Question

Difference between artiodactyla and perissodactyla

Answer 1

Comparison # Artiodactyls:

1. Horns:

Usually present. May be hollow or solid, located on frontal bone.



2. Digits:

Third and fourth digits are larger and bear hoofs. The axis of the limb pass­ hoofed. The axis of the limb passes between the Nos. 3 and 4 digits (Paraxonic condition).

3. Femur:

Third trochanter is absent.



4. Talus:

Has a flat surface.

5. Fibula:

Usually articulates with the calca­neum.

6. Nasals:

Not expanded posteriorly.

7. Alisphenoid canal:

Absent.

8. Dorsolumbar vertebrae:


19

9. Odontoid process:

Spout-like.

10. Incisors:

General tendency of suppression of upper incisors.

11. Canines:

May form tusks.

12. Premolars:

Not molarised.

13. First milk molar:

Not replaced.

14. Molars:

Hypsodont.

15. Stomach:

Complicated by forming different chambers.

16. Intestine:

Short

17. Caecum:

Small

18. Gall-bladder:

Present

19. Mammae:

Inguinal or abdominal

20. Placenta:

Diffuse or cotyledonary

Examples:

Sus, Camelus, Bos Capra , ovis , Axis axis.

Comparison # Perissodactyla:

1. Horns:

Mostly absent.

2. Digits:

Only the third digit is stout and down the third digit (Mesaxonic condition)

3. Femur:

Third trochanter is present.

4. Talus:

Does not articulate with the calca­neum.

5. Fibula:

Expanded posteriorly

6. Nasals:

Present

7. Alisphenoid canal:

Present

8. Dorsolumbar vertebrae:

More than 22

9. Odontoid process:

Peg-like.

10. Incisors:

Present and used for cropping.

11. Canines:

May be reduced or absent.

12. Premolars:

Resemble the molars.

13. First milk molar:

Replaced

14. Molars:

Bunodont and low crowned

15. Stomach:

Simple

16. Intestine:

Long

17. Cacum:

Large and sacculated

18. Mammae:

Diffuse

Example:

Equus zebra, Tapirus Rhinocerous Equae hemionus.







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