The complete mitochondrial genome of the <i>Tanichthys flavianalis</i> (Cypriniformes: Tanichthyidae) and its phylogeny

In the present study, we have sequenced, annotated and characterized the complete mitogenome of <i>Tanichthys flavianalis</i> Li, Liao &amp; Shen, 2022, which is an endemic minnow to Hainan Province, China. The entire mitogenome size is 16,545 bp, containing 37 genes coding for 13 mitochondrial proteins, 22 tRNAs, 2 rRNAs, and one putative control region. It has the typical fish mitochondrial gene arrangement, though with 9 gene overlaps and 17 intergenic spacers scattering throughout the mitogenome, and a high A + T bias (60.8%) comparing to other Cyprinids. ATG is used as the start codon in most mitochondrial protein coding genes (PCGs) except for <i>cox1</i> which uses GTG, whereas the canonical TAA/TAG are prevailing stop codons except for <i>cox2</i>, <i>cox3</i>, <i>nad4</i> and <i>cytb</i>. Phylogenetic analyses with other reported species from Tanichyidae were conducted using IQ-TREE and MrBayes, based on the concatenated 13 PCGs. The results clustered <i>T. flavinalis</i> with the newly described <i>T. albiventris</i> Li Bohlen &amp; Liao, 2022, and proved the reciprocally monophyletic relationship between Chinese and Vietnamese <i>Tanichthys</i>.