marsh fly

(Dictya spp.)

Overview
marsh fly (Dictya sp.)
Photo by Alfredo Colon
 
  Dictya is a genus of marsh flies. It occurs in Scandinavia, the United Kingdom, North America, and Central America. There are at least 44 species of Dictya worldwide, 27 species in North America north of Mexico, and at least 4 species in Minnesota. They are common in late summer and fall in Minnesota, at least at Cedar Creek Ecosystem Science Reserve in Anoka County. Adults are found in marshy areas near ponds and streams and in moist woodlands. Larvae are aquatic and feed on snails, snail eggs, and slugs.      
           
 
Description
 
 

Dictya are small to medium-sized flies, 3 16 to ½ (5 to 8 mm) long. The face is white with a small black spot in the middle. The antennae are distinctly projected forward. The body is usually yellowish-brown. The plate on the underside of the first thoracic segment (prosternum) is bare, not hairy. The wings are dark with numerous white spots, including two spots near the tip if the subcostal (Sc) cell. The legs are somewhat elongated but not especially long. On the male the third segment (femur) of the middle leg has a row of short, stout bristles on the underside of the lower (distal) half (posteroventral).

Identification beyond the genus level cannot be reliably made from photographs alone. For the species, identification requires microscopic examination of the genitalia.

 
     
 
Distribution
 
 

Distribution Map

 

Sources

24, 27, 29, 30, 82.

 
  12/26/2020      
         
 
Taxonomy
 
 

Order

Diptera (gnats, mosquitoes, true flies)  
 

Suborder

Brachycera (circular-seamed flies, mouches muscoïdes, muscoid flies, short-horned flies)  
 

Infraorder

Muscomorpha  
  No Rank Eremoneura  
  No Rank Cyclorrhapha  
  Section Schizophora (muscoid flies)  
  Subsection Acalyptratae (acalyptrates)  
 

Superfamily

Sciomyzoidea  
 

Family

Sciomyzidae (marsh flies)  
 

Subfamily

Sciomyzinae  
 

Tribe

Tetanocerini  
       
 

Subordinate Taxa

 
 

marsh fly (Dictya atlantica)

marsh fly (Dictya borealis)

marsh fly (Dictya disjuncta)

marsh fly (Dictya expansa)

marsh fly (Dictya pictipes)

marsh fly (Dictya sabroskyi)

marsh fly (Dictya stricta)

marsh fly (Dictya umbroides)

 
       
 

Synonyms

 
 

 

 
       
 

Common Names

 
 

This genus has no common name. The common name for the family Sciomyzidae is marsh flies, and is applied here for convenience.

 
       

 

 

 

 

 

Glossary

Femur

On insects and arachnids, the third, largest, most robust segment of the leg, coming immediately before the tibia. On humans, the thigh bone.

 

 

 

 

 

       
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Alfredo Colon
       
  marsh fly (Dictya sp.)   marsh fly (Dictya sp.)
       
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Alfredo Colon
8/8/2019

Location: Woodbury, MN

marsh fly (Dictya sp.)


     
     
 
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Created: 12/26/2020

Last Updated:

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