Both the start and end of the period are marked by major extinction events.The Triassic began in the wake of the Permian–Triassic extinction event, which left the earth's biosphere impoverished; it would take well into the middle of this period for life to recover its former diversity.
Therapsids and archosaurs were the chief terrestrial vertebrates during this time.
A specialized subgroup of archosaurs, called dinosaurs, first appeared in the Late Triassic but did not become dominant until the succeeding Jurassic Period.
Without jaws means they had no bones in their mouths and they could not bite the way modern vertebrates do, they did eat however and they did have mouths.
Even the earliest Agnathans had recognisable heads with a brain of some sort, two or more eyes and a notochord persistent throughout their lives.
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The global climate during the Triassic was mostly hot and dry, with deserts spanning much of Pangaea's interior.
However, the climate shifted and became more humid as Pangaea began to drift apart.
These animals, our very distant ancestors, were extremely different to the fish we know today. There are still some species of fish living today that have this feature, a lack of jaws, and which are, therefore, a part of this group.