• Acaulis primarius Stimpson, 1853
• Acauloides ammisatum Bouillon, 1965
• Acauloides ilonae (Brinckmann-Voss, 1966)
• Actigia vanbenedeni (Hincks, 1869) accepted as Coryne vanbenedenii Hincks, 1868
• Amalthaea sarsii (Steenstup, 1854) accepted as Corymorpha sarsii Steenstrup, 1855
• Amphinema biscayana (Browne, 1907)
• Amphinema dinema (Péron & Lesueur, 1810)
• Amphinema krampi Russell, 1956
• Amphinema rubrum (Kramp, 1957)
• Amphinema rugosum (Mayer, 1900)
• Amphinema turrida (Mayer, 1900)
• Annatiara affinis (Hartlaub, 1914)
• Aselomaris arenosa (Alder, 1862) accepted as Rhizorhagium arenosum (Alder, 1862)
• Aselomaris michaeli Berrill, 1948 accepted as Pachycordyle michaeli (Berrill, 1948)
• Bimeria vestita Wright, 1859
• Boreohydra simplex Westblad, 1937 accepted as Plotocnide borealis Wagner, 1885
• Bougainvillia britannica (Forbes, 1841)
• Bougainvillia charcoti Le Danois, 1913 accepted as Nemopsis bachei L. Agassiz, 1849
• Bougainvillia flavida Hartlaub, 1897 accepted as Bougainvillia britannica (Forbes, 1841)
• Bougainvillia macloviana Lesson, 1830
• Bougainvillia multicilia (Haeckel, 1879) (uncertain > taxon inquirendum)
• Bougainvillia muscoides (Sars, 1846)
• Bougainvillia muscus (Allman, 1863)
• Bougainvillia principis (Steenstrup, 1850)
• Bougainvillia pyramidata (Forbes & Goodsir, 1853)
• Bougainvillia ramosa (Van Beneden, 1844) accepted as Bougainvillia muscus (Allman, 1863)
• Bougainvillia rugosa Clarke, 1882
• Bougainvillia superciliaris (L. Agassiz, 1849)
• Bouillonactinia hooperii (Sigerfoos, 1899)
• Bouillonia cornucopia (Bonnevie, 1898)
• Branchiocerianthus italicus Stechow, 1921
• Branchiocerianthus norvegicus Brattström, 1956
• Bythotiara murrayi Günther, 1903
• Calycopsis gara Petersen, 1957
• Calycopsis krampi Petersen, 1957
• Calycopsis simplex Kramp & Damas, 1925
• Calyptospadix cerulea Clarke, 1882
• Candelabrum cocksi (Cocks, 1854) accepted as Candelabrum cocksii (Cocks, 1854)
• Candelabrum cocksii (Cocks, 1854)
• Candelabrum minutum (Bonnevie, 1898) accepted as Candelabrum phrygium (Fabricius, 1780)
• Candelabrum mitra (Bonnevie, 1898) accepted as Candelabrum phrygium (Fabricius, 1780)
• Candelabrum phrygium (Fabricius, 1780)
• Candelabrum serpentarii Segonzac & Vervoort, 1995
• Candelabrum verrucosum (Bonnevie, 1898) accepted as Candelabrum phrygium (Fabricius, 1780)
• Catablema vesicarium (A. Agassiz, 1862)
• Cladocoryne floccosa Rotch, 1871
• Cladonema radiatum Dujardin, 1843
• Clava cornea Wright, 1857 accepted as Clava multicornis (Forsskål, 1775)
• Clava diffusa Allman, 1863 accepted as Clava multicornis (Forsskål, 1775)
• Clava leptostyla L. Agassiz, 1862 accepted as Clava multicornis (Forsskål, 1775)
• Clava multicornis (Forsskål, 1775)
• Clava squamata (Müller, 1776) accepted as Clava multicornis (Forsskål, 1775)
