sentences:  Pomphorhynchus laevis
  
  Pomphorhynchus laevis is an endo-parasitic acanthocephalan worm, with a very complex life cycle, that can modify the behavior of its intermediate host, the freshwater amphipod "Gammarus pulex".This species does not contain a digestive tract and relies on the nutrients provided by its host species leading to the accumulation of lead in "P. laevis" from the bile of the host species.