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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Adult Nile crocodile portrait. The overlapping teeth characteristic of crocodilians can be seen clearly from this picture, although this animal is missing the large lower 4th tooth nearest the camera. The scales around the mouth are pitted with "integumentary sense organs" which have a mechanosensory role. The raised nostrils at the tip of the snout are also visible.

Photograph © Adam Britton

ALL IMAGES:
[click on image for enlargement]

	Sub-adult head amongst a group		Head of adult from above (b&w)		Adult basking on grass
	Detailed adult head portrait (b&w)