| Summary: | In this paper, we first report the complete mtDNA sequence of Opsarius caudiocellatus with the main aim of providing a basis for further researches of this species. Assembly circular mitogenome was 16,534 bp long encoded 13 protein-coding genes, two ribosomal RNA genes, 22 transfer RNA genes, and one control region. The gene nucleotide composition was estimated to be 28.1% A, 25.2% T, 18.6% G, 28.1% C. A maximum-likelihood (ML) phylogenetic tree was reconstructed using the 13 concatenated mitochondrial protein-coding genes of O. caudiocellatus and other 19 species of the subfamily Chedrinae. Result of the phylogenetic analysis revealed that O. caudiocellatus was well grouped with Barilius barila. This study could enrich genetic resources and be helpful to studies on evolution and conservation genetics for O. caudiocellatus.
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