Complete mitochondrial genome of the stonefly Cryptoperla stilifera Sivec (Plecoptera: Peltoperlidae) and the phylogeny of Polyneopteran insects

•Cryptoperla stilifera mitogenome was the first sequenced complete mtDNA of family Peltoperlidae.•CR of C. stilifera had many Poly N and two stem-loops with two interlink.•Three CSBs were present in CR of C. stilifera, Peltoperla tarteri and Peltoperla arcuata.•Both ML and BI analyses supported Grylloblattodea as the sister group to Plecoptera + Dermaptera.•Both ML and BI analyses supported Embiidina and Phasmatodea were sister groups.

We present the complete mitogenome of a stonefly, Cryptoperla stilifera Sivec (Plecoptera; Peltoperlidae). The mitogenome was a circular molecule consisting of 15,633 nucleotides, 37 genes and a A + T-rich region. C. stilifera mitogenome was similar to Pteronarcys princeps mitogenome (Plecoptera; Pteronarcyidae). All transfer RNA genes (tRNAs) had typical cloverleaf secondary structures except for trnSer (AGN), where the stem-loop structure of the dihydrouridine (DHU) arm was missing. The A + T-rich region of C. stilifera had two stem-loops and each had two interlink. Three conserved sequence blocks (CSBs) were present in the A + T-rich regions of C. stilifera, Peltoperla tarteri and Peltoperla arcuata. Moreover, many polynucleotide stretches (Poly N, N = A, T and C) in the A + T-rich region of C. stilifera Phylogenetic relationships of Polyneopteran species were constructed based on the nucleotide sequences of 13 protein coding genes (PCGs). Both maximum likelihood (ML) and Bayesian inference (BI) analyses supported Grylloblattodea as the sister group to Plecoptera + Dermaptera and Embiidina and Phasmatodea as sister groups.