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Agnathans: Hagfishes and Lampreys, Conodonts and OstracodermsA. Lackinginto their mouths.B. Hagfishes and lampreys are the...

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Agnathans: Hagfishes and Lampreys, Conodonts and OstracodermsA. Lackinginto their mouths.B. Hagfishes and lampreys are the living descendants of ancient agnathan lineages.1. Two lineages of jawless vertebrates, hagfishes (Myxinoidea) and lampreys(Petromyzontoidea), still live today. Both have skeletons composed entirely of cartilage.They have a well-developed notochord, but no true vertebrae or paired fins2. The axial skeleton of the 60 living species of hagfishes includes only a cranium and anotochord. Hagfishes are marine scavengers that burrow in sediments on continentalshelves. Hagfish life cycles are simple and lack a larval stage.3. The 40 or so living species of lampreys have a more derived axial skeleton. Theirnotochord is surrounded by dorsally pointing cartilages that partially cover the nervecord. Most are parasitic as adults. Sexually mature adults migrate to the headwaters of astream, where they reproduce and then die. Their suspension-feeding larvae resembleadult cephalochordates.most of the earliest vertebrates used a pharynx to suck food

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