Could not find any links for specified country. Please check back later. Xylem is the world leader in tough, portable and reliable pumps for multiple applications. Our broad product range in combined with extensive application experience ensure the right solution that meets your specific needs. Submersible pumps can handle small drainage jobs to larger dewatering projects.
An obligate parasite, or holoparasite, is a parasitic organism that cannot complete its life-cycle without exploiting a suitable host. If an obligate parasite cannot obtain a host it will fail to reproduce.
Head louse. The head louse (Pediculus humanus capitis) is an obligate ectoparasite of humans that causes head lice infestation (pediculosis capitis). Head lice are wingless insects spending their entire lives on the human scalp and feeding exclusively on human blood. Humans are the only known hosts of this specific parasite, while chimpanzees host a closely related species, Pediculus schaeffi.