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Ichthyological Research

, Volume 59, Issue 2, pp 104–112 | Cite as

A molecular timescale for the evolution of the African freshwater fish family Kneriidae (Teleostei: Gonorynchiformes)

  • Sébastien LavouéEmail author
  • Masaki Miya
  • Timo Moritz
  • Mutsumi Nishida
Full Paper

Abstract

We re-examine the phylogenetic relationships of the family Kneriidae using whole mitogenome sequences across all four kneriid genera including the two recently recognized species of Cromeria (C. nilotica and C. occidentalis), and we provide a timescale to discuss the evolution of the family. The resulting phylogeny supports the monophyly of the family Kneriidae and the monophyly of the genus Cromeria. The two Cromeria species exhibit large genetic divergence (18.2%) that is comparable to those between Grasseichthys gabonensis and each two Cromeria species (16.9 and 19.0%). The three paedomorphic kneriid species (C. occidentalis, C. nilotica and G. gabonensis) do not form a monophyletic group, but the alternative hypothesis in which they are monophyletic cannot be statistically rejected. Two alternative relaxed molecular-clock Bayesian analyses, differing on how we time-calibrated the phylogenetic tree using the fossil record, support a Late Jurassic or Late Cretaceous origin of the African freshwater gonorynchiforms. The early diversification of the family Kneriidae is concomitant with the reductions or loss of several morphological characters that took place in a relatively short time interval of about 12–21 million years either during the Eocene or at the end of the Late Cretaceous.

Keywords

Mitogenomics Evolution Paedomorphism Miniaturization 

Notes

Acknowledgments

This study was supported by research grant nos. 16570082, 15380131 and 19207007 from the Japan Society for the Promotion of Science. SL completed this work while he was supported by a postdoctoral fellowship of the Taiwan’s National Science Council (NSC100-2811-M-002-069). We warmly thank John P. Sullivan, John P. Friel and Tesfaye Melak for their help during field survey in Ethiopia. The collection and exportation permits were obtained with the assistance of Abebe Getahun (Addis Ababa University). An early draft of this manuscript was significantly improved by comments of Casey B. Dillman (Virginia Institute of Marine Science), Shigeru Shirai (IR section editor) and two anonymous reviewers. Any experiments in this study complied with the current laws of Japan where they were performed.

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Copyright information

© The Ichthyological Society of Japan 2011

Authors and Affiliations

  • Sébastien Lavoué
    • 1
    • 2
    Email author
  • Masaki Miya
    • 3
  • Timo Moritz
    • 4
  • Mutsumi Nishida
    • 2
  1. 1.Institute of OceanographyNational Taiwan UniversityTaipeiTaiwan
  2. 2.Atmosphere and Ocean Research InstituteThe University of TokyoKashiwaJapan
  3. 3.Natural History Museum and Institute, ChibaChibaJapan
  4. 4.German Oceanographic MuseumStralsundGermany

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