The complete mitochondrial genome (mitogenome) of Opistoplatys sp. was 
determined, which was the first representation from the assassin bug subfamily 
Tribelocephalinae. The mitogenome is a typical circular DNA molecule of 
15,615 bp and contains 37 genes and a putative control region. All the 13 
protein-coding genes initiate with ATN codons and mostly terminate with TAA or 
TAG codons except for COII, COIII, and ND5 genes use a single T residue as the 
termination codon. All the 22 tRNAs have the clover-leaf structure except for 
the tRNASer(AGN) with the length ranging from 60 to 72 bp. The control region is 
1068 bp in length and includes 456 bp tandem repeat sequence with four 94-bp 
tandem repeat units and a partial fifth (80 bp). In the sampled subfamilies of 
Reduviidae, Peiratinae + the remaining subfamilies, Triatominae + Stenopodainae, 
Tribelocephalinae + Ectrichodiinae, are recovered in phylogenetic analyses with 
high supports.