Linnaeus (1758) described the species on the basis of specimens taken from a donkey (or ass), Equus asinus, without designation of type, and P. macrocephalus was based on specimens from horse in Europe. [ex. Kim, K. C., Pratt, H. D., Stojanovich, C. J. 1986. The Sucking Lice of North America, p. 241: Pennsylvania State University]
Systema Naturae, Edition X
Taxon Citation Remarks:
Citation information points to the most recent interpretation of the taxon name (not the original, which is absent from the sucking louse checklist).