Here, we sequenced the complete mitogenome of Parasesarma eumolpe (Brachyura: Grapsoidea: Sesarmidae) forthe first time. The characteristics of this newly sequenced mitogenome were described and compared with otherSesarmidae species. The 15646-bp mitogenome contains 13 protein-coding genes (PCGs), two ribosomal RNAgenes (rRNAs), 22 transfer RNA genes (tRNAs), and an A-T rich region. All of the PCGs are initiated by the startcodon ATN and terminated by the standard TAN codon or an incomplete T. The pairwise Ka/Ks ratio analysisshows that all 13 PCGs are under purifying selection, whereas the ATP8 gene is an outlier, with pairwisecomparison values ranging from neutral selection (0.000) to positive selection (1.039). The gene arrangement of P.eumolpe compared with ancestral Decapoda shows the translocation of two tRNAs (tRNA-His and tRNA-Gln),which is identical to other Sesarmidae species. Phylogenetic analyses show that all Sesarmidae species are placedinto one group, and the polyphyly of Eriphioidea, Ocypodoidea, and Grapsoidea is well supported. Therelationship between gaps in the QIM region and the phylogeny of Sesarmidae is analyzed. It is obvious that boththe G5 (the gap between Q and I) and G6 (the gap between I and M) decrease progressively with the evolutionprocess. These results will help to better understand the genomic evolution within Sesarmidae and provideinsights into the phylogeny of Brachyura.

Ying Zhang;Lei Meng;Liming Wei;Bingjian Liu;Liqin Liu;Zhenming Lü;Yang Gao;Li Gong

National Engineering Laboratory of Marine Germplasm Resources Exploration and Utilization, Zhejiang Ocean University, Zhoushan 316022, China;Marine Science and Technology College, Zhejiang Ocean University, Zhoushan 316022, China;School of Fishery, Zhejiang Ocean University, Zhoushan 316022, China

海洋学报（英文版）

[1]Ying Zhang;Lei Meng;Liming Wei;Bingjian Liu;Liqin Liu;Zhenming Lü;Yang Gao;Li Gong-.Comparative mitochondrial genome analysis of Sesarmidae and its phylogenetic implications)[J].海洋学报（英文版）,2022(08):62-73,中插7-中插21

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