Alligator

Alligator mississipiensis

Classification:

Phylum-chordata

Group-vertebrata

Class-Reptilia

Order-Crocodilia

Genus-Alligator

Species-Alligator mississipiensis

 

Geographical distribution: Alligator mississipiensis  is found in the rivers of southern states of north america and A. sinensis occurs in the rivers of china.

Alligator-mississipiensis

Characteristics:

  1. Head is broad with short, broasd and rounded snout.
  2. Body is covered with an exoskeleton of horny epidermal scales.
  3. The general color is greenish-black or dark-brown above and yellowish below.
  4. It measures two and a half to three and a half metres in length.
  5. Limbs pentadactyle with five fingers and four toes.
  6. The fingers are half-webbed and the toes are two-third webbed.
  7. The tail is laterally compressed.
  8. Mandibular symphysis is short extending only to the level of fourth or fifth tooth.
  9. Fourth mandibular tooth fits into a pit in the  upper jaw.
  10. On either side 17-18 teeth in the upper jaw and 18-20 teeth in the lower jaw.
  11. The nasal bones divide the nasal groove by a median bony septum.
  12. The dorsal shield is formed by 6or 8 longitudinal series of keeled bony scutes.
  13. The neck is protected by two pairs of large scutes.
  14. Alligator mississipiensis is predators.

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