Their remains were uncovered in the Sahara by one of the world's greatest fossil hunters, Dr Paul Sereno of Chicago University, who in 2001 discovered the ' supercroc' - an eight ton, 40ft monster that lived at the time of the dinosaurs.
The latest haul includes new species with an astonishing array of snouts and teeth. The most ferocious is the 'Boar Croc', a 20ft meat eater with an armoured snout for ramming its prey and three sets of daggershaped fangs for slicing up meat.
Similarly long was the 'Pancake Croc', a squat fish eater with a 3ft-long pancakeflat head which rested motionless for hours, its jaws open, waiting for prey.
There were three other snappy little devils, each about three feet long.
The 'Rat Croc' was a plant and grub eater whose buckteeth were used to dig for food, while the 'Duck Croc' had a broad, overhanging snout with which it rooted around in shallow water and mudbanks for fish and grubs.
Finally, the 'Dog Croc' ate plants and grubs, had a soft dog-like nose and was probably a good swimmer and fast runner.
Most of the crocodiles were found lying on the surface of a remote, windswept stretch of rock and dunes.
For more information related to dinosaurs, visit rareresource.com.
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