Abstract
Mitochondrial genome (mitogenome) is very important to understand molecular evolution and phylogenetics. Herein, in this study, the complete mitogenome of Sesarmops sinensis was reported. The mitogenome was 15,905 bp in size, and contained 13 protein-coding genes (PCGs), two ribosomal RNA (rRNA) genes, 22 transfer RNA (tRNA) genes, and a control region (CR). The AT skew and the GC skew are both negative in the mitogenomes of S. sinensis. The nucleotide composition of the S. sinensis mitogenome was also biased toward A + T nucleotides (75.7%). All tRNA genes displayed a typical mitochondrial tRNA cloverleaf structure, except for the trnS1 gene, which lacked a dihydroxyuridine arm. S. sinensis exhibits a novel rearrangement compared with the Pancrustacean ground pattern and other Brachyura species. Based on the 13 PCGs, the phylogenetic analysis showed that S. sinensis and Sesarma neglectum were clustered on one branch with high nodal support values, indicating that S. sinensis and S. neglectum have a sister group relationship. The group (S. sinensis + S. neglectum) was sister to (Parasesarmops tripectinis + Metopaulias depressus), suggesting that S. sinensis belongs to Grapsoidea, Sesarmidae. Phylogenetic trees based on amino acid sequences and nucleotide sequences of mitochondrial 13 PCGs using BI and ML respectively indicate that section Eubrachyura consists of four groups clearly. The resulting phylogeny supports the establishment of a separate subsection Potamoida. These four groups correspond to four subsections of Raninoida, Heterotremata, Potamoida, and Thoracotremata.
Highlights
The Brachyura mostly live in littoral regions of tropical shallow seas and about 7000 species have been described and is the most species rich infraorder within Decapoda [1]
The S. sinensis mitogenome is a closed circular molecule of 15,905 bp in length. It has been deposited in GenBank under the accession number KR336554 and contains typical animal mitochondrial genes, including 13 protein-coding genes (PCGs), 22 transfer RNA (tRNA) genes, a large ribosomal RNA
This study presents one mitogenome of S. sinensis
Summary
The Brachyura mostly live in littoral regions of tropical shallow seas and about 7000 species have been described and is the most species rich infraorder within Decapoda [1]. Four groups of Brachyura (Dromiacea, Raninoida, Heterotremata and Thoracotremata) were recognized [3,4,5]. Heterotremata and Thoracotremata should be attributed to Eubrachyura, which is a sisiter group to Dromiacea [6,7]. Animal mitochondrial DNA (mtDNA), a double-stranded circular molecule, ranging from 14 to 19 kilobases (kb) in size, containing 37 genes, including 13 PCGs, ATPase subunits 6 and 8 of the ATPase (atp and atp8), cytochrome c oxidase subunits 1–3 (cox1–cox3), cytochrome B (cob), NADH dehydrogenase subunits 1–6 and 4 L (nad and nad4L), 22 tRNA genes, two rRNA genes and CR [8]. Using complete mitogenomes is becoming increasingly common for phylogenetic reconstruction [9,10,11]. It is becoming increasingly common to use complete animal mitogenomes for phylogenetic reconstruction [9,10,11]
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