Cyclostomata, a group of jawless vertebrates, comprises hagfishes and lampreys, exhibiting unique characteristics such as cylindrical body, lack of pair fins, smooth skin, and presence of mucous glands. They possess specific features like circular mouth with teeth, lateral line sense organ, and two-

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Lymphoid organs play a crucial role in the defense mechanisms of finfish and shellfish by generating immune cells. Different types of fish vary in their lymphoid organ structures, with jawless fish relying on lymphoid tissue within other organs for immune cell production. Cyclostomes, like hagfish a

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