heteromysis microps (Sars, 1877)
- Heterosiphonia Mont.
- Heterotanais oerstedii (Krøyer, 1842)
- Hiatelloidea
- Hilbigneris Carrera-Parra, 2006
- Hilbigneris gracilis (Ehlers, 1868)
- Hildenbrandia Nardo
- Hippasteria Gray, 1840
- Hippasteria phrygiana (Parelius, 1768)
- Hippocampus hippocampus (Linnaeus, 1758)
- Hippolyte Leach, 1814
- Hippolyte leptocerus (Heller, 1863)
- Hippomedon Boeck, 1871
- Hippomedon denticulatus (Bate, 1857)
- Hippoporina Neviani, 1895
- Holothuroidea
- Hoplonemertea Hubrecht, 1879
- Hormathia Gosse, 1859
- Hormathia digitata (Müller, 1776)
- Hormathiidae
- Hornera Lamouroux, 1821
- Hornera lichenoides (Linnaeus, 1758)
- Horstkurtcaris Karanovic & Lee, 2012
- Hyale schmidti (Heller, 1866)
- Hyalinella Jullien, 1885
- Hyalinella punctata (Hancock, 1850)
- Hyas Leach, 1814
- Hybocodon prolifer Agassiz, 1862
- Hydra braueri (Bedot, 1912)
- Hydra circumcincta Schulze, 1914
- Hydra oligactis Pallas, 1766
- Hydra oxycnida Schulze, 1914
- Hydra vulgaris Pallas, 1766
- Hydrallmania falcata (Linnaeus, 1758)
- Hydrobia acuta (Draparnaud, 1805)
- Hydrobia acuta subsp. neglecta Muus, 1963
- Hydrodictyon Roth
- Hydroides Gunnerus, 1768
- Hygrophila
- Hypania Ostrooumouff, 1896
- Hypereteone Bergström, 1914
- Hypereteone foliosa (Quatrefages, 1865)
- Hyperia Latreille, 1823
- Hyperia galba (Montagu, 1815)
- Hyperiidae
- Hyperoplus immaculatus (Corbin, 1950)
- Hypoglossum Kütz.
- Hypophorella Ehlers, 1876
- Hypophorella expansa Ehlers, 1876
- Hypophorellidae
- Hysterothylacium rigidum (Rudolphi, 1809)
- Ianiropsis serricaudis Gurjanova, 1936
- Ictalurus Rafinesque, 1820
- Idotea balthica (Pallas, 1772)
- Imogine Girard, 1953
- Imogine necopinata Sluys, Faubel, Rajagopal & Van der Velde, 2005
- Inachidae
- Inachus Weber, 1795
- Incisocalliope Barnard, 1959
- Iphimedia minuta Sars, 1883
- Iphinoe Bate, 1856
- Iravadiidae
- Ischadium Jukes-Browne, 1905
- Ischnochitonidae
- Jaera nordmanni (Rathke, 1837)
- Jania J.V.Lamour.
- Jassa falcata (Montagu, 1808)
- Jorunna
- Kabatazus Özdikmen, 2008
- Karenia G.Hansen & Moestrup
- Karenia mikimotoi (Miyake & Kominami ex Oda) Gert Hansen & Ø.Moestrup
- Kareniaceae
- Katamysis Sars, 1893
- Katamysis warpachowskyi Sars, 1893
- Kelliidae
- Kentrogonida
- Khakista incertae sedis
- Kirchenpaueria pinnata (Linnaeus, 1758)
- Klebsormidium P.C.Silva, K.Mattox & W.H.Blackw.
- Knipowitschia Iljin, 1927
- Knipowitschia caucasica (Berg, 1916)
- Knoutsodonta Hallas & Gosliner, 2015
- Knoutsodonta pusilla (Alder & Hancock, 1845)
- Kroyeriidae
- Kryptodasys Todaro, Dal Zotto, Kånneby & Hochberg, 2019
- Kryptodasys remanei (Boaden, 1963)
- Kurtiella Gofas & Salas, 2008
- Labidoplax buskii (McIntosh, 1866)
- Labidoplax Östergren, 1898
- Lacerta bilineata Daudin, 1802
- Lacuna Turton, 1827
- Lacuna crassior (Montagu, 1803)
- Lacuna vincta (Montagu, 1803)
- Lafoea dumosa (Fleming, 1820)
- Lafoeina tenuis Sars, 1874
- Lagis Malmgren, 1866
- Lagis koreni Malmgren, 1866
- Lamellaria Montagu, 1816
- Lamellaria perspicua (Linnaeus, 1758)
- Laminaria hyperborea (Gunnerus) Foslie
- Lamna Cuvier, 1816
- Lampetra Bonnaterre, 1788
- Lampris Retzius, 1799
- Lamprops Sars, 1863
- Lanice Malmgren, 1866
- Laodicea Lesson, 1843
- Laodicea undulata (Forbes & Goodsir, 1853)
- Laodiceidae
- Laomedea angulata Hincks, 1861
- Laomedea calceolifera (Hincks, 1871)
- Laomedea exigua Sars, 1857
- Laomedea flexuosa Alder, 1857
- Laomedea neglecta Alder, 1856
- Laonice Malmgren, 1867
- Laonice bahusiensis Söderström, 1920
- Laonome Malmgren, 1866
- Laonome calida Capa, 2007
- Laurencia J.V.Lamour.
- Leiochone Grube, 1868
- Leitoscoloplos Day, 1977
- Leitoscoloplos mammosus Mackie, 1987
- Lepetellida Moskalev, 1971
- Lepidepecreum Bate & Westwood, 1868
- Lepidepecreum longicornis (Bate, 1862)
- Lepidochitona
- Lepidochitonidae
- Lepidochitoninae
- Lepidonotus clava (Montagu, 1808)
- Lepidopleurida
- Lepidopleurina
- Lepidorhombus boscii (Risso, 1810)
- Leptastacidae
- Leptasterias Verrill, 1866
- Leptasterias muelleri (Sars, 1846)
- Leptinogaster Pelseneer, 1929
- Leptocardii
- Leptocheirus hirsutimanus (Bate, 1862)
- Leptochelia Dana, 1849
- Leptochelia dubia Krøyer, 1842
- Leptochiton scabridus (Jeffreys, 1880)
- Lepton Turton, 1822
- Lepton squamosum (Montagu, 1803)
- Leptopentacta Clark, 1938
- Leptopentacta elongata (Düben & Koren, 1846)
- Leptosiphonia Kylin
- Leptosiphonia brodiei (Dillwyn) A.M.Savoie & G.W.Saunders
- Leptosiphonia fibrillosa (Agardh) A.M.Savoie & G.W.Saunders
- Leptosynapta Verrill, 1867
- Leptosynapta inhaerens (Müller, 1776)
- Lernaeidae
- Lernaeopodidae
- Lernanthropodidae
- Leuciscus aspius Linnaeus, 1758
- Leuckartiara octona Hartlaub, 1913
- Leuconidae
- Leucophytia Winckworth, 1949
- Leucophytia bidentata (Montagu, 1808)
- Leucoraja Malm, 1877
- Leucoraja circularis (Couch, 1838)
- Leucoraja naevus (Müller & Henle, 1841)
- Leucosolenia somesii (Bowerbank, 1874)
- Leucothoe lilljeborgi Boeck, 1861
- Leucothoe procera Bate, 1857
- Leucothoe richiardii Lesson, 1865
- Leucothoe spinicarpa (Abildgaard, 1789)
- Levinsenia Mesnil, 1897
- Levinsenia gracilis (Tauber, 1879)
- Lichomolgidae
- Limacoidea
- Limapontia depressa Alder & Hancock, 1862
- Limapontioidea
- Limaria Link, 1807
- Limecola Brown, 1844
- Limida
- Limnodriloides Erséus, 1982
- Limnodriloides scandinavicus Erséus, 1982
- Limnodriloidinae
- Limoidea
- Linguatula Fröhlich, 1789
- Linguatulidae
- Linguatuloidea
- Lithodes Latreille, 1806
- Lithodes maja (Linnaeus, 1758)
- Lithodidae
- Lithoglyphidae
- Lithoglyphus C. Pfeiffer, 1828
- Lithoglyptida
- Lithothamnion Heydr.
