Description
The life history of the house fly (Musca domestica) follows complete metamorphosis, passing through four distinct stages: egg, larva (maggot), pupa, and adult.
Stages of House Fly Life Cycle
Egg: Female house flies lay up to 500 tiny white eggs in several batches of 75–150, usually on decaying organic matter, manure, garbage, or food waste. Eggs hatch in 8–24 hours, depending on temperature and moisture, yielding larvae.
Larva (Maggot): The larvae, or maggots, are legless, whitish, and tapered at the head, feeding voraciously on the decaying material where they hatched. This stage lasts 3–5 days under ideal conditions, with several molts as the maggots grow.
Pupa: At maturity, maggots seek dry, cool places, transforming into reddish-brown, barrel-shaped pupae using their last larval skin as a protective case. Pupal development lasts 2–6 days at high temperatures or up to 20 days if cool.
Adult: The adult house fly emerges from the pupa, using a special pouch on the head (ptilinum) to break open the case. Adults are ready to reproduce within 1 day, and the entire cycle can complete in 7–10 days in warm conditions. Adults do not grow after emerging; size reflects larval nutrition.
Additional Details
This cycle can repeat for 10–20 generations per year, depending on climate, leading to rapid population spikes.
House flies do not provide parental care; eggs and larvae are left to develop independently.
The short, efficient life cycle and high reproductive output make house flies common and persistent pests, especially where food waste or animal manure is available.
Understanding the life stages of the house fly is essential for effective pest control and for biological study of rapid insect development.