A molecular timescale for the evolution of the African freshwater fish family Kneriidae (Teleostei: Gonorynchiformes) |
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Authors: | Sébastien Lavoué Masaki Miya Timo Moritz Mutsumi Nishida |
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Institution: | (1) Institute of Oceanography, National Taiwan University, No.1, Sec. 4 Roosevelt Rd., Taipei, 10617, Taiwan;(2) Atmosphere and Ocean Research Institute, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa Chiba, 277-8564, Japan;(3) Natural History Museum and Institute, Chiba, 955-2 Aoba-cho, Chuo-ku, Chiba 260-8682, Japan;(4) German Oceanographic Museum, Katharinenberg 14-20, 18439 Stralsund, Germany |
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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. |
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Keywords: | |
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