English: A likely scenario of cospeciation between hominies and their lice. The phylogeny of Hominine species (humans and close relatives) in grey and that of their blood-sicking lice (Pediculidae) in red. Co-speciation results in similar topologies except for two evolutionary events. First, gorilla lice switched to humans to found the species Crab louse. Second, the human louse Pediculus humanus duplicated into two forms, the head louse and body louse. (Based on Reed et al. 2007. Pair of lice lost or parasites regained... 5: 7.)