The authors use ecospace modelling to quantify ecological disparity across all Mesozoic marine tetrapods documenting the explosive radiation of marine tetrapod groups throughout the Triassic. After the Late Triassic extinctions high levels of ecological disparity were again achieved by the Late Jurassic and ecospace became saturated by the Late Cretaceous. Established groups remained ecologically conservative and did not explore occupied or vacant niches throughout the Mesozoic.
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