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Gnats in Jack-in-the-pulpit

Gnats in Jack-in-the-pulpit
Pennypack Conservancy Trust, Montgomery County, Pennsylvania, USA
May 4, 2005
Size: 2-3 mm
Jack-in-the-pulpit flowers have a fungus-like smell that attracts many tiny insects, particularly fungus gnats. The male flowers have an escape route, a little slit at the bottom of the spathe; so they leave, loaded with pollen and can repeat their mistake, falling into another flower. If they fall into a female flower, they are out of luck; they accomplish pollination and pay for the favor with their lives. Members of approximately 20 families of insects visit these flowers, including fungus gnats and dark-winged fungus gnats. I guess that mine is one of these and would appreciate some help in narrowing it down if possible. Another visitor is a species of thrips (Heterothrips arisaemae), which is now suspected of being the main pollinator as well as main herbivore of this plant. See International Symposium on Thysanoptera or the html version Symposium on Thysanoptera. Also Deceitful Jack-in-the-pulpit. Another view of this flower and bugs in
I invite those with better equipment (and younger eyes) than mine to take photos of this interesting fauna, they would make a nice addition to the guide.

Higher resolution image

Tribe Exechiini
From what I can see: There is no sagittal furrow on the head and wing venation as well as habitus points to Exechiini. Such short CuA fork (posterior wing veins) is typical for Exechia, which is a known visitor of Arisaema. Anyway, without specimen by hand I can not make a certain ID.

so long,

Family Mycetophilidae
Hello Beatriz,
Your gnat belongs to the family of Mycetophilidae (Fungus gnats), but Iám afraid that is as far my knowledge goes on this one!
Gerard Pennards

That is what I thought. The resolution isn't too good, so I can't ask for more; that is why I hope that somebody else come up with better pictures.

By the way...
By the way, this only applies to the gnat in the lower part of the picture, the parts that are visible in the upper side are definitely from another family, Chironomidae!
Gerard Pennards

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