Flat-footed flies

(Agathomyia spp.)

flat-footed fly (Agathomyia sp.)
Photo by Alfredo Colon

Overview

Agathomyia is the largest genus of flat-footed flies (family Platypezidae). There are at least 61 Agathomyia species worldwide, at least 8 species in the United States. There are no previous records of this genus Minnesota.

Agathomyia occur in Europe, Australia, Canada, and northern United States. Larvae develop in fungi. Adults are rarely seen but can be found in forests in late summer and fall.

Description

Agathomyia are small, slender, uncommon flies. Adults are just 116 to 3 16 (2 to 4.8 mm) long. The last part of the leg (tarsus), corresponding to the foot, is dilated. On the wings, the anal cell is longer than the second basal cell and is pointed at the end.

Distribution

Distribution Map

 

Sources

24, 27, 29, 30, 82, 83.

10/27/2025    

Taxonomy

Order

Diptera (flies)

Suborder

Brachycera

Infraorder

Cyclorrhapha

Zoosection

Aschiza

Superfamily

Platypezoidea

Family

Platypezidae (flat-footed flies)

Subfamily

Callomyiinae

Subordinate Taxa

flat-footed fly (Agathomyia aestiva)

flat-footed fly (Agathomyia divergens)

flat-footed fly (Agathomyia fenderi)

flat-footed fly (Agathomyia fulva)

flat-footed fly (Agathomyia lutea)

flat-footed fly (Agathomyia notata)

flat-footed fly (Agathomyia pulchella)

flat-footed fly (Agathomyia talpula)

yellow flat-footed fly (Agathomyia wankowiczii) (Canada)

Synonyms

 

Common Names

This genus has no common name. The common name for the family Platypezidae is flat-footed flies, and it is applied here for convenience.

 

 

 

 

 

 

Glossary

Tarsus

On insects, the last two to five subdivisions of the leg, attached to the tibia; the foot. On spiders, the last segment of the leg. Plural: tarsi.

 

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Alfredo Colon

flat-footed fly (Agathomyia sp.)

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Other Videos

Eggs laid in fungus create disgusting bumps and holes TRYPOPHOBIA
The Foragers

About

Mar 15, 2018

When we found this mushroom we had no idea why it was covered with these tiny disgusting holes and bumps. Later we found out this is a gall created by eggs laid by Agathomyia wankowiczii, the yellow flat-footed fly. The fly is the only insect which creates a gall on fungus, and only ever on one species of fungus, Ganoderma applanatumThe grubs hatch and fall to the ground out of the little holes. Also it looks horrifying.

 

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Alfredo Colon
8/13/2019

flat-footed fly (Agathomyia sp.)

Location: Woodbury, MN

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