After the Triassic–Jurassic extinction event, the first semiaquatic crocodylomorphs, which lived partly on land and partly in water, appeared. These were followed soon after by the first marine crocodylomorphs, the thalattosuchians. Thalattosuchia was the pinnacle of marine specialization among crocodylomorphs. First appearing within 10 million years of the Triassic–Jurassic extinction event, they continued well into the Early Cretaceous, with the most recent known thalattosuchian fossil approximately 125 million years old. The early thalattosuchians looked similar to living Indian gharials: they were semiaquatic, longsnouted and probably fed on smallbodied fish. These forms would ultimately give rise to species that could swim in the open ocean and looked more like today’s dolphins and killer whales.


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