- Lithothamnion sonderi Hauck
- Littorina saxatilis (Olivi, 1792)
- Littorinimorpha
- Littorinoidea
- Lizzia blondina Forbes, 1848
- Lomanoticola T. & A. Scott, 1895
- Lomentaria Lyngb.
- Longipediidae
- Lophius Linnaeus, 1758
- Lophius budegassa Spinola, 1807
- Lophogaster Sars, 1857
- Lophogaster typicus Sars, 1857
- Lophogastrida
- Lophogastridae
- Lophopus Dumortier, 1835
- Lophopus crystallinus (Pallas, 1768)
- Lotidae
- Lottioidea
- Lovenella clausa (Lovén, 1836)
- Loxosoma Keferstein, 1862
- Loxosoma pectinaricola Franzén, 1962
- Loxosomatidae
- Loxosomella Mortensen, 1911
- Loxosomella compressa Nielsen & Ryland, 1961
- Loxosomella harmeri (Schultz, 1895)
- Loxosomella phascolosomata (Vogt, 1876)
- Lucinella divaricata (Linnaeus, 1758)
- Lucinida
- Lucinoidea
- Luidia Forbes, 1839
- Luidia sarsii Düben & Koren, in Düben, 1845
- Luidiidae
- Lumbricus friendi Cognetti, 1904
- Lumbrineridae
- Lumbrineris Blainville, 1828
- Lumbrineris cingulata (Ehlers, 1897)
- Lumbrineris latreilli Audouin & Milne-Edwards, 1834
- Lumbrineris tetraura (Schmarda, 1861)
- Lutraria angustior Philippi, 1844
- Lychaete J.Agardh
- Lychaete pellucida (Hudson) M.J.Wynne
- Lymnaeoidea
- Lyonsia Turton, 1822
- Lyonsia norwegica (Gmelin, 1791)
- Lyonsiidae
- Lysianassa ceratina (Walker, 1889)
- Lysilla Malmgren, 1866
- Lysilla loveni Malmgren, 1866
- Lysippe Malmgren, 1866
- Lytocarpia myriophyllum (Linnaeus, 1758)
- Macarorchestia Stock, 1989
- Macarorchestia remyi (Schellenberg, 1950)
- Macomangulus Nordsieck, 1969
- Macomangulus tenuis (Da Costa, 1778)
- Macrochironidae
- Macrodasyida
- Macrodasyidae
- Macrodasys Remane, 1924
- Macrodasys buddenbrocki Remane, 1924
- Macropodia Leach, 1814
- Macrouridae
- Macrourus Bloch, 1786
- Macrourus berglax Lacepède, 1801
- Mactroidea
- Maeotias marginata (Modeer, 1791)
- Maeridae
- Magallana Salvi & Mariottini, 2016
- Magelona Müller, 1858
- Magelona alleni Wilson, 1958
- Magelona filiformis Wilson, 1959
- Magelona johnstoni Fiege, Licher & Mackie, 2000
- Magelona mirabilis (Johnston, 1865)
- Magelona papillicornis Müller, 1858
- Magelonidae
- Maja Lamarck, 1801
- Malacoceros Quatrefages, 1843
- Malacoceros fuliginosus (Claparède, 1869)
- Malacoceros tetracerus (Schmarda, 1861)
- Malmgrenia McIntosh, 1874
- Malmgrenia andreapolis McIntosh, 1874
- Malmgrenia castanea (McIntosh, 1876)
- Malmgrenia darbouxi (Pettibone, 1993)
- Malmgrenia ljungmani (Malmgren, 1867)
- Malmgrenia lunulata (Delle Chiaje, 1830)
- Malmgrenia marphysae (McIntosh, 1876)
- Malmgrenia mcintoshi (Tebble & Chambers, 1982)
- Malmgreniella Hartman, 1967
- Mangeliidae
- Marenzelleria Mesnil, 1896
- Marenzelleria viridis (Verrill, 1873)
- Margelopsis haeckelii (Hartlaub, 1897)
- Marphysa Quatrefages, 1865
- Marphysa bellii (Audouin & Milne Edwards, 1833)
- Marphysa sanguinea (Montagu, 1815)
- Marstoniopsis Van Regteren Altena, 1936
- Mastocarpus Kütz.
- Mastocarpus stellatus (Stachk. in With.) Guiry in Guiry et al
- Maurolicus Cocco, 1838
- Maxmuelleria Bock, 1942
- Maxmuelleria lankesteri (Herdman, 1898)
- Medicorophium Bousfield & Hoover, 1997
- Medicorophium affine (Bruzelius, 1859)
- Mediomastus Hartman, 1944
- Mediomastus fragilis Rasmussen, 1973
- Mediopyxis Medlin & Kühn, 2006
- Mediopyxis helysia Kühn, Hargreaves & Halliger, 2006
- Megamphopus Norman, 1869
- Megamphopus cornutus Norman, 1869
- Meganyctiphanes Holt & Tattersall, 1905
- Meganyctiphanes norvegica (Sars, 1857)
- Melanella Bowdich, 1822
- Melanella alba (da Costa, 1778)
- Melanella lubrica (Monterosato, 1890)
- Melanothamnus Bornet & Falkenberg
- Melanothamnus harveyi (Bailey) Díaz-Tapia & Maggs
- Melicertum octocostatum (Sars, 1835)
- Melinna Malmgren, 1866
- Melinna palmata Grube, 1870
- Melita dentata (Krøyer, 1842)
- Melobesia J.V.Lamour.
- Melphidippella Sars, 1894
- Melphidippella macra (Norman, 1869)
- Melphidippidae
- Membranipora de Blainville, 1830
- Membranipora membranacea (Linnaeus, 1767)
- Membranoptera Stackh.
- Menigrates Boeck, 1871
- Menigrates obtusifrons (Boeck, 1861)
- Merluccius Rafinesque, 1810
- Mesophyllum Me.Lemoine
- Metidae
- Metopa Boeck, 1871
- Metopa alderi (Bate, 1857)
- Metopa borealis Sars, 1882
- Metopa bruzelii (Goës, 1866)
- Metopa rubrovittata Sars, 1883
- Metridia Boeck, 1865
- Metridinidae
- Metridium dianthus (Linnaeus, 1761)
- Micrenophrys Andriashev, 1954
- Micrenophrys lilljeborgii (Collett, 1875)
- Microchlamylla Korshunova, Martynov, Bakken, Evertsen, Fletcher, Mudianta, Saito, Lundin, Schrödl & Picton, 2017
- Microchlamylla gracilis (Alder & Hancock, 1844)
- Micromaldane Monro, 1939
- Micromaldane ornithochaeta Mesnil, 1897
- Microphthalmus Mecznikow, 1865
- Microphthalmus aberrans (Webster et Benedict, 1887)
- Microphthalmus fragilis Bobretzky, 1870
- Microphthalmus listensis Westheide, 1967
- Microphthalmus sczelkowii Mecznikow, 1865
- Microplana Vejdovsky, 1889
- Microporella Hincks, 1877
- Microporella ciliata (Pallas, 1766)
- Microspora Thur.
