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Nemacheilidae
Family, Bony fish (Actinopterygii), Marine
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Nemichthyidae – Snipe-eels
Family, Bony fish (Actinopterygii), Marine
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Nettastomatidae – Duckbill eels
Family, Bony fish (Actinopterygii), Marine
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Nomeidae – Driftfishes
Family, Bony fish (Actinopterygii), Marine
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Notacanthidae – Spiny eels
Family, Bony fish (Actinopterygii), Marine
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Notosudidae – Waryfishes
Family, Bony fish (Actinopterygii), Marine
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Omosudidae
Family, Bony fish (Actinopterygii), Marine
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Oneirodidae
Family, Bony fish (Actinopterygii), Marine
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Ophidiidae – Cusk eels
Family, Bony fish (Actinopterygii), Marine, terrestrial
Cuskeels
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Opisthoproctidae – Barreleyes or spookfishes
Family, Bony fish (Actinopterygii), Marine
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Oreosomatidae – Oreos
Family, Bony fish (Actinopterygii), Marine
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Osmeridae
Family, Bony fish (Actinopterygii), Marine, terrestrial
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Oxynotidae
Family, Cartilagenous fish (Chondrichthyes), Marine
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Parabrotulidae – False brotulas
Family, Bony fish (Actinopterygii), Marine
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Paralepididae – Barracudinas
Family, Bony fish (Actinopterygii), Marine
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Percichthyidae
Family, Bony fish (Actinopterygii), Marine
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Percidae
Family, Bony fish (Actinopterygii), Marine, terrestrial
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Peristediidae
Family, Bony fish (Actinopterygii), Marine
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Petromyzontidae
Family, Jawless fish (Agnatha), Marine, terrestrial
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Pholidae
Family, Bony fish (Actinopterygii), Marine