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Simplified phylogenetic relationships in the non-archosauriform archosauromorph to archosauriform transition showing the possible direction of heterochronic changes that contributed to the evolution of overall skull shape. Note the similarities between the juvenile skull of Proterosuchus fergusi and the adult of Prolacerta broomi, and the adult of P. fergusi and an adult erythrosuchid (based on Garjainia prima). Scale bars: 5 cm.
