Explain the Musca of arthropoda which belongs to non chordate phyla?

The Musca is also known as house fly. They occur in untidy places and the areas occupied by the humans. They are saprophagous in their diet that means they depend on liquid diet. But if the diet is solid they use their saliva to dissolve the food. The food rises due to the suction force which occurs by pharynx. They are diurnal and almost non functional during night. They have the sponging type of mouth parts. They suck the liquid food and have no mandibles. The hind wings are used to balance the body. They are very dangerous insects and cause the transmission of various infections.