Phylogenetic relationships of bitterlings based on mitochondrial 12S ribosomal DNA sequences |
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Authors: | M Okazaki K Naruse A Shima R Arai |
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Institution: | Department of Biological Sciences, Graduate School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan |
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Abstract: | Analysis of the nucleotide sequence of the mitochondrial 12S ribosomal RNA gene of 27 species or sub-species of bitterlings showed that bitterlings comprise an Acheilognathus clade and a Tanakia-Rhodeus clade, partially supporting an earlier classification based on morphology and karyology. The monophyly of Acheilognathus is confirmed, but that of Tanakia and Rhodeus remains poorly resolved. Within the Tanakia–Rhodeus clade, all species or sub-species having a diploid chromosome number of 46 form a monophyletic group. Results support the hypothesis that evolutionary trends of bitterling karyotypes involve reduction from 2 n =48 to either 2 n =44 (by Robertsonian translocation) or 2 n =46 (by non-Robertsonian translocation). |
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Keywords: | Acheilognathinae Cyprinidae molecular phylogeny 12S rDNA karyotype evolution |
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