Insects were represented by the house fly "Musca domestica". Crithidia luciliae is a flagellate parasite that uses the housefly, "Musca domestica", as a host. The housefly ("Musca domestica") is a fly of the suborder Cyclorrhapha. This species has been isolated from "Musca domestica" and "Stomoxys calcitrans". Typical are "Dryomyza anilis" and, notably, "Musca domestica". To consume a house fly ("Musca domestica"), even large adult females need almost one hour. The housefly, "Musca domestica", is the best known and most important species. Houseflies ("Musca domestica") have a mutualistic relationship with the bacterium "K. oxytoca".