Write the general characters of the class Cyclostomata. - Vidyadip

Question

Write the general characters of the class Cyclostomata.

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Answer

They are primitive, poikilothermic, jawless aquatic vertebrates.
Body is slender and eel-like with six to fifteen pairs of gill slips.
The mouth is circular without jaws and suctorial.
Heart is two-chambered. Closed types of circulation are seen.
No paired appendages.
Cranium and vertebral column are cartilaginous, e.g. Petromyzon.

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