Figure 1

Gene map of the complete mitogenomes of Clithon oualaniense (GenBank accession No. MT568501), Clithon sowerbianum (MT230542), Nerita chamaeleon (MT161611) and Nerita japonica (MN747116). The ring indicates the gene arrangement and distribution. The largest ring is for C. oualaniense, and the smallest ring is for N. japonica. ND1-6 NADH dehydrogenase subunits 1–6, COX1-3 cytochrome c oxidase subunits 1–3, ATP6 and ATP8 ATPase subunits 6 and 8, CYTB cytochrome b, rRNA ribosomal RNA gene, tRNA transfer RNA gene.