- Microthamnion Nägeli
- Mimachlamys Iredale, 1929
- Mimachlamys varia (Linnaeus, 1758)
- Miraciidae
- Mitrocomella brownei (Kramp, 1930)
- Modiolula phaseolina (Philippi, 1844)
- Moerella Fischer, 1887
- Moerisia inkermanica Paltschikowa-Ostroumova, 1925
- Moerisia lyonsi Boulenger, 1908
- Molgula Forbes, 1848
- Molgula complanata Alder & Hancock, 1870
- Molgula occulta Kupffer, 1875
- Molgula oculata Forbes, 1848
- Molva Lesueur, 1819
- Molva dypterygia (Pennant, 1784)
- Monia Gray, 1850
- Monocorophium Bousfield & Hoover, 1997
- Monocorophium uenoi (Stephensen, 1932)
- Monoculodes Stimpson, 1853
- Monoculodes carinatus (Bate, 1857)
- Monopseudocuma McCarthy & Gerken, 2006
- Monopseudocuma gilsoni (Gilson, 1906)
- Monopylephorus parvus Ditlevsen, 1904
- Monopylephorus rubroniveus Levinsen, 1884
- Monosporus Solier
- Monostilifera Brinkmann, 1917
- Monostroma Thur.
- Monstrillidae
- Monstrilloida
- Montacuta Turton, 1822
- Montacuta substriata (Montagu, 1808)
- Montacutidae
- Mopalioidea
- Mougeotia C.Agardh
- Mougeotiopsis Palla
- Mulinia Gray, 1837
- Mulinia lateralis (Say, 1822)
- Mullus barbatus Linnaeus, 1758
- Murchisonella Mörch, 1875
- Murchisonellidae
- Murchisonelloidea
- Muricoidea
- Musculus subpicta (Cantraine, 1835)
- Musculus subpictus (Cantraine, 1835)
- Mustelus Linck, 1790
- Mycale macilenta (Bowerbank, 1866)
- Myctophidae
- Myctophiformes
- Myctophum Rafinesque, 1810
- Myctophum punctatum Rafinesque, 1810
- Myodocopida
- Myoidea
- Myopsida
- Myriactula rivulariae (Suhr ex Aresch.) Feldmann
- Myrianida Milne Edwards, 1845
- Myrianida brachycephala (Marenzeller, 1874)
- Myrianida edwardsi (Saint-Joseph, 1887)
- Myrianida langerhansi (Gidholm, 1967)
- Myrianida prolifera (Müller, 1788)
- Myriochele Malmgren, 1867
- Myriochele danielsseni Hansen, 1878
- Myriochele heeri Malmgren, 1867
- Myrionema Grev.
- Myrionema amboinense Pictet, 1893
- Myrionema grateloupiae Noda
- Myrtea Turton, 1822
- Myrtea spinifera (Montagu, 1803)
- Mysta Malmgren, 1865
- Mysta picta (Quatrefagues, 1865)
- Mytilida
- Mytiloidea
- Myxicola Koch in Renier, 1847
- Myxilla Schmidt, 1862
- Myxilla rosacea (Lieberkühn, 1859)
- Myxillidae
- Myxine Linnaeus, 1758
- Myxobolidae
- Myxobolus Bütschli, 1882
- Myxosporea
- Myzozoa
- Nannastacidae
- Nannastacus Bate, 1865
- Nannastacus brevicaudatus Calman, 1905
- Nannopodidae
- Nannosquillidae
- Naticoidea
- Neanthes Kinberg, 1865
- Neanthes fucata (Savigny in Lamarck, 1818)
- Nebalia Leach, 1814
- Nebaliidae
- Necora Holthuis, 1987
- Nemacheilidae
- Nemalion Duby
- Nemastomatales
- Nemertesia antennina (Linnaeus, 1758)
- Nemertesia ramosa (Lamarck, 1816)
- Nemopsis bachei (Agassiz, 1849)
- Neoamphitrite Hessle, 1917
- Neoamphitrite affinis (Malmgren, 1866)
- Neoamphitrite figulus (Dalyell, 1853)
- Neodasyidae
- Neodasys Remane, 1927
- Neodasys chaetonotoideus Remane, 1927
- Neodexiospira Pillai, 1970
- Neogastropoda
- Neogastropoda
- Neogobius kessleri (Gunther, 1861)
- Neosiphonia M.S.Kim & I.K.Lee
- Nephasoma Pergament, 1946
- Nephasoma eremita (Sars, 1851)
- Nephasoma minutum (Keferstein, 1862)
- Nephrops Leach, 1814
- Nephtys Cuvier, 1817
- Nephtys assimilis Ørsted, 1843
- Nephtys hystricis McIntosh, 1900
- Nephtys incisa Malmgren, 1865
- Nephtys kersivalensis McIntosh, 1908
- Nephtys pente Rainer, 1984
- Nereimyra Blainville, 1828
- Nereimyra punctata (Müller, 1788)
- Nereis Linnaeus, 1758
- Nereis fucata (Savigny in Lamarck, 1818)
- Nereis pelagica Linnaeus, 1758
- Neritimorpha
- Neritoidea
- Nicomache Malmgren, 1865
- Nicomache lumbricalis (Fabricius, 1780)
- Nicothoidae
- Nitella C.Agardh
- Nitellopsis Hy
- Nitophyllum Grev.
