The complete mitochondrial genome of Gymnogobius Petschiliensis (Gobiiformes; Gobiidae; Gobionellinae) and its phylogenetic implications

Abstract

Of the goby fishes, many Gymnogobius species have been poor recognized mainly because of the absence of enough molecular information and clear phylogenetic framework. In this study, the complete mitochondrial genome of Gymnogobius petschiliensis was determined and described. The mitogenome is 16,422 bp in length and consists of 22 tRNAs, 13 protein-coding genes, two rRNAs, one control region and a light strand replication origin (OL). The arrangement of this mitogenome is identical to that of the typical teleost. The overall base composition is 27.5%, 29.5%, 26.1%, and 16.9%, for A, T, C, and G, respectively, with a slight bias on A + T content (57.0%). The 13 protein-coding genes use the initiation codon ATG except COI, which uses GTG. Most of them use TAA or TAG as the stop codon, while COII, COIII, and Cyt b use an incomplete T or TA and ND4 uses an unusual AGA. The maximum-likelihood phylogeny tree of 19 Gobionellinae species demonstrated that G. petschiliensis had a very closely relationship with the same genus G. urotaenia. This study is expected to contributing to the phylogenetic evolution of G. petschiliensis and further phylogenetic relationship of Gobionellinae and Gobiiformes.