Only 2 families of Temnspondyl survived
the Triassic - Jurassic mass extinction. These were the two Gondwanan
families, Brachyopidae and Chigutosauridae.
The Brachyopidae survived
and flourished in China, whilst the Chigutosauridae survived throughout
Gondwana. Both groups grew to large sizes throughout the Jurassic.
The latest known fossil Temnospondyl is Koolasuchus
It is a giant Chigutosaur measuring up to 5m in length. It is
known from the middle Cretaceous of Australia originating 140Mya and
disappearing 112Mya. It is suggested that it survived for this length
of time by living in rift valleys in conditions that the crocodilians
couldn't survive in. Pehaps it survived the cold weather by hibernating
like some modern day amphibians do. Perhaps it also fed in a similar
way. Koolasuchus had a very large head and mouth and it is possible
that it wasa an ambush predator that sucked water and prey into its
mouth by opening its mouth very quickly.
While this card is accurate in many respects, it is also wrong in a
few. Note that this is not a Crocodile, no matter how tempting it may
be to "put the Kool in crocodile
It is also highly unlikely that it weighed 3.5tonnes. It is more likely to weigh around half a ton.