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A genomic exploration of the early evolution of extant cats and their sabre-toothed relatives. | LitMetric
The evolutionary relationships of Felidae during their Early-Middle Miocene radiation is contentious. Although the early common ancestors have been subsumed under the grade-group this group is thought to be paraphyletic, including the early ancestors of both modern cats and extinct sabretooths. Here, we sequenced a draft nuclear genome of dated to 13,182 ± 90 cal BP, making this the oldest palaeogenome from South America to date, a region known to be problematic for ancient DNA preservation. We analysed this genome, together with genomes from other extinct and extant cats to investigate their phylogenetic relationships. We confirm a deep divergence (~20.65 Ma) within sabre-toothed cats. Through the analysis of both simulated and empirical data, we show a lack of gene flow between and contemporary Felidae. Given that some species traditionally assigned to originated in the Early Miocene ~20 Ma, this indicates that some species of may be younger than the lineages they purportedly gave rise to, further supporting the hypothesis that was paraphyletic.
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