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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The back of the neck of C. cataphractus showing the arrangements of post-occipital and nuchal scales. The photograph clearly shows four post-occipital scales behind the head, adjacent to six nuchal scales (four large scales in a square, anterior to two much smaller scales).

Photograph © Adam Britton

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Head of juvenile crocodile

Head of adult crocodile

Post-occipital and nuchal scales