- Nitophyllum stellato-corticatum Okamura
- Noetiidae
- Nolella Gosse, 1851
- Nolella pusilla (Hincks, 1880)
- Notodelphyidae
- Notomastus Sars, 1850
- Notomastus latericeus Sars, 1851
- Nototropis Costa, 1853
- Nototropis swammerdamei (Milne-Edwards, 1830)
- Nototropis vedlomensis Bate & Westwood, 1863
- Nucula hanleyi Winckworth, 1931
- Nucula nucleus (Linnaeus, 1758)
- Nucula sulcata Bronn, 1831
- Nuculanida
- Nuculanoida
- Nuculanoidea
- Nuculida
- Nuculoidea
- Nudibranchia
- Nuuanuidae
- Nyctiphanes Sars, 1883
- Nyctiphanes couchii (Bell, 1853)
- Nymphon brevirostre Hodge, 1863
- Obelia bidentata (Clark, 1875)
- Obelia dichotoma (Linnaeus, 1758)
- Obelia geniculata (Linnaeus, 1758)
- Obelia longissima (Pallas, 1766)
- Obesogammarus crassus (Sars, 1894)
- Ochrophyta
- Ocinebrellus inornata (Récluz, 1851)
- Octopodiformes
- Odessia maeotica (Ostroumoff, 1896)
- Odontosyllis Claparède, 1863
- Odontosyllis ctenostoma Claparède, 1868
- Odostomia turrita Hanley, 1844
- Oedogonium Link ex Hirn
- Oegopsida
- Oenonidae
- Oerstediidae Chernyshev, 1993
- Oestophora Hesse, 1907
- Oestophora barbula (Rossmässler, 1838)
- Ogmogaster Jägerskiöld, 1891
- Oligoarthra
- Olindiidae
- Omalogyroidea
- Ommastrephes bartramii (Lesueur, 1821)
- Ommastrephes caroli (Furtado, 1887)
- Ommastrephes d'Orbigny, 1835
- Onchidoridoidea
- Ondina de Folin, 1870
- Ondina divisa (Adams, 1797)
- Onoba aculeus (Gould, 1841)
- Opercularella lacerata (Johnston, 1847)
- Ophelia Savigny, 1822
- Ophelia borealis Quatrefages, 1866
- Ophelia limacina (Rathke, 1843)
- Ophelia neglecta Schneider, 1892
- Ophelia rathkei McIntosh, 1908
- Opheliidae
- Ophelina acuminata Ørsted, 1843
- Ophelina modesta Støp-Bowitz, 1958
- Ophelina Ørsted, 1843
- Ophiactidae
- Ophiactis Lütken, 1856
- Ophiactis virens (Sars, 1857)
- Ophiocten Lütken, 1855
- Ophiocten affinis (Lütken, 1858)
- Ophiura sarsii Lütken, 1855
- Ophryotrocha Claparède & Mecznikow, 1869
- Ophryotrocha gracilis Huth, 1933
- Ophryotrocha puerilis Claparède et Metschnikow, 1869
- Opisthobranchia
- Orbinia Quatrefages, 1865
- Orbinia armandi (McIntosh, 1910)
- Orbinia latreillii (Audouin & Milne Edwards, 1833)
- Orbinia sertulata (Savigny, 1820)
- Orbiniidae
- Orchomene Boeck, 1871
- Orchomene humilis (Costa, 1853)
- Orchomenella Sars, 1890
- Orchomenella minuta (Krøyer, 1846)
- Orthopyxis integra (MacGillivray, 1842)
- Oscarella Vosmaer, 1884
- Oscarella lobularis (Schmidt, 1862)
- Osmerus Linnaeus, 1758
- Osmundea Stackh.
- Osmundea pinnatifida (Hudson) Stackhouse
- Ostreida
- Ostreoidea
- Othomaera Krapp-Schickel, 2000
- Othomaera othonis (Milne Edwards, 1830)
- Ovulidae
- Owenia Delle Chiaje, 1844
- Owenia borealis Koh, Bhaud & Jirkov, 2003
- Owenia fusiformis Delle Chiaje, 1844
- Oweniidae
- Oxydromus (Delle Chiaje, 1827)
- Pachycordyle Weismann, 1883
- Pacificincola Liu & Liu, 1999
- Pacificincola perforata (Okada & Mawatari, 1937)
- Pagellus erythrinus (Linnaeus, 1758)
- Pagurus Fabricius, 1775
- Pagurus forbesii Bell, 1846
- Pagurus prideaux Leach, 1815
- Pagurus pubescens Krøyer, 1838
- Palaeonemertea Hubrecht, 1879
- Palinurus Weber, 1795
- Palmaria Stackh.
- Palmodictyon Kütz.
- Paludicella Gervais, 1836
- Paludicella articulata (Ehrenberg, 1831)
- Pandalina Calman, 1899
- Pandalus Leach, 1814
- Pandalus borealis Krøyer, 1838
- Pandaridae
- Pandoroidea
- Panolicella Jebram, 1985
- Panolicella nutans Jebram, 1985
- Panomya Gray, 1857
- Panomya norvegica (Spengler, 1793)
- Parabrachiella Wilson, 1915
- Paracalanidae
- Paracalanus Boeck, 1865
- Paracicerina Meixner, 1928
- Paracicerina maristoi Karling, 1952
- Parahaustorius Bousfield, 1971
- Parajassa Stebbing, 1899
- Parajassa pelagica (Leach, 1814)
- Parakontikia Winsor, 1991
- Parakontikia ventrolineata (Dendy, 1892)
- Paramesochridae
- Paramphilochoides Lincoln, 1979
- Paramphilochoides odontonyx (Boeck, 1871)
- Paramphinome Sars, 1869
- Paramysis Czerniavsky, 1882
- Paramysis arenosa (Sars, 1877)
- Paramysis helleri (Sars, 1877)
- Paraonidae
- Paraonis Cerruti, 1909
- Paraonis fulgens (Levinsen, 1884)
- Parapleustes Buchholz, 1874
- Parapleustes assimilis (Sars, 1882)
- Parapleustes bicuspis (Krøyer, 1838)
- Parapontellidae
- Parasagitta Tokioka, 1965
- Parasagitta setosa (Müller, 1847)
- Paraturbanella Remane, 1927
- Paraturbanella teissieri Swedmark, 1954
- Parexogone Mesnil & Caullery, 1918
- Parexogone hebes (Webster et Benedict, 1884)
- Pariambus Stebbing, 1888
- Pariambus typicus (Krøyer, 1884)
- Parmacelloidea
- Parougia eliasoni (Oug, 1978)
- Parthenina Bucquoy, Dautzenberg & Dollfus, 1883
- Parthenina indistincta (Montagu, 1808)
- Parthenopea Kossmann, 1874
- Parthenopea subterranea Kossmann, 1874
- Parvicardium minimum (Philippi, 1836)
- Parvicardium pinnulatum (Conrad, 1831)
- Parvicardium scabrum (Philippi, 1844)
- Patella depressa Pennant, 1777
- Patella pellucida Linnaeus, 1758
- Patelloidea
- Peachia Gosse, 1855
- Peachia cylindrica (Reid, 1848)
- Pectinaria Lamarck, 1818
- Pectinaria belgica (Pallas, 1766)
- Pectinariidae
- Pectinatella Leidy, 1852
- Pectinatella magnifica (Leidy, 1851)
- Pectinida
- Pectinidae
- Pectinodrilus Erséus, 1992
- Pectinodrilus rectisetosus (Erséus, 1979)
- Pectinoidea
- Pedicellina nutans Dalyell, 1848
- Pegusa Günther, 1862
- Pelagia Péron & Lesueur, 1810
- Pelagia noctiluca (Forskål, 1775)
- Pelonaia Forbes & Goodsir, 1841
- Pelonaia corrugata Goodsir & Forbes, 1841
- Peltidiidae
- Peltogastridae
- Pennatula Linnaeus, 1758
- Pennatula phosphorea Linnaeus, 1758
- Pennatulacea
- Pennatulidae
- Pennella balaenoptera Koren & Danielsen, 1877
- Pennella filosa (Linnaeus, 1758)
- Pennellidae
- Pentastomida
- Percursaria Bory de Saint-Vincent
- Percursaria percursa (C.Agardh) Rosenvinge
- Perforatus Pitombo, 2004
- Perinereis Kinberg, 1865
- Perinereis cultrifera (Grube, 1840)
- Pestarella Ngoc-Ho, 2003
- Petalosarsia Stebbing, 1863
- Petalosarsia declivis (Sars, 1865)
- Petrocelis Kütz.
- Petromyzon Linnaeus, 1758
- Peyssonnelia Decne.
