Cyclostomata (jawless fish) characteristics

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  1. A group of researchers procured some fish-like animals and upon investigation the following characters were observed: I. Endoskeleton was made of cartilage. II. Ectoparasitic; as they were found attached on fish skin with their circular sucking mouth. III. Paired fins and scales were absent, but 7 pairs of gill slits were present. Which of the following species of animals did they consider to fit best with these characters?