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Hippos stem from the longest sequence of terrestrial cetartiodactyl evolution in Africa

Author

Listed:
  • Fabrice Lihoreau

    (Institut des Sciences de l’Evolution de Montpellier, Université Montpellier II, CNRS, IRD)

  • Jean-Renaud Boisserie

    (IPHEP, UMR CNRS 7262, Université de Poitiers
    CFEE, USR CNRS 3137, French Ministry of Foreign Affairs, Embassy of France to Ethiopia, P.O. Box 5554, Addis Ababa, Ethiopia)

  • Fredrick Kyalo Manthi

    (Palaeontology Section)

  • Stéphane Ducrocq

    (IPHEP, UMR CNRS 7262, Université de Poitiers)

Abstract

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 molecular results, substantial filling of phyletic gaps and recent discoveries of early Miocene hippopotamids. Yet, the anthracothere stock that gave rise to Hippopotamidae has not been identified. Consequently, recent phylogenetic accounts do not properly integrate the anthracotheriid hypothesis, and relate Hippopotamidae to a stretched ghost lineage and/or close to Suina. Here we describe a new anthracothere from Lokone (Kenya) that unambiguously roots the Hippopotamidae into a well-identified group of bothriodontines, the first large mammals to invade Africa. The hippos are deeply anchored into the African Paleogene.

Suggested Citation

  • Fabrice Lihoreau & Jean-Renaud Boisserie & Fredrick Kyalo Manthi & Stéphane Ducrocq, 2015. "Hippos stem from the longest sequence of terrestrial cetartiodactyl evolution in Africa," Nature Communications, Nature, vol. 6(1), pages 1-8, May.
  • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms7264
    DOI: 10.1038/ncomms7264
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