Ocnus brunnea Forbes, 18?67 – synonym of Ocnus lacteus
Ocnus brunneus, Forbes & Goodsir, in Forbes, 1841 – synonym of Ocnus planci
Ophiocantha danae Mortensen, 1933 – synonym of Ophiocomina nigra
Ophiocentrus brachiatus Montagu, 18?? – synonym of Amphiura brachiata
Ophiocoma balli W. Thompson, 1840 – synonym of Ophiactis balli
Ophiocoma bellis Forbes, 1839 – synonym of Ophiopholis aculeata
Ophiocoma Goodsiri Forbes, 1840 – synonym of Ophiactis balli
Ophiocoma granulata Forbes, 1839 – synonym of Ophiocomina nigra
Ophiocoma minuta Forbes, 1839 – synonym of Ophiothrix fragilis
Ophiocoma nigra Abildgaard, in O.F. Müller, 1789 – synonym of Ophiocomina nigra
Ophiocoma nilssoni J. Müller & Troschel, 1842 – synonym of Ophiocomina nigra
Ophiocoma raschi G.O. Sars, 18?? – synonym of Ophiocomina nigra
Ophiocoma rosula Forbes, 1839 – synonym of Ophiothrix fragilis
Ophiocten affinis Lütken, 1859 – synonym of Ophiura affinis
Ophiolepis robusta Ayres, 1851 – synonym of Ophiura robusta
Ophiolepis scolopendrica J. Müller & Troschel, 1842 – synonym of Ophiopholis aculeata
Ophiopeltis securigera Düben & Koren, 1844 – synonym of Amphiura securigera
Ophiopholis bellis Lyman, 1882 – synonym of Ophiopholis aculeata
Ophiothrix alopecurus J. Müller & Troschel, 1842 – synonym of Ophiothrix fragilis
Ophiothrix ferussacii J. Müller & Troschel, 1842 – synonym of Ophiothrix fragilis
Ophiothrix lusitanica Ljungman, 1872 – synonym of Ophiothrix fragilis
Ophiothrix rammelsbergii J. Müller & Troschel, 1842 – synonym of Ophiothrix fragilis
Ophiothrix rubra Ljungman, 1872 – synonym of Ophiothrix fragilis
Ophiura affinis Lütken, 1858 – synonym of Ophiura affinis
Ophiura ciliaris (Linnaeus, 1766) – synonym of Ophiura ophiura
Ophiura ciliata (Retzius, 1783) non (O.F. Müller, 1776) – synonym of Ophiura ophiura
Ophiura fasciculata Forbes, 1854 – synonym of Ophiura robusta
Ophiura lacertosa Pennant, 1777 – synonym of Ophiura ophiura
Ophiura normani Hodge, 1872 – synonym of Ophiura affinis
Ophiura squamosa Lütken, 1859 – synonym of Ophiura robusta
Ophiura texturata de Lamarck, 1816 – synonym of Ophiura ophiura