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The mitochondrial genome (mitogenome) has been widely used as a molecular marker to investigate phylogenetic analysis and evolutionary history in fish. However, the study of mitogenomes is still scarce in the family   Bagridae  . In this study, the mitogenomes of    Tachysurus   brachyrhabdion    and    T.   gracilis    were sequenced, annotated, and analyzed. The mitogenomes were found to be 16,532 bp and 16,533 bp, respectively, and each contained 37 typical mitochondrial genes, which are 13 protein-coding genes ( PCGs ), 22  tRNA  genes, two  rRNA  genes, and a control region. All  PCGs  begin with the codon ATG, except for the cytochrome c oxidase subunit 1 (  COI  ) gene, while seven  PCGs  end with an incomplete termination codon. All  tRNA  genes can fold into their typical cloverleaf secondary structures, except for  tRNA  Ser(AGY) , which lacks the dihydrouracil arm. The Ka/Ks ratios for all  PCGs  are far lower than one. Phylogenetic analyses based on Bayesian inference ( BI ) and maximum likelihood ( ML ) showed that the two clades in   Bagridae   excluded    Rita   rita   . The monophyly of    Tachysurus    supports previous research and the traditional classification that    Leiocassis   ,    Pseudobagrus   ,    Pelteobagrus   , and    Tachysurus    belong to one genus (   Tachysurus   ). These findings provide a phylogenetic basis for future phylogenetic and taxonomic studies of   Bagridae  .

﻿Complete mitochondrial genomes of two catfishes ( Siluriformes , Bagridae ) and their phylogenetic implications

Complete mitochondrial genomes of two catfishes ( Siluriformes , Bagridae ) and their phylogenetic implications