Phylogenetic trees for primate lice and their vertebrate hosts redrawn from Reed et al. . Trees are shown as cladograms with no branch length information, and are based on molecular and morphological data. Dashed lines between trees represent host-parasite associations. Humans are unique in being parasitized by two genera (Pediculus and Pthirus). Photo credits: J. W. Demastes, T. Choe, and V. Smith.
Reed et al. BMC Biology 2007 5:7 doi:10.1186/1741-7007-5-7