• Abyssura brevibrachia Belyaev & Litvinova, 1976
• Acrocnida brachiata (Montagu, 1804)
• Acrocnida brachiata suecica Gislén, 1926 accepted as Acrocnida brachiata (Montagu, 1804)
• Acrocnida fuscoalba (Brock, 1888)
• Acrocnida neapolitana (M. Sars, 1857) accepted as Acrocnida brachiata (Montagu, 1804)
• Acrocnida semisquamata (Koehler, 1914)
• Acrocnida spatulispina Stöhr & Muths, 2010
• Actinozonella texturata (Lyman, 1883)
• Alternacantha arges Thuy, 2013 †
• Alternacantha dilionessa Thuy, 2013 †
• Alternacantha occulta Thuy & Meyer, 2012 †
• Alternacantha schwermannorum Thuy, 2013 †
• Amphiacantha acanthina (H.L. Clark, 1911) accepted as Dougaloplus acanthinus (H.L. Clark, 1911)
• Amphiacantha amphacantha (McClendon, 1909) accepted as Dougaloplus amphacanthus (McClendon, 1909)
• Amphiacantha derjugini Djakonov, 1949 accepted as Dougaloplus derjugini (Djakonov, 1949)
• Amphiacantha dividua Matsumoto, 1917 accepted as Ophiocomella sexradia (Duncan, 1887)
• Amphiacantha libera (Koehler, 1907) accepted as Dougaloplus libera (Koehler, 1907)
• Amphiacantha pentacantha (H.L. Clark, 1911) accepted as Dougaloplus amphacanthus (McClendon, 1909)
• Amphiacantha transacta Koehler, 1930 accepted as Dougaloplus transacta (Koehler, 1930) accepted as Amphilimna transacta (Koehler, 1930)
• Amphiactis affinis (Studer, 1885) accepted as Amphioplus affinis (Studer, 1885)
• Amphiactis astarte A.H. Clark, 1949 accepted as Ophiozonella astarte (A. H. Clark, 1949)
• Amphiactis canescens (Lyman, 1879) accepted as Histampica canescens (Lyman, 1879)
• Amphiactis dissidens (Koehler, 1904) accepted as Ophiomedea dissidens (Koehler, 1904) accepted as Histampica dissidens (Koehler, 1904)
• Amphiactis duplicata (Lyman, 1875) accepted as Histampica duplicata (Lyman, 1875)
• Amphiactis lycidas A.H. Clark, 1949 accepted as Ophiactis lycidas (A.H. Clark, 1949) accepted as Histampica lycidas (A.H. Clark, 1949)
• Amphiactis parata (Koehler, 1904) accepted as Ophiocopa spatula Lyman, 1883
• Amphiactis partita (Koehler, 1897) accepted as Histampica duplicata (Lyman, 1875)
• Amphiactis patula (Lyman, 1879) accepted as Amphioplus (Unioplus) patulus (Lyman, 1879) accepted as Silax patulus (Lyman, 1879)
• Amphiactis pectorale (Lyman, 1880) accepted as Ophiodictys pectorale (Lyman, 1880)
• Amphiactis picteti (de Loriol, 1893) accepted as Ophiactis picteti (de Loriol, 1893)
• Amphiactis proposita (Koehler, 1922) accepted as Amphiura proposita Koehler, 1922
• Amphiactis umbonata Matsumoto, 1915 accepted as Histampica umbonata (Matsumoto, 1915)
• Amphichilus cesareus (Koehler, 1905) accepted as Amphioplus (Amphichilus) impressus (Ljungman, 1867)
• Amphichilus daleus (Lyman, 1879) accepted as Silax daleus (Lyman, 1879)
• Amphichilus intermedius (Koehler, 1905) accepted as Amphioplus (Amphioplus) intermedius (Koehler, 1905)
• Amphichilus trichoides Matsumoto, 1917 accepted as Amphioplus (Amphichilus) trichoides (Matsumoto, 1917)
• Amphichondrius granulatus (Lütken & Mortensen, 1899)
• Amphichondrius granulosus Nielsen, 1932 accepted as Amphichondrius granulatus (Lütken & Mortensen, 1899)
• Amphichondrius laevis Ziesenhenne, 1940
• Amphichondrius unamexici Caso, 1982 accepted as Amphichondrius granulatus (Lütken & Mortensen, 1899)
• Amphicontus minutus Hill, 1940
• Amphicutis stygobita Pomory, Carpenter & Winter, 2011
• Amphigyptis perplexa Nielsen, 1932 accepted as Amphipholizona perplexa (Nielsen, 1932)
• Amphilepis antarctica Koehler, 1908 accepted as Amphioplus affinis (Studer, 1885)
