State the difference between agnatha and Gnathostomata.

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answered Dec 25, 2019 by MukundJain (94.6k points)
edited Dec 28, 2023 by Vikash Kumar

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Agnatha

Gnathostomata

1. Mouth is circular and without jaws.

2. Paired appendages are not present.

3. Notochord is present throughout life.

4. There are 8 or 10 pairs of cranial nerves.

5. Only a single median nostril is present.

6. There are no organized pancreas and spleen.

7. They are cold blooded.

1. Mouth has jaws

2. Paired appendages (fins and limbs) may be present.

3. Notochord is present in the embryonic stage and in adult it is replaced by a vertebral column.

4. There are 10 or 12 pairs of cranial nerves.

5. Paired nostrils are present.

6. Pancreas and spleen are present as distinct organs.

7. They may be cold-blooded or warm blooded animals.