Living With House Flies

Left: House fly adult everts ptilinum as it emerges
Right: House fly puparium showing the escape hole

House flies and other Schizophoran flies form their pupae inside the cuticle of the final larval stage. The adult develops inside this hard cuticle and must escape its confines when fully formed. Most insects digest a straight line of cuticle from the back of the head through the thorax. They escape by pushing against the cuticle until it breaks, creating a straight line opening along the…

Source: Living With Insects Blog

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