The first complete mitochondrial genome of <i>Synandwakia multitentaculata</i> (Actiniaria, Andvakiidae)

The complete mitochondrial genome of <i>Synandwakia multitentaculata</i>, a marine protected species endemic to the western coast of Korea, was sequenced and analyzed. The circular mitogenome is 18,350 bp with AT-rich composition (G + C content: 34.3%) and contains 17 genes: 13 protein-coding genes (PCGs), two ribosomal RNAs , and two tRNAs. All PCGs are encoded on the heavy strand and initiate with ATG. The mitogenome shows characteristic Actiniaria split-gene architecture in <i>COX1</i> and <i>ND5</i>, with <i>ND1</i> and <i>ND3</i> located within the <i>ND5</i> intron. Phylogenetic analysis of 13 PCGs placed <i>S. multitentaculata</i> with <i>Diadumene lineata</i> within Metridioidea, providing the first mitochondrial genomic resource for <i>Synandwakia</i> and the family Andvakiidae.