Relationship of Wolbachia strains from lice to each other and to Wolbachia strains from other insects and filarial worms. Parsimony cladogram showing the relationship of Wolbachia strains detected in lice (bold) and their nearest known relatives based on the wsp gene and constructed with branch-and-bound. From right to left, the Wolbachia group is noted, where known, followed by the name of the host and the designation for the individual Wolbachia strain; after the bar the Wolbachia supergroup is indicated. Phlebotomus papatasi is a sand fly (Diptera), Orius strigicollis is a bug (Hemiptera), Tribolium confusum is a beetle (Coleoptera), Tunga penetrans is a flea (Siphonaptera), and Brugia malayi and Onchocerca ochengi are filarial nematodes.