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Abstract
The complete mitochondrial genome of the Zebra bullhead shark Heterodontus zebra was first presented in this study. It was 16,720 bp in length, encoding 37 genes and one control region. The gene order and translate orientation were identical to most vertebrates. Overall nucleotide base composition of H. zebra mitogenome was 31.6% A; 26.8% C; 13.1% G and 28.4% T. Total 27 bp overlaps and 20 bp short intergenic spaces were found in 17 gene junctions in the genome. Two start codons (ATG and GTG) and three terminate codons (TAG, TAA and T) were found in 13 protein-coding genes. Except for tRNA-Ser2, which lost the dihydrouridine (DHU) arm and formed one simple loop, the remaining tRNAs could fold into the typical clover-leaf secondary structures. The termination-associated sequences and three short conserved blocks (CBS I-III) were identified in the control region.