The first crocodilians were called Protosuchians, they lived in the late Triassic to early Jurassic
times. All of todays crocodilians are ancestors of Isisfordia.
Lets go ahead and start with the biggest.
It just so happens to be the most known of all the prehistoric crocs. The scientific name is Sarocosuchus imperator but
is known as SuperCroc. The fossil remains were discovered in 2000 in the Saharan Desert in Africa. The skull measured six
feet. The animal is estimated at 40 feet long and weighing more than ten tons. This is the largest crocodilian ever discovered.
Baurusuchus salgadoensis was discovered
in a southeastern part of Brazil. It was discovered that it lived 90 million years ago. This species had long legs and spent
most of its time walking on land. This is very different from todays modern day crocodilians. It grow to around ten feet and
900 pounds.
This is just the information I know of the top of my head. I will post more after I do research
More information coming.....