NEET 2026 Biology question
A group of researchers procured some fish like animals and upon investigation the following characters were observed: A. Endoskeleton was made of cartilage. B. Ectoparasitic; as they were found attached on fish skin with their circular sucking mouth. C. 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?
Solution
*Petromyzon* (lamprey), a cyclostome, has a cartilaginous endoskeleton, a circular sucking and rasping mouth without jaws, is ectoparasitic on fishes, and lacks scales and paired fins; it has 6-15 pairs of gills slits (7 in the question).
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