- Phaeothamniales
- Phallodrilus Pierantoni, 1902
- Phallodrilus parthenopaeus Pierantoni, 1902
- Pharus Gray, 1840
- Pharus legumen (Linnaeus, 1758)
- Phascolion Théel, 1875
- Phascolion strombus (Montagu, 1804)
- Phasianellidae
- Phasianelloidea
- Pherusa Oken, 1807
- Pherusa plumosa (Müller, 1776)
- Phialella quadrata (Forbes, 1848)
- Philine catena (Montagu, 1803)
- Philine punctata (Adams, 1800)
- Philinoidea
- Philocheras Stebbing, 1900
- Philocheras bispinosus (Hailstone, 1835)
- Philocheras fasciatus (Risso, 1816)
- Philocheras trispinosus (Hailstone, 1835)
- Pholadoidea
- Pholas Linnaeus, 1758
- Pholas dactylus Linnaeus, 1758
- Pholoe Johnston, 1839
- Pholoe assimilis Örsted, 1845
- Pholoe baltica Ørsted, 1843
- Pholoe inornata Johnston, 1839
- Pholoe minuta (Fabricius, 1780)
- Pholoe pallida Chambers, 1985
- Pholoidae
- Phoronis Wright, 1856
- Phoronis muelleri Selys-Lonchamps, 1903
- Phoronis psammophila Cori, 1889
- Photidae
- Photis longicaudata (Bate & Westwood, 1862)
- Phoxocephalus Stebbing, 1888
- Phoxocephalus holbolli (Krøyer, 1842)
- Phragmophora
- Phthisica
- Phtisica Slabber, 1769
- Phtisica marina Slabber, 1769a
- Phycidae
- Phycis Artedi in Walbaum, 1792
- Phycis blennoides (Brünnich, 1768)
- Phycis phycis (Linnaeus, 1766)
- Phycodrys Kütz.
- Phyllodoce groenlandica Ørsted, 1842
- Phyllodoce laminosa Savigny in Lamarck, 1818
- Phyllodoce lineata (Claparède, 1870)
- Phyllodoce maculata (Linnaeus, 1767)
- Phyllodoce mucosa Ørsted, 1843
- Phyllodoce rosea (McIntosh, 1877)
- Phyllodoce Örsted, 1842
- Phyllodocidae
- Phyllophora Grev.
- Phyllophoridae
- Phymatolithon Foslie
- Phymatolithon laevigatum (Foslie) Foslie
- Pilargidae
- Pilidiophora Thollesson & Norenburg, 2003
- Pilumnus Leach, 1816
- Pinnotheres Bosc, 1801
- Pirimela Leach, 1816
- Pirodrilus Erséus, 1992
- Pirodrilus minutus (Hrabĕ, 1973)
- Pisidia Leach, 1820
- Pisione Grube, 1857
- Pisione remota (Southern, 1914)
- Pista Malmgren, 1866
- Pista cristata (Müller, 1776)
- Pistella Hartmann-Schröder, 1996
- Pistella lornensis (Pearson, 1969)
- Plagioecia Canu, 1918
- Plagioecia patina Lamarck, 1816
- Plakobranchoidea
- Planes Bowdich, 1825
- Planorboidea
- Planosiphon McDevit & G.W.Saunders
- Planosiphon filiformis (Batters) Santiañez & Kogame
- Platybdella Malm, 1863
- Platycyamus Lütken, 1870
- Platynereis Kinberg, 1865
- Platynereis dumerilii (Audouin et Milne-Edwards, 1833)
- Platysquilla Manning, 1967
- Platysquilla eusebia (Risso, 1816)
- Pleioplana Faubel, 1983
- Pleioplana atomata (Müller, 1776)
- Pleurodasys Remane, 1927
- Pleurodasys megasoma Boaden, 1963
- Pleustidae
- Pleusymtes Barnard, 1969
- Pleusymtes glaber (Boeck, 1861)
- Plocamium J.V.Lamour.
- Plumaria F.Schmitz
- Plumatella Lamarck, 1816
- Plumatella emarginata Allman, 1844
- Plumatella fruticosa Allman, 1844
- Plumatella fungosa (Pallas, 1768)
- Plumatella repens (Linnaeus, 1758)
- Plumularia setacea (Linnaeus, 1758)
- Pneophyllum Kütz.
- Podarkeopsis Laubier, 1961
- Podarkeopsis capensis (Day, 1963)
- Podarkeopsis helgolandicus (Hilbig & Dittmer, 1979)
- Podocoryne carnea (Sars, 1846)
- Pododesmus Philippi, 1837
- Poecilochaetidae
- Poecilochaetus Claparède in Ehlers, 1875
- Poecilochaetus serpens Allen, 1904
- Polititapes Chiamenti, 1900
- Polititapes aureus (Gmelin, 1791)
- Polyarthra
- Polycarpa Heller, 1877
- Polycarpa scuba Monniot, 1971
- Polycarpa tenera Lacaze-Duthiers & Delage, 1892
- Polyceroidea
- Polychaeta incertae sedis
- Polycirrus Grube, 1850
- Polycirrus medusa Grube, 1850
- Polydora colonia Moore, 1907
- Polydora cornuta Bosc, 1802
- Polygordiidae
- Polygordius Schneider, 1868
- Polygordius appendiculatus Fraipont, 1887
- Polyides C.Agardh
- Polyphysia Quatrefages, 1866
- Polyphysia crassa (Ørsted, 1843)
- Polysiphonia Grev.
- Polysiphonia scopulorum Harv.
- Pomatoceros Philippi, 1844
- Pontellidae
- Ponticola Iljin, 1927
- Pontobdella Leach, 1815
- Pontobdella muricata (Linnaeus, 1758)
- Pontobdella vosmaeri (Apàthy, 1888)
- Pontocrates arcticus Sars, 1895
- Pontophilus Leach, 1817
- Pontophilus norvegicus (Sars, 1861)
- Porcellana Lamarck, 1801
- Porocephalida
- Porochloris Pascher
- Porphyra C.Agardh
- Porphyrodiscus Fr.
- Porphyrostromium Trevis.
- Portumnus Leach, 1814
- Potamocorbula Habe, 1955
- Potamocorbula amurensis (Schrenck, 1861)
- Prasiola Menegh.
- Pringsheimiella P.Crouan & H.Crouan
- Prionace Cantor, 1849
- Prionace glauca (Linnaeus, 1758)
- Prionospio Malmgren, 1867
- Prionospio cirrifera Wirén, 1883
- Prionospio multibranchiata Berkeley, 1927
- Prionospio steenstrupi Malmgren, 1867
- Procambarus Ortmann, 1905
- Procerastea Langerhans, 1884
- Procerastea nematodes Langerhans, 1884
- Processa Leach, 1815
- Processa canaliculata Leach, 1815
- Processa edulis subsp. crassipes Nouvel & Holthuis, 1957
- Processa nouveli subsp. holthuisi Al-Adhub & Williamson, 1975
- Processa parva Holthuis, 1951
- Proctonotidae
- Proleptus Dujardin, 1845
- Proleptus obtusus Dujardin, 1845
- Propebela Iredale, 1918
- Prorocentraceae
- Prorocentrales
- Prorocentrum Ehrenb.
