Balloon-like organ in the head of teneral dipterans that pushes off the operculum of the puparium.
(from the article `housefly`) ...eggs in her life. These eggs hatch in 12 to 24 hours. After several molts the dirty-whitish maggots (larvae), about 12 mm long, transform into ...Found on http://www.britannica.com/eb/a-z/p/129
ptilinum A head vesicle or bladder-like expansion of the head of a fly emerging from a pupa. There is a special structure which is used to help an emerging adult fly break free of the puparium. This structure is an inflatable membranous sac called the ptilinum which protrudes from the face, above the antennae. The inflation of the ptilinum (using...Found on http://www.wordinfo.info/words/index/info/view_unit/1783/
The ptilinum is an eversible pouch on the head, above the base of the antenna in schizophoran flies (often called `Cyclorrhapha`). It is used to force off the end of the puparium in order for the fly to emerge, and after this inflation at emergence, the ptilinum collapses back inside the head, marked thereafter only by the ptilinal suture or fro.....Found on http://en.wikipedia.org/wiki/Ptilinum
In Diptera an organ that can be inflated to a bladder-like structure and thrust out through a frontal suture of the head at the time of emergence from the puparium.Found on http://www.earthlife.net/insects/glossary.html
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