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Hippos stem from the longest sequence of terrestrial cetartiodactyl evolution in Africa
According to molecular data, hippopotamuses and cetaceans form a clade excluding other extant cetartiodactyls. Despite a wealth of spectacular specimens documenting cetacean evolution, this relationship remains poorly substantiated by the fossil record. Indeed, the evolutionary path leading from the hippo-cetacean ancestor to Hippopotamidae is plagued by missing fossil data and phylogenetic uncertainties. Only an origination within the extinct anthracotheres is compatible with moleculardoi:10.1038/ncomms7264 pmid:25710445 fatcat:j5s6mfj4qzaalfglz3ym3elacy