Mitochondrial genome of the horse louse, Haematopinus asini . The name, transcription orientation and length (bp) of each gene are indicated. Non-coding regions are in black. Abbreviations of gene names are: cox1–3 for cytochrome c oxidase subunits 1–3; cob for cytochrome b; nad1–5 and nad4L for NADH dehydrogenase subunits 1–5 and 4 L; and rrnS and rrnL for small and large ribosome RNA subunits. tRNA genes are labeled with the single-letter abbreviations of their corresponding amino acids. Numbers indicate the length of each corresponding gene. Minichromosomes shown with asterisk symbols (*) have different gene content and gene arrangement compared with the pig lice, Haematopinus suis and Haematopinus apri.