Abstract

We propose here a short synthesis of the saurischian evolutionary history. Our knowledge of the diversity and evolution of the saurischian non-avian dinosaurs has increased during the past decade. The generalized use of cladistics has led to various phylogenetic hypotheses, some of them in agreement on the evolution of saurischians, even if some controversy remains. The saurischian evolution is closely linked to two of the five great mass extinctions, which punctuated life history, but probably also to a third, less important, extinction event at the end of the Early Jurassic.

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