This study presents the first complete mitochondrial genome of Calappa japonica Ortmann, 1892, the fourth genetic resource for the family Calappidae. Its mitogenome (GenBank: PX866701) is 15,773 bp in length and comprises 13 protein-coding genes (PCGs), two rRNA genes, 22 tRNA genes, and one control region (D-loop). Nucleotide composition analysis showed a high AT content (69.3%), with adenine (34.5%) and thymine (34.8%) dominating. Phylogenetic analysis grouped C. japonica with C. granulata and C. rissoana in a monophyletic clade, with C. bilineata as the sister to this clade. This work provides mitochondrial genomic resources for future studies on Calappidae systematics and species identification.
Zhao et al. (Fri,) studied this question.