The complete mitochondrial genome of Izuka (Annelida: Polychaeta): an evidence of conservativeness between gene arrangement and phylogenesis in .

The complete mitochondrial genome of Izuka (Annelida: Polychaeta) was presented, which is a circular molecule of 15,930 bp nucleotides. It encodes 37 genes, including 13 PCGs, 22 tRNAs, and two rRNAs. The length of non-coding regions is 1428 bp, and the longest one (1346 bp) is speculated as the control region, which is located between and and is longer than most species in . The complete mitogenome of . Izuka consists of 31.2% A, 23.6% C, 12.9% G, and 32.2% T, which has T vs. A skew (-0.02) and C vs. G skew (-0.29), respectively. Phylogenetic analysis indicates the classification status of Izuka and the relationship with other species in , which is closer with and (bootstrap = 100). By comparisons, the gene arrangement of Izuka and other seven species in are identical and they also cluster together in phylogenetic tree with higher support rate, which indicates the conservativeness between gene arrangement and phylogenetic analysis in . In conclusion, the complete mitochondrial genome of Izuka can provide supportive data for further molecular and evolutionary analysis of .