Abstract
The complete mitogenome sequence of Amur bitterling (Rhodeus sericeus) was determined using long PCR. The genome was 16,581 bp in length and contained 13 protein-coding genes, 2 ribosomal RNA genes, 22 transfer RNA genes, 1 origin of L strand replication and 1 control region. The overall base composition of the heavy strand was A (28.9%), C (27.2%), T (26.6%), and G (17.3%). The control region was 925 bp in length and the A + T content of the region was 63.5%. The extended termination-associated sequence domain, the central conserved domain and the conserved sequence block domain are defined in the mitochondrial genome control region of Amur bitterling. Mitochondrial genome analyses based on MP, ML, NJ and Bayesian analyses yielded identical phylogenetic trees, indicating a close phylogenetic affinity to the 13 Cyprinidae species. It appeared that no less than three major phyletic lineages were present in Cyprinidae. A clade (Rhodeus and Tanakia) with the R. lighti and R. Sinensis as the sister taxon to Acheilognathus was supported by bootstrap values of 100%. The close relationship of Amur bitterling to other Rhodeus species, especially R. pseudosericeus, is consistent with the results confirmed using morphology analysis.
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