Discussion
Lamprey, a jawless fish, belongs to which one of the following 'Classes'?
Answer: B
Lampreys belong to the class Cephalaspilomorphi (usually spelt Cephalaspidomorphi).
In the traditional classification of jawless fishes (Agnatha), lampreys are placed in Cephalaspidomorphi (also called Petromyzontida or Hyperoartia), together with fossil cephalaspids, because they share a single median nostril and a dorsal nasohypophyseal opening.
Myxini is the class of hagfishes, the other living jawless fishes. Conodonta are extinct eel-like animals known mainly from their tooth-like elements, and Anaspida are extinct armoured jawless fishes.
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