Which lineage includes living members that are jawless vertebrates called lampreys, which are mostly parasitic as adults?

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Petromyzontidae is the family that includes lampreys, which are jawless vertebrates. Unlike Urochordata and Cephalochordata, which are invertebrates, and Placodermi, which are an extinct class of armored prehistoric fish, Petromyzontidae comprises living jawless vertebrates, some of which are parasitic as adults.

Which Lineage Includes Living Members That Are Jawless Vertebrates Called