…is a large species of parasitic mermithid nematode that is native to the nearctic and palearctic ecozones. M.nigrescens usually parasitize grasshoppers and are ingested as eggs. Once an egg enters a grasshopper the outer layers of the egg will rub off and the larvae will move out. Once hatched the larvae will pierce the gut wall and enter the body cavity where they will feed on body fluids. in 3-6 weeks the will emerge from the hosts, crawl into the soil, molt, and mate. Females will spend their winter in the soil and will emerge on rainy or dewy morning in spring/summer to climb up on plants and lay their eggs.