Question

why agnatha group is called jaw less fishes

Answer 1

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The group Agnatha consists of the jawless fishes, the most primitive group of extant vertebrates. While most agnathan species are now extinct, fossil ... many features with the cephalochordate Branchiostoma (formerly called Amphioxus), which is the group believed to be most closely related to the vertebrates.
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Answer 2

in the process of evolution first agnatha group was evolved so it's due to evolution by which agnatha group doesn't have jaws

later evoluted fishes with jaws..