Abstract
In this study, the complete mitogenome of the Smooth lanternshark Etmopterus pusillus (Squaliformes: Etmopteridae) was firstly determined. It was 16,729 bp, consisting of 13 protein-coding genes (PCGs), 22 tRNA genes, 2 rRNA genes and 1 putative control region with typical order to that of most other vertebrates. Its nucleotide base composition is 31.3% A, 23.0% C, 14.3% G and 31.5% T. Two start codons (GTG and ATG) and two stop codons (TAG and TAA/T) were used in the protein-coding genes. The phylogenetic results showed that E. pusillus was clustered to Squaliolus aliae (Dalatiidae) and suggested that Dalatiidae was polyphyletic.