sentences:  The blood-parasites of the genus "Plasmodium" and "Haemoproteus", encompass an extremely diverse group of pathogens with global distribution.The large number of parasite lineages along with their wide range of potential host species and the pathogen's capacity for host switching makes the study of this system extremely complex.Evolutionary relationships between hosts and the parasites have only added complexity and suggested extensive sampling is needed to elucidate how global cospeciation events drive disease transmission and maintenance in various ecosystems.