Complete mitochondrial genome characterization of the alligator pipefish Syngnathoides biaculeatus and phylogenetic analysis of family Syngnathidae

Complete mitochondrial genome and phylogenetic analysis of the Gray's pipefish Halicampus grayi Kaup 1856

In the present study, the complete mitochondrial genome of H. grayi was determined and annotated. The circular mitogenome is 16,959 bp in length and contains 13 protein-coding genes (PCGs), two rRNA genes, 22 tRNA genes, and a control region. Most of the PCGs start with ATG, but CO1 begins with a GTG start codon. Phylogenetic analysis revealed that H. grayi was strictly related to network pipefish Corythoichthys flavofasciatus with 100% bootstrap support value. This work provides basic molecular information that would be useful for further investigation on conservation genetics and evolutionary relationships of H. grayi.

Characterization of the complete mitochondrial genome of the medical pipefish Doryichthys boaja Bleeker 1850

In the present study, we reported the complete mitochondrial genome of medical pipefish Doryichthys boaja Bleeker 1850. The complete mitochondrial genome of D. boaja was 16,562 bp in length and had a base composition of A (31.10%), C (24.14%), G (14.36%), and T (30.40%). Similar to other Syngnathidae species, it contained a typically conserved structure, including 13 protein-coding genes, 2 rRNA genes, 1 control region (D-loop), and 22 tRNA genes. The 13 protein-coding genes encoded 3800 amino acids in total, most of which used the initiation codon ATG except CO1 gene started with GTG. For the stop codon, 6 genes applied TAA as the stop codon, while the other 7 genes used an incomplete stop codon T or TA. The lengths of 12S rRNA and 16S rRNA were 941 bp and 1671 bp, respectively. The control region of D. boaja ranged from 15,615 bp to 16,562 bp, which was 948 bp in length. The complete mitochondrial genome of D. boaja provided essential and important molecular data for phylogeography and evolutionary analysis of Syngnathidae Family.