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FAMILY:
ALLIGATORIDAE

A. mississippiensis
A. sinensis
C. crocodilus
C. c. apaporiensis
C. c. fuscus
C. latirostris
C. yacare
M. niger
P. palpebrosus
P. trigonatus

FAMILY:
CROCODYLIDAE

C. acutus
C. intermedius
C. johnstoni
C. mindorensis
C. moreletii
C. niloticus
C. novaeguineae
C. palustris
C. porosus
C. rhombifer
C. siamensis
M. cataphractus
O. tetraspis
T. schlegelii

FAMILY:
GAVIALIDAE

G. gangeticus

DICHOTOMOUS KEY
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Alligator mississippiensis

An aerial view of a sub-adult alligator, providing a good overview of its general morphology. Colour is also notably very dark, and the bright yellow cross-banding seen in younger juveniles is no longer apparent. The pattern of dorsal scutes along the back of the animal can also be made out. The smallish scutes behind the head are termed 'post-occipital', adjacent to the larger 'nuchal' scutes, which run into the 'dorsal' scutes which cover the back of the thorax and abdomen. The 'double-caudal' verticels along the tail eventually give way to 'single-caudal' verticels which run to the tip of the tail. The difference in size between front and rear feet can also be seen from this photograph, including the fact that webbing between the toes of the back feet is extensive, but much less so between the toes of the front feet (unlike A. sinensis in which there is none).

Photograph © Adam Britton

ALL IMAGES:
[click on image for enlargement]

Click Alligator habitat in Florida Everglades Click Basking alligator on grass Click Drawing of adult alligator
Click Alligator on grass behind tree Click Sub-adult basking on floating log Click Leucistic hatchling (b&w)
Click Head of large adult Click Head of swimming adult Click Front view of adult asleep on sand
Click Adult floating in water Click Sub-adult basking on floating log Click Head silhouette in water
Click Leucistic adult alligator Click Dorsal view of elongated alligator head Click Top-down view of sub-adult alligator
Click Tightly-packed sub-adults in water Click Close-up of juvenile alligator eye Click Close-up of juvenile alligator head





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