1. Species Ophidium aculeatum Bloch, 1786 accepted as Macrognathus aculeatus (Bloch, 1786) (homonym)
2. Species Ophidium atropurpureum Kittlitz, 1858 accepted as Xiphister atropurpureus (Kittlitz, 1858)
3. Species Ophidium barbatum Linnaeus, 1758 accepted as Ophidion barbatum Linnaeus, 1758 (misspelling)
4. Species Ophidium beani Jordan & Gilbert, 1883 accepted as Ophidion holbrookii Putnam, 1874 (synonym)
5. Species Ophidium blacodes Forster, 1801 accepted as Genypterus blacodes (Forster, 1801)
6. Species Ophidium brasiliense Kaup, 1856 accepted as Raneya brasiliensis (Kaup, 1856)
7. Species Ophidium brevibarbe Cuvier, 1829 accepted as Lepophidium brevibarbe (Cuvier, 1829)
8. Species Ophidium dentatum Cuvier, 1829 accepted as Echiodon dentatus (Cuvier, 1829)
9. Species Ophidium fierasfer Risso, 1827 accepted as Carapus acus (Brünnich, 1768)
10. Species Ophidium fulvescens Rafinesque, 1810 accepted as Pholis gunnellus (Linnaeus, 1758)
11. Species Ophidium giganteum Kittlitz, 1858 accepted as Cryptacanthodes giganteus (Kittlitz, 1858)
12. Species Ophidium giganteus Kittlitz, 1858 accepted as Cryptacanthodes giganteus (Kittlitz, 1858) (misspelling)
13. Species Ophidium graellsi Poey, 1861 accepted as Lepophidium brevibarbe (Cuvier, 1829)
14. Species Ophidium graëllsi Poey, 1861 accepted as Lepophidium brevibarbe (Cuvier, 1829) (unaccepted > misspelling)
15. Species Ophidium holbrookii Putnam, 1874 accepted as Ophidion holbrookii Putnam, 1874 (misspelling)
16. Species Ophidium imberbe Cuvier, 1815 accepted as Carapus acus (Brünnich, 1768)
17. Species Ophidium maculatum Tschudi, 1846 accepted as Genypterus maculatus (Tschudi, 1846)
18. Species Ophidium maculatum Rafinesque, 1810 accepted as Ophidion barbatum Linnaeus, 1758
19. Species Ophidium marginatum DeKay, 1842 accepted as Ophidion marginatum DeKay, 1842 (misspelling)
20. Species Ophidium mucronatum Mitchill, 1815 accepted as Pholis gunnellus (Linnaeus, 1758)
21. Species Ophidium muraenolepis Günther, 1880 accepted as Ophidion muraenolepis Günther, 1880 (misspelling)
22. Species Ophidium ocellatum Tilesius, 1811 accepted as Opisthocentrus ocellatus (Tilesius, 1811)
23. Species Ophidium pellucidum Couch, 1832 accepted as Conger conger (Linnaeus, 1758) (synonym)
24. Species Ophidium stigma Lay & Bennett, 1839 accepted as Gymnelus viridis (Fabricius, 1780)
25. Species Ophidium unernak Lacepède, 1800 accepted as Gymnelus viridis (Fabricius, 1780)
26. Species Ophidium vassali Risso, 1810 accepted as Parophidion vassali (Risso, 1810)
27. Species Ophidium viride Fabricius, 1780 accepted as Gymnelus viridis (Fabricius, 1780)

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