- Prorocentrum triestinum J.Schiller
- Prosphaerosyllis San Martín, 1984
- Prosphaerosyllis tetralix (Eliason, 1920)
- Prostomatidae Bürger, 1904
- Protobranchia
- Protodorvillea Pettibone, 1961
- Protodorvillea kefersteini (McIntosh, 1869)
- Protodriloides Jouin, 1966
- Protodriloides chaetifer (Remane, 1926)
- Protodriloididae
- Protohalopteris Draisma, Prud'homme & H.Kawai
- Protohydra leuckarti Greeff, 1870
- Protosuberites epiphytum (Lamarck, 1815)
- Protula Risso, 1826
- Psamathe Johnston, 1836
- Psamathe fusca Johnston, 1836
- Psammamphiporus Gibson, 1989
- Psammodrilidae
- Psammodrilus Swedmark, 1952
- Psammodrilus balanoglossoides Swedmark, 1952
- Pseudalius Dujardin, 1845
- Pseudalius inflexus (Rudolphi, 1808)
- Pseudallidae
- Pseudamussium Mörch, 1853
- Pseudamussium peslutrae (Linnaeus, 1771)
- Pseudanthessiidae
- Pseudendoclonium Wille
- Pseudocalanus Boeck, 1873
- Pseudoceros maximum Lang, 1884
- Pseudocuma Sars, 1865
- Pseudodiaptomidae
- Pseudodiaptomus Herrick, 1884
- Pseudodiaptomus marinus Sato, 1913
- Pseudomystides Bergström, 1914
- Pseudomystides limbata (Saint-Joseph, 1888)
- Pseudopolydora Czerniavsky, 1881
- Pseudopolydora paucibranchiata (Okuda, 1937)
- Pseudopotamilla Bush, 1905
- Pseudopotamilla reniformis (Bruguière, 1789)
- Pseudoprotella Mayer, 1890
- Pseudotachidiidae
- Pteriomorphia
- Pterosiphonia Falkenb.
- Pterothamnion Nägeli
- Ptilohyale Bousfield & Hendrycks, 2002
- Ptilohyale littoralis (Stimpson, 1853)
- Ptilota C.Agardh
- Ptilothamnion Thur.
- Ptychoderidae
- Punctoidea
- Pupilloidea
- Pusa hispida (Schreber, 1775)
- Pycnogonum litorale (Ström, 1762)
- Pyramidelloidea
- Pyrgiscus Philippi, 1841
- Pyropia J.Agardh
- Pyuridae
- Radiofilum Schmidle
- Raja Linnaeus, 1758
- Raja undulata Lacepède, 1802
- Rajella Stehmann, 1970
- Rajella fyllae (Lütken, 1887)
- Rangia cuneata (Sowerby, 1832)
- Rapana Schumacher, 1817
- Rapana venosa (Valenciennes, 1846)
- Rathkea octopunctata (Sars, 1835)
- Regalecus Ascanius, 1772
- Reighardia Ward, 1899
- Reighardiida
- Reighardiidae
- Reinhardtius Gill, 1861
- Reinhardtius hippoglossoides (Walbaum, 1792)
- Retusa umbilicata (Montagu, 1803)
- Rhizocaulus verticulatus (Linnaeus, 1758)
- Rhizocephala
- Rhizoclonium Kütz.
- Rhizostoma Cuvier, 1800
- Rhizostoma octopus (Linnaeus, 1758)
- Rhizostoma pulmo (Macri, 1778)
- Rhodine Malmgren, 1865
- Rhodine gracilior Tauber, 1879
- Rhodine loveni Malmgren, 1865
- Rhodochorton Nägeli
- Rhodomela C.Agardh
- Rhodophyllis Kütz.
- Rhodophysema Batters
- Rhodothamniella Feldmann
- Rhodymenia Grev.
- Rhynchodemus sylvaticus (Leidy, 1851)
- Riseriellus occultus Rogers, Junoy, Gibson & Thorpe, 1993
- Rissoa membranacea (Adams, 1800)
- Rissoa parva (da Costa, 1778)
- Rissoides Manning & Lewinsohn, 1982
- Rissoides desmaresti (Risso, 1816)
- Rissooidea
- Rocellaria Blainville, 1828
- Rosenvingiella P.C.Silva
- Rostroraja Hulley, 1972
- Rostroraja alba (Lacepède, 1803)
- Rubramoena Cella, Carmona, Ekimova, Chichvarkhin, Schepetov & Gosliner, 2016
- Ruditapes philippinarum (Adams & Reeve, 1850)
- Sabella Linnaeus, 1767
- Sabellaria Lamarck, 1818
- Sabelliphilus Sars, 1862
- Saccharina Stackh.
- Saccoglossus Schimkewitsch, 1892
- Saccoglossus horsti Brambell & Goodhart, 1941
- Sacculina Thompson, 1836
- Sacculina carcini Thompson, 1836
- Sacculinidae
- Sacoglossa
- Sagartia Gosse, 1855
- Sagartia ornata (Holdsworth, 1855)
- Sagartia troglodytes (Price in Johnston, 1847)
- Sagartiogeton Carlgren, 1924
- Sagittidae
- Sagittoidea
- Sahlingia Kornmann
- Salmo Linnaeus, 1758
- Salvatoria McIntosh, 1885
- Salvatoria alvaradoi (San Martín, 1984)
- Salvatoria limbata (Claparède, 1868)
- Sardina Antipa, 1904
- Sarsamphiascus Huys, 2009
- Sarsia lovenii (Sars, 1846)
- Sarsia tubulosa (Sars, 1835)
- Sarsiellidae
- Scalibregma Rathke, 1843
- Scalibregma inflatum Rathke, 1843
- Scalibregmatidae
- Scaphander Montfort, 1810
- Scaphander lignarius (Linnaeus, 1758)
- Scaphandridae
- Scaphopoda
- Schistomysis Norman, 1892
- Schizobrachiella Canu & Bassler, 1920
- Schizobrachiella verrilli (Maturo & Schopf, 1968)
- Schizomavella Canu & Bassler, 1917
- Schizomavella linearis (Hassall, 1841)
- Schizoporella Hincks, 1877
- Schizotricha frutescens (Ellis & Solander, 1786)
- Schizymenia J.Agardh
- Schizymeniaceae
- Scolecida
- Scolelepis Blainville, 1828
- Scolelepis bonnieri (Mesnil, 1896)
- Scolelepis foliosa (Audouin & Milne-Edwards, 1833)
- Scolelepis korsuni Sikorski, 1994
- Scolelepis squamata (Müller, 1806)
- Scolelepis tridentata (Southern, 1914)
- Scoletoma Blainville, 1828
- Scoletoma fragilis (Müller, 1776)
- Scoletoma tetraura (Schmarda, 1861)
- Scoloplos Blainville, 1828
- Scopelocheiridae
- Scopelocheirus Bate, 1856
- Scopelocheirus hopei (Costa, 1851)
- Scophthalmus maximus (Linnaeus, 1758)
- Scottomyzontidae
- Scrobicularia
- Scruparia Oken, 1815
- Scruparia ambigua (d'Orbigny, 1841)
- Scruparia chelata (Linnaeus, 1758)
- Scrupocellaria Van Beneden, 1845
- Scrupocellaria scruposa (Linnaeus, 1758)
- Scutocyamus Lincoln & Hurley, 1974
- Scyliorhinus Blainville, 1816
- Scytosiphonales
- Sebastes mentella Travin, 1951
- Securiflustra Silén, 1941
- Securiflustra securifrons (Pallas, 1766)
- Sedentaria
- Seirospora Harv.
