The characteristics and phylogenetic relationship of two complete mitochondrial genomes of Cottus pollux (scorpaeniformes: cottidae).

We report two complete mitochondrial genomes of Cottus pollux based on specimens collected from Deokdong and Hoam Streams in the Republic of Korea. The two complete mitochondrial genomes were 16,558 and 16,557 bp long. Both contain the 37 standard genes (13 protein-coding genes, 22 transfer RNA genes, two ribosomal RNA genes, and one control region) in the same order and have similar nucleotide compositions. According to the phylogenetic tree constructed using the maximum-likelihood method, C. pollux is closely related to C. reinii. The genetic information provided by the complete mitochondrial genome of C. pollux will contribute to an understanding of the phylogenetic position, evolutionary relationships, and biogeographical patterns of this species within the genus Cottus.

The complete mitochondrial genome of Acanthogobius lactipes and its phylogenetic analysis.

Acanthogobius lactipes is a demersal, euryhaline fish belonging to the suborder Gobiodei. This study sequenced and described the complete mitochondrial genome of A. lactipes for the first time. The circular genome of A. lactipes is 16,592 bp in length and contains 13 protein-coding genes, 22 transfer RNA genes, two ribosomal RNA genes, and a control region. The overall A, C, G, and T contents were 27.78, 27.31, 17.52, and 27.39%, respectively. Based on the 13 protein-coding genes, the phylogenetic tree showed that A. lactipes formed a well-supported cluster with the genus Acanthogobius and rooted with other family Oxudercidae species.

The complete mitochondrial genome of Chionoecetes japonicus (Crustacea: Decapoda: Majoidea).

The complete mitochondrial genome of Chionoecetes japonicus was sequenced using a specimen collected offshore in the East Sea. The genome includes 13 protein-coding genes (PCGs), 22 transfer RNA (tRNA) genes, two ribosomal RNA (rRNA) genes, and a control region (D-loop), with a total length of 16,060 bp. The overall nucleotide composition was 34.91% A, 17.29% C, 10.93% G, and 36.87% T, with 71.78% A + T. In the phylogenetic tree was constructed using maximum-likelihood and Bayesian inference analyses, C. japonicus and C. japonicus pacificus formed a genetic clade that was sister to C. opilio.