Which of the following organisms belongs to the Class Agnatha and is known for its parasitic lifestyle, attaching to fish with a suctorial mouth?
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Correct answer: Lamprey (Petromyzon)
Lampreys (Petromyzon) are jawless vertebrates (Class Agnatha) with a circular, funnel-like oral disc lined with horny teeth. As ectoparasites, they attach to host fish and use this rasping structure to penetrate the skin and feed on blood and body fluids.
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