- Semisalsa Radoman, 1974
- Sepietta neglecta Naef, 1916
- Serpula Linnaeus, 1767
- Serpula vermicularis Linnaeus, 1767
- Sertularella ellisii (Deshayes & Milne-Edwards, 1836)
- Sertularella gayi (Lamouroux, 1821)
- Sertularella polyzonias (Linnaeus, 1758)
- Sertularella rugosa (Linnaeus, 1758)
- Sertularella tenella (Alder, 1856)
- Sertularia argentea Linnaeus, 1758
- Sertularia cupressina Linnaeus, 1758
- Sertularia distans (Lamouroux, 1816)
- Sigalion Audouin & Milne Edwards in Cuvier, 1830
- Sigalion mathildae (Audouin et Milne-Edwards in Cuvier, 1830)
- Sigalion squamosus Delle Chiaje, 1830
- Sigmurethra
- Simnia Risso, 1826
- Simnia patula (Pennant , 1777)
- Siphonoecetes striatus Myers & McGrath, 1979
- Sipuncula
- Sipunculidae
- Sipunculus Linnaeus, 1766
- Sipunculus nudus Linnaeus, 1766
- Siriella Dana, 1850
- Sirogonium Kütz.
- Smirnovipinidae
- Smittoidea Osburn, 1952
- Solenoidea
- Solmaris cf. corona (Keferstein & Ehlers, 1861)
- Somniosus Lesueur, 1818
- Spadella Langerhans, 1880
- Spadellidae
- Spatangidae
- Spatangus Gray, 1825
- Spatangus purpureus Müller, 1776
- Spermothamnion Aresch.
- Sphacelaria fusca (Hudson) S.F.Gray
- Sphacelorbus Draisma, Prud'homme & H.Kawai
- Sphacelorbus nanus (Nageli ex Kützing) Draisma, Prud'homme & H.Kawai
- Sphaerioidea
- Sphaerobotrys Butcher
- Sphaerococcus Stackh.
- Sphaerodoridae
- Sphaerodoridium Lützen, 1961
- Sphaerodoridium minutum (Webster & Benedict, 1887)
- Sphaerodorum Örsted, 1843
- Sphaerosyllis Claparède, 1863
- Sphaerosyllis hystrix Claparède, 1863
- Sphaerosyllis taylori Perkins, 1981
- Sphyriidae
- Spio Fabricius, 1785
- Spio armata (Thulin, 1957)
- Spio decorata Bobretzky, 1870
- Spio filicornis (Müller, 1776)
- Spio goniocephala Thulin, 1957
- Spio martinensis Mesnil, 1896
- Spio symphyta Meißner, Bick & Bastrop, 2011
- Spiophanes Grube, 1860
- Spiophanes bombyx (Claparède, 1870)
- Spiophanes kroyeri Grube, 1860
- Spiralinella Chaster, 1901
- Spiralinella spiralis (Montagu, 1803)
- Spirillina Ehrenb.
- Spirillina vivipara Ehrenb.
- Spirillinida
- Spirillinidae
- Spirobranchus Blainville, 1818
- Spirobranchus lamarcki (Quatrefages, 1866)
- Spirogyra Link
- Spirontocaris Bate, 1888
- Spirorbis Daudin, 1800
- Spirorbis spirorbis (Linnaeus, 1758)
- Spirorbis tridentatus Levinsen, 1883
- Spongomorpha Kütz.
- Sprattus Girgensohn, 1846
- Spyridia Harv.
- Squalus Linnaeus, 1758
- Squatina Duméril, 1805
- Squillidae
- Stauridiosarsia Mayer, 1910
- Stenopleustes Sars, 1895
- Stenopleustes latipes (Sars, 1858)
- Stenosemus albus (Linnaeus, 1767)
- Stenosemus von Middendorf, 1847
- Stenula Barnard, 1962
- Stenurus Dujardin, 1845
- Stenurus globicephalae Baylis & Daubney, 1925
- Stenurus minor (Kühn, 1829)
- Stereobalanus Spengel, 1901
- Stereobalanus canadensis Spengel, 1893
- Steromphala Gray, 1847
- Steromphala umbilicalis (Da Costa, 1778)
- Sthenelais Kinberg, 1856
- Sthenelais boa (Johnston, 1833)
- Sthenelais limicola (Ehlers, 1864)
- Stichococcus Nägeli
- Stigeoclonium Kütz.
- Stigmatoechos Marsson, 1887
- Stigmatoechos violacea (Sars, 1863)
- Stomphia (Gosse, 1859)
- Stomphia coccinea (Müller, 1776)
- Streptodonta San Martín & Hutchings, 2006
- Streptodonta pterochaeta Southern, 1914
- Streptosyllis Webster & Benedict, 1884
- Streptosyllis websteri Southern, 1914
- Stromboidea
- Strongylacron Gee & Huys, 1996
- Styela calva Monniot, Monniot & Millar, 1976
- Stylochoplana Stimpson, 1857
- Stylochoplana maculata (Quatrefages, 1845)
- Stylochoplanidae
- Stylococcaceae
- Stylommatophora
- Stylonema Reinsch
- Stypocaulaceae
- Subadyte Pettibone, 1969
- Subadyte pellucida (Ehlers, 1864)
- Suberites domuncula (Olivi, 1792)
- Suberites ficus (Johnston, 1842)
- Suberites pagurorum Solé-Cava & Thorpe, 1986
- Suberites suberia (Montagu, 1814)
- Suberites virgultosus (Johnston, 1842)
- Succineoidea
- Sycon ciliatum (Fabricius, 1780)
- Syllidia Quatrefages, 1865
- Syllis Savigny in Lamarck, 1818
- Syllis armillaris (Müller, 1776)
- Syllis cornuta Rathke, 1843
- Syllis hyalina Grube, 1863
- Syllis prolifera Krohn, 1852
- Syllis vittata Grube, 1840
- Symphodus Rafinesque, 1810
- Synaptidae
- Synchelidium maculatum Stebbing, 1906
- Syncoryne R.Nielsen & P.M.Pedersen
- Synoicum Phipps, 1774
- Synoicum pulmonaria (Ellis & Solander, 1786)
- Synthesium Stunkard & Alvey, 1930
- Synthesium tursionis (Marchi, 1873)
- Talochlamys Iredale, 1929
- Tamarisca tamarisca (Linnaeus, 1758)
- Tanais Latreille, 1831
- Tanaissus Norman & Scott, 1906
- Tanaopsidae
- Tanaopsis Sars, 1899
- Tanaopsis graciloides (Lilljeborg, 1864)
- Tegastidae
- Tegella Levinsen, 1909
- Tegella unicornis (Fleming, 1828)
- Tellamia Batters
- Tellimya
- Tellinoidea
- Tenellia Costa, 1866
- Tenellia viridis (Forbes, 1840)
- Terebellides Sars, 1835
- Terebellides stroemii Sars, 1835
- Tergipes Cuvier, 1805
- Tetrameridae
- Tetraspora Link ex Desv.
