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Eptatretus is a large genus of hagfish.

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Eudontomyzon is a genus of lamprey in the family Petromyzontidae. Most species are found in Eastern Europe.

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Ichthyomyzon is a genus of northern lampreys in the sub-family Petromyzontinae, native to North America.

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Lampetra is a genus of lampreys in the subfamily Petromyzontinae.

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Lethenteron is a genus of lamprey in the family Petromyzontidae.

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Mordacia is the sole genus of the family Mordaciidae, also known as the southern topeyed lampreys.

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Myxine is a genus of hagfish.