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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This photograph shows a subadult Tomistoma, captured on the Merang River, Sumatra, being measured by a local wildlife officer. Studies on the distribution of animals, and the size structure of animals within a population over time, can give researchers valuable information on how a species is faring within an ecosystem. Such studies are necessary on a fairly regular basis, to assess longterm changes and to be able to act on new information if it necessitates action.

Photograph courtesy of Mark Bezuijen

ALL IMAGES:
[click on image for enlargement]

	Top down view of adult Tomistoma head		Adult Tomistoma in Indonesia		Subadult Tomistoma from Sumatra
	Tomistoma egg		Well developed embryo		Large adult by canoe in Sumatra
	Subadult being measured