page_title: Ptilinum
hierarchical_section_title: Ptilinum
caption_attribution_description: English: Adult Eurosta solidaginis emerging from goldenrod gall. Ptilinum on head. Horsham, Montgomery County, Pennsylvania, USA. https://bugguide.net/node/view/268433
context_page_description: The ptilinum is an eversible pouch on the head, above the base of the antenna in schizophoran flies. 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 frontal suture.
context_section_description: The ptilinum is an eversible pouch on the head, above the base of the antenna in schizophoran flies (a section of muscomorphan and cyclorrhaphan flies). 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 frontal suture (which defines the aperture through which it everts).
caption: Eurosta solidaginis emerging from goldenrod gall. Notice the ptilinum used to make a hole
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