• Amphilepis diastata Murakami, 1942 accepted as Amphiura diastata (Murakami, 1942) non McClendon, 1909
• Amphilepis guerini Cherbonnier & Guille, 1978
• Amphilepis gymnopora Hertz, 1927 accepted as Amphiura belgicae Koehler, 1900
• Amphilepis ingolfiana Mortensen, 1933
• Amphilepis mobilis Koehler, 1904
• Amphilepis neozelandica Mills & O'Hara, 2010
• Amphilepis norvegica (Ljungman, 1865)
• Amphilepis nuda Tommasi, 1976
• Amphilepis papyracea Lyman, 1879
• Amphilepis patens Lyman, 1879
• Amphilepis platytata H.L. Clark, 1911 accepted as Amphilepis patens Lyman, 1879
• Amphilepis protecta Koehler, 1904 accepted as Ophiomonas protecta (Koehler, 1904)
• Amphilepis pycnostoma (H.L. Clark, 1911)
• Amphilepis remittens Koehler, 1922 accepted as Ophiomonas remittens (Koehler, 1922)
• Amphilepis sanmatiensis Bernasconi & D'Agostino, 1975 accepted as Amphioplus lucyae Tommasi, 1971
• Amphilepis scutata Mortensen, 1933
• Amphilepis tenuis Lyman, 1879
• Amphilepis teodorae Tommasi & Abreu, 1974
• Amphilimna caribea (Ljungman, 1872) accepted as Ophiopsila caribea (Ljungman, 1872)
• Amphilimna cribriformis A.M. Clark, 1974
• Amphilimna granulosa Liao, 1989
• Amphilimna intersepultosetme Thuy, Numberger-Thuy & Jagt, 2018 †
• Amphilimna libera (Koehler, 1907) accepted as Dougaloplus libera (Koehler, 1907)
• Amphilimna mirabilis (H.L. Clark, 1941)
• Amphilimna multispina Koehler, 1922
• Amphilimna nike (Schoener, 1967)
• Amphilimna olivacea (Lyman, 1869)
• Amphilimna pentacantha H.L. Clark, 1911 accepted as Dougaloplus amphacanthus (McClendon, 1909)
• Amphilimna polyacantha Liao, 1983
• Amphilimna sexradia (Duncan, 1887) accepted as Ophiocomella sexradia (Duncan, 1887)
• Amphilimna sinica Liao, 1989
• Amphilimna tanyodes Devaney, 1974
• Amphilimna transacta (Koehler, 1930)
• Amphilimna valida (H.L. Clark, 1939)
• Amphilycus androphorus Mortensen, 1933 accepted as Ophiodaphne scripta (Koehler, 1904)
• Amphilycus scripta (Koehler, 1904) accepted as Ophiodaphne scripta (Koehler, 1904)
• Amphiocnida brachiata (Montagu, 1804) accepted as Acrocnida brachiata (Montagu, 1804)
• Amphiocnida inaequalis H.L. Clark, 1915 accepted as Ophiocentrus inaequalis (H.L. Clark, 1915)
• Amphiocnida inequalis H.L. Clark, 1915 accepted as Ophiocentrus inaequalis (H.L. Clark, 1915)
• Amphiocnida pilosa (Lyman, 1879) accepted as Ophiocentrus pilosa (Lyman, 1879)
• Amphiocnida putnami (Lyman, 1871) accepted as Ophiocentrus putnami (Lyman, 1871)
• Amphiocnida semisquamata Koehler, 1914 accepted as Acrocnida semisquamata (Koehler, 1914)
• Amphiodia (Amphiodia) fissa (Lütken, 1869)
• Amphiodia (Amphiodia) orientalis Liao, 2004
• Amphiodia (Amphiodia) picardi Cherbonnier & Guille, 1978 accepted as Ophionephthys difficilis (Duncan, 1887)
• Amphiodia (Amphispina) clarki Liao, 2004 accepted as Amphiodia (Amphispina) obtecta Mortensen, 1940
• Amphiodia (Amphispina) digitata Nielsen, 1932
• Amphiodia (Amphispina) duplicata (Koehler, 1930)
• Amphiodia (Amphispina) loripes (Koehler, 1922)
• Amphiodia (Amphispina) microplax Burfield, 1924
• Amphiodia (Amphispina) obtecta Mortensen, 1940
• Amphiodia (Amphispina) urtica (Lyman, 1860)
• Amphiodia acutispina Koehler, 1914 accepted as Ophiophragmus acutispina (Koehler, 1914)
• Amphiodia affinis (Studer, 1885) accepted as Amphioplus affinis (Studer, 1885)
• Amphiodia akosmos Hendler & Bundrick, 2001
• Amphiodia ancistrota H.L. Clark, 1911 accepted as Amphioplus (Amphioplus) ancistrotus Clark, 1911