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Write the general characters of the clas...

Write the general characters of the class Cyclostomata.

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