• Clavactinia serrata (Kramp, 1943)
• Clavopsella michaeli (Berrill, 1948) accepted as Pachycordyle michaeli (Berrill, 1948)
• Clavopsella navis (Millard, 1959) accepted as Pachycordyle michaeli (Berrill, 1948)
• Codonium proliferum (Forbes, 1848)
• Codonorchis octaedrus Haeckel, 1879 (uncertain > nomen dubium)
• Cordylophora caspia (Pallas, 1771)
• Cordylophora inkermanica Marfenin, 1983 accepted as Pachycordyle michaeli (Berrill, 1948)
• Cordylophora pusilla Motz-Kossowska, 1905 accepted as Pachycordyle pusilla (Motz-Kossowska, 1905)
• Corydendrium dispar Kramp, 1935
• Corydendrium nutricula (McCrady, 1857) accepted as Turritopsis nutricula McCrady, 1857
• Corydendrium parasiticum (Linnaeus, 1767)
• Corymorpha abyssalis Broch, 1910 accepted as Corymorpha groenlandica (Allman, 1876)
• Corymorpha annulata (Kramp, 1928)
• Corymorpha annulicornis M. Sars, 1859 accepted as Euphysa aurata Forbes, 1848
• Corymorpha appellöfi Bonnevie, 1901 accepted as Corymorpha nutans M. Sars, 1835
• Corymorpha bigelowi (Maas, 1905)
• Corymorpha forbesii (Mayer, 1894)
• Corymorpha glacialis M. Sars, 1860
• Corymorpha groenlandica (Allman, 1876)
• Corymorpha nana Alder, 1857
• Corymorpha nutans M. Sars, 1835
• Corymorpha petalina (Margulis, 1989) accepted as Rhabdoon singulare Keferstein & Ehlers, 1861
• Corymorpha sarsii Steenstrup, 1855
• Coryne brevicornis Bonnevie, 1898 (uncertain > taxon inquirendum)
• Coryne caespes Allman, 1871 (uncertain > taxon inquirendum)
• Coryne clavata (Keferstein, 1862) accepted as Sarsia clavata Keferstein, 1862 accepted as Stauridiosarsia gemmifera (Forbes, 1848)
• Coryne epizoica Stechow, 1921
• Coryne eximia Allman, 1859
• Coryne filiformis (Rees, 1936) accepted as Coryne pintneri Schneider, 1897
• Coryne fucicola (de Filipi, 1866)
• Coryne graeffei Jickeli, 1883 (uncertain > taxon inquirendum)
• Coryne hincksi Bonnevie, 1898
• Coryne muscoides (Linnaeus, 1761)
• Coryne pintneri Schneider, 1897
• Coryne producta (Wright, 1858) accepted as Stauridiosarsia producta (Wright, 1858)
• Coryne prolifera (Forbes, 1848) accepted as Codonium proliferum (Forbes, 1848)
• Coryne pusilla Gaertner, 1774
• Coryne vanbenedenii Hincks, 1868 (uncertain > taxon inquirendum)
• Crypthelia affinis Moseley, 1879
• Crypthelia medioatlantica Zibrowius & Cairns, 1992
• Crypthelia tenuiseptata Cairns, 1986
• Crypthelia vascomarquesi Zibrowius & Cairns, 1992
• Cytaeis propagulata (Bavestrello, 1987) accepted as Perarella propagulata Bavestrello, 1987
• Cytaeis pusilla Gegenbaur, 1857 (uncertain > taxon inquirendum)
• Cytaeis schneideri (Motz-Kossowska, 1905) accepted as Perarella schneideri (Motz-Kossowska, 1905)
• Cytaeis tetrastyla Eschscholtz, 1829
• Dicodonium adriaticum Graeffe, 1884 (uncertain > taxon inquirendum)
• Dicodonium ocellatum (Busch, 1851) accepted as Sarsia ocellata Busch, 1851