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1 January 2020 A New Species of Nyanzachoerus (Mammalia, Artiodactyla, Suidae, Tetraconodontinae) from the Upper Miocene Nakali Formation, Kenya
Takehisa Tsubamoto, Yutaka Kunimatsu, Tetsuya Sakai, Mototaka Saneyoshi, Daisuke Shimizu, Naoki Morimoto, Hideo Nakaya, Naoto Handa, Yoshiki Tanabe, Fredrick Kyalo Manthi, Masato Nakatsukasa
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Abstract

A new species of Nyanzachoerus (Mammalia, Artiodactyla, Suidae, Tetraconodontinae), Nyanzachoerus nakaliensis, is described on the basis of gnathodental specimens from the basal upper Miocene Nakali Formation (ca. 10 Ma) of central Kenya. Ny. nakaliensis is characterized by a lower crown height and relatively weaker furrows of the molars and proportionally larger P3–P4 compared to M3 among the species of the genus. It is the oldest and morphologically most primitive species of the genus. It shows close morphological similarities of the dentition with the Pliocene Asian tetraconodontine genus Sivachoerus, implying a possible closer phyletic relationship of Sivachoerus prior with Ny. nakaliensis rather than with Nyanzachoerus tulotos or Nyanzachoerus devauxi. This phyletic relationship implies a possibility that S. prior diverged from a stock of Ny. nakaliensis during the early late Miocene (Tortonian) in East Africa and then the lineage moved from East Africa to Asia. Finally, it should be stressed that there seems to be a problem of the paraphyly of the genus Nyanzachoerus.

© by the Palaeontological Society of Japan
Takehisa Tsubamoto, Yutaka Kunimatsu, Tetsuya Sakai, Mototaka Saneyoshi, Daisuke Shimizu, Naoki Morimoto, Hideo Nakaya, Naoto Handa, Yoshiki Tanabe, Fredrick Kyalo Manthi, and Masato Nakatsukasa "A New Species of Nyanzachoerus (Mammalia, Artiodactyla, Suidae, Tetraconodontinae) from the Upper Miocene Nakali Formation, Kenya," Paleontological Research 24(1), 41-63, (1 January 2020). https://doi.org/10.2517/2019PR004
Received: 5 June 2018; Accepted: 11 March 2019; Published: 1 January 2020
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KEYWORDS
Africa
mammalian fauna
MN10
MN9
Nyanzachoerus nakaliensis
Sivachoerus
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