- Tetronarce Gill, 1862
- Thalamophyllia Duchassaing, 1870
- Thalamophyllia gasti (Döderlein, 1913)
- Thalassiosira hendeyi Hasle & G.Fryxell
- Thalassiosira nordenskioeldii Cleve
- Thalassodrilus Brinkhurst, 1963
- Thalassodrilus klarae (Erséus, 1987)
- Thalestridae
- Tharyx Webster & Benedict, 1887
- Tharyx killariensis (Southern, 1914)
- Thelepus Leuckart, 1849
- Thelepus cincinnatus (Fabricius, 1780)
- Theora Adams & Adams, 1856
- Theora lubrica Gould, 1861
- Therochaeta Chamberlin, 1919
- Therochaeta flabellata (Sars in Sars, 1872)
- Thia Leach, 1816
- Thoracica
- Thoracophelia Ehlers, 1897
- Thoracophelia flabellifera Ziegelmeier, 1955
- Thorea Bory
- Thorogobius Miller, 1969
- Thorogobius ephippiatus (Lowe, 1839)
- Thracia convexa (Wood, 1815)
- Thracia pubescens (Pulteney, 1799)
- Thracia villosiuscula (MacGillivray, 1827)
- Thracioidea
- Thuiaria articulata (Pallas, 1766)
- Thuiaria thuja (Linnaeus, 1758)
- Thyasira flexuosa (Montagu, 1803)
- Thyasiroidea
- Thyone Oken, 1815
- Thyone fusus (Müller, 1776)
- Thysanocardia (Fisher, 1950)
- Thysanocardia procera (Möbius, 1875)
- Thysanote Krøyer, 1863
- Tiaropsis multicirrata (Sars, 1835)
- Tilopteridales
- Tima bairdi (Johnston, 1833)
- Tisbidae
- Titanoderma Nägeli
- Tmetonyx Stebbing, 1906
- Tmetonyx similis (Sars, 1891)
- Todarodes Steenstrup, 1880
- Torpediniformes
- Torpedo Duméril, 1806
- Torynurus Baylis & Daubney, 1925
- Torynurus convolutus (Kühn, 1829)
- Trachylinae
- Trailliella C.Agardh
- Travisia Johnston, 1840
- Travisia forbesii Johnston, 1840
- Trebiidae
- Trentepohlia Mart.
- Treptacantha Kützing
- Tricellaria Fleming, 1828
- Tricellaria inopinata d'Hondt & Occhipinti Ambrogi, 1985
- Tricellaria ternata (Ellis & Solander, 1786)
- Trichobranchidae
- Trichobranchus Malmgren, 1866
- Trichobranchus roseus (Malm, 1874)
- Tridentiger Gill, 1859
- Tridentiger barbatus (Günther, 1861)
- Tridentiger bifasciatus Steindachner, 1881
- Trigonocotyle Baer, 1932
- Trigonocotyle spasskyi Gubanov in Delyamure, 1955
- Trinchesia Ihering, 1879
- Trinchesia cf. pupillae (Baba, 1961)
- Trinchesia foliata (Forbes & Goodsir, 1839)
- Trinchesiidae
- Trinectes Rafinesque, 1832
- Trinectes maculatus (Bloch & Schneider, 1801)
- Triphoroidea
- Trissexodontidae
- Tritia Risso, 1826
- Triticella flava Dalyell, 1848
- Triticella pedicellata (Alder, 1857)
- Tritonioidea
- Trochida
- Trochoidea
- Truncatelloidea
- Trypetesa Norman, 1903
- Trypetesa lampas (Hancock, 1849)
- Tryphosa Boeck, 1871
- Tryphosa nana (Krøyer, 1846)
- Tryphosella horingi (Boeck, 1871)
- Tryphosites G.O. Sars, 1895
- Tryphosites longipes (Bate & Westwood, 1861)
- Tubificoides benedii (Udekem, 1855)
- Tubificoides brownae Brinkhurst & Baker, 1979
- Tubificoides diazi Brinkhurst & Baker, 1979
- Tubificoides insularis (Stephenson, 1922)
- Tubificoides parapectinatus Brinkhurst, 1985
- Tubothalamea
- Tubulanidae
- Tubulaniformes Chernyshev, 1995
- Tubulanus Renier, 1804
- Tubulanus polymorphus Renier, 1804
- Tubulanus superbus (Kölliker, 1845)
- Tubularia indivisa Linnaeus, 1758
- Tubulipora Lamarck, 1816
- Tubulipora liliacea (Pallas, 1766)
- Turbanella Schultze, 1853
- Turbanella ambronensis Remane, 1943
- Turbanella cornuta Remane, 1925
- Turbanella hyalina Schultze, 1853
- Turbanella mustela Wieser, 1957
- Turbanellidae
- Turbicellepora Ryland, 1963
- Turbicellepora avicularis (Hincks, 1860)
- Turritella Lamarck, 1799
- Turritella communis Risso, 1826
- Turritellidae
- Turritopsis polycirrha (Keferstein, 1862)
- Ulothrix Kütz.
- Ulva L.
- Ulva australis Aresch.
- Ulva compressa L.
- Ulva laetevirens J.E. Areschoug
- Ulva linza L.
- Ulva pseudorotundata M.Cormaci, G.Furnari & G.Alongi
- Ulva rigida var. fimbriata J.Agardh
- Ulvella P.Crouan & H.Crouan
- Umbra Kramer, 1777
- Unciola Say, 1818
- Unciola crenatipalma (Bate, 1862)
- Unciola planipes Norman, 1867
- Unciolidae
- Ungulinidae
- Ungulinoidea
- Unionida
- Unionoidea
- Upogebia Leach, 1814
- Upogebia deltaura (Leach, 1815)
- Upogebia stellata (Montagu, 1808)
- Uristidae
- Uromunna Menzies, 1962
- Uronema Lagerh.
- Urothoe elegans (Bate, 1857)
- Urothoe marina (Bate, 1857)
- Urothoe pulchella (Costa, 1853)
- Urticina Ehrenberg, 1834
- Urticina eques (Gosse, 1858)
- Urticina felina (Linnaeus, 1761)
- Valvatida
- Valvatoidea
- Vanikoroidea
- Vaucheria longicaulis Hoppaugh
- Vaunthompsonia Bate, 1858
- Vaunthompsonia cristata Bate, 1858
- Velella velella (Linnaeus, 1758)
- Velutina Fleming, 1820
- Velutina velutina (Müller, 1776)
- Velutinidae
- Velutinoidea
- Venerida
- Veneroidea
- Vermiliopsis Saint-Joseph, 1894
- Vertebrata S.F.Gray
- Vertebrata nigra (Hudson) Díaz-Tapia & Maggs
- Vesicularia spinosa (Linnaeus, 1758)
- Vetigastropoda
- Victorella Saville-Kent, 1870
- Victorella pavida Saville-Kent, 1870
- Vitreolina Monterosato, 1884
- Vitreolina philippi (de Rayneval & Ponzi, 1854)
- Walkeria Fleming, 1823
- Walkeria uva (Linnaeus, 1758)
- Watersipora Neviani, 1896
- Watersipora subatra (Ortmann, 1890)
- Westwoodilla Bate, 1862
- Westwoodilla caecula (Bate, 1857)
- Wittrockiella Wille
- Xerotricha apicina (Lamarck, 1822)
- Xylophagidae
- Yoldia Møller, 1842
- Yoldia limatula (Say, 1831)
- Yoldiella A. E. Verrill & Bush, 1897
- Yoldiella philippiana (Nyst, 1845)
- Yoldiidae
- Zeuxo Templeton, 1840
- Zeuxo holdichi Bamber, 1990
- Zygnema C.Agardh
- [unassigned] Caenogastropoda
- [unassigned] Heterobranchia
- [unassigned] Stylommatophora