| Summary: | Trichagalma acutissimae (Monzen) (Hymenoptera: Cynipidae) is a major pest of Quercus variabilis Blume in the Taihang Mountains in China. In this study, we sequenced and analyzed the mitochondrial genome (mitogenome) of T. acutissimae. This mitogenome was 16,078 bp long and encoded 13 protein-coding genes (PCGs), 22 transfer RNA genes (tRNAs), and 2 ribosomal RNA unit genes (rRNAs). The whole mitogenome exhibited heavy AT nucleotide bias (86.2%). Except for nad4L that started with TTG, all other PCGs started with the standard ATN codon. All 13 PCGs terminate with the stop codon TAA. Phylogenetic analysis showed that T. acutissimae got together with Synergus sp. with high support value, indicating the close relationship of these two genus. All five Cynipoidea species constituted a major clade and formed a sister group to Proctotrupoidea and Chalcidoidea.
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