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The complete circular mitochondrial genome (mitogenome) of Rhadinosa nigrocyanea was 17,965 bp in length, which contained 2 ribosomal RNA genes, 22 transfer RNAs, 13 protein-coding genes (PCGs) and 1 non-coding AT-rich region with the length of 3002 bp. All of the 22 tRNA genes displayed a typical clover-leaf structure, with the exception of tRNASer (TCT). 12 PCGs were initiated by ATN codons, except for ND1 started with TTG. Only six PCGs used the typical stop codon ‘TAA’ and ‘TGA’, while seven PCGs terminated with incomplete stop codons (TA or T). Phylogenetic analysis showed that R. nigrocyanea grouped with Cassidinae species, sister to Clytrinae + Cryptocephalinae.