The complete mitochondrial genome of Euchiloglanis davidi and its phylogenetic implications

Euchiloglanis davidi, an endemic species to China, is mainly distributed in the upper Yangtze River and its tributaries. In this study, the complete mitochondrial genome of E. davidi was first sequenced. The result showed that the circular mitogenome was 16,559 bp in length and contained 13 protein-coding genes (PCGs), 22 transfer RNA (tRNA) genes, two ribosomal RNA (rRNA) genes, one origin of replication on the light-strand, and one control region. These genes were in the same order as in other vertebrate species. Except ND6 and eight tRNA genes, most mitochondrial genes were encoded on the H-strand. The whole mitogenome base composition of 31.18% A, 25.12% T, 28.09% C, 15.61% G, with 56.30% AT. Phylogenetic analyses using concatenated nucleotide sequences of the 13 protein-coding genes with two different methods (Maximum likelihood and neighbor-joining analysis) both highly supported that E. davidi showed a close relationship with E. kishinouyei. This work provides basic genetic data of E. davidi which will be helpful for further researches on conservation biology and species identification.