| (i) All living members of this class are ectoparasites on some fishes, |
| (ii) They have a sucking and circular mouth without jaws. |
| (iii) Circulation is of closed type. |
| (iv) They are marine but migrate for spawning to fresh water. After spawing, within a few days they die. |
A) Cyclostomata
B) Chondrichthyes
C) Osteichthyes
D) Amphibia
Correct Answer: A
Solution :
[a] Cyclostomata is a group of chordates that includes the living jawless fishes: the lampreys and hagfishes. The name cyclostomata means "round mouths". Their mouths cannot close due to the lack of a jaw, so they have to constantly cycle water through the mouth.
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