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Young house flies (Musca domestica) fill an inflatable structure- the ptilinum- with hemolymph to break free from the hard shell of the puparium. Once free, the ptilinum collapses back into the head.

Urbana, Illinois, USA

Young house flies (Musca domestica) fill an inflatable structure- the ptilinum- with hemolymph to break free from the hard shell of the puparium. Once free, the ptilinum collapses back into the head. Urbana, Illinois, USA

ptilinummetamorphosisdipterabiologyinsects