Question

Lamprey (Petromyzon) is included in

• A. Gnathostomata.
• B. Cyclostomata.
• C. Chondrichthyes.
• D. Osteichthyes.

Answer 1

The correct option is B Cyclostomata.

Lampreys are one of the jawless fishes of the order Petromyzontiformes. Petromyzon is the scientific name of the sea lamprey. Chordates are characterized by the presence of notochord. Cyclostomata is a type of Chordate, that comprises the living jawless fishes, like the lampreys and hagfishes. It is long and slender snake-like organism. This organism is not called as the true fish. The organism lacks the paired fins. The organism has well developed dorsal and ventral fin folds. These fin folds help in swimming and locomotion. The adult stage is characterized by a toothed, funnel-like sucking mouth.

Thus, the correct answer is option B.