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Myxini
Class, Jawless fish (Agnatha), Marine
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Petromyzon marinus – Sea Lamprey
Species, Jawless fish (Agnatha), Freshwater, marine, terrestrial
creathaill na mara, creathall na mara, Llysywen Bendoll y Môr, Llysywod Pendoll y Môr
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Myxine
Genus, Jawless fish (Agnatha), Marine
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Myxine ios
Species, Jawless fish (Agnatha), Marine
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Myxininae
Subfamily, Jawless fish (Agnatha), Marine
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Lampetrinae
Subfamily, Jawless fish (Agnatha), Marine
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Lampetra fluviatilis – River Lamprey
Species, Jawless fish (Agnatha), Freshwater, marine, terrestrial
Lampern, Llysywen Bendoll yr Afon, Llysywod Pendoll yr Afon