The complete mitochondrial genome of the fourfinger threadfin Eleutheronema tetradactylum (Perciforms: Polynemidae) and comparison of light strand replication origin within Percoidei.

The complete mitochondrial genome of Eleutheronema tetradactylum was determined, which was the first complete mitochondrial genome in Polynemidae family. The mitochondrial genome was 16,474 base pairs in length, encoding a standard set of 13 protein-coding genes, 2 ribosomal RNA genes, 22 tRNA genes and 2 main non-coding regions (the control region and the origin of the light strand replication). The overall base composition of E. tetradactylum is A 27.2%, C 29.9%, G 17.0% and T 25.9%, with a slight A + T bias of 53.1%. The mitochondrial genome of E. tetradactylum had common features about gene arrangement and tRNA structures compared with those of other vertebrate fishes. Two non-coding regions were also determined within its mitogenome. These mitogenome sequence data would play an important role in population genetics and phylogenetic analysis of the Polynemidae.