hoverfly

(Platycheirus spp.)

Overview
hoverfly (Platycheirus sp.)
Photo by Alfredo Colon
 
 

Platycheirus is a large species of hoverflies. There are about 220 Platycheirus species worldwide, 75 species in North America north of Mexico, and at least 15 species in Minnesota.

Adults are found in moist woodlands, humid meadows, marshes, fens, and other wetlands, and on lake shores. They feed on the pollen of sedges and other low-growing, wind-pollinated plants. Larvae feed on aphids and decomposing plant material.

     
           
 
Description
 
 

Platycheirus are relatively small, narrow-bodied hoverflies. The face is black. The compound eyes are bare. The exoskeletal plates above the first and second segments of the thorax (scutum and scutellum respectively) are black with no yellow markings. The swelling on each rear corner of the scutum (postpronotum) is bare. On the underside of the thorax, the area in between the middle and hind legs (metasternum) is unmodified, not small and diamond-shaped. The abdomen is usually black with pairs of yellow, orange, or silvery spots on each segment. The wings are longer than the abdomen. The vein on the leading edge of the wing (costa) ends at or slightly beyond the wing tip.

Identification to the species level requires close examination of the front leg and sometimes the middle leg of the male. Females of some species cannot be identified from a photograph.

 
     
 
Distribution
 
 

Distribution Map

 

Sources

24, 27, 29, 30, 72, 82.

Telford, Horace S.. (1939). The syrphidae of Minnesota. University of Minnesota. Minnesota Agricultural Experiment Station.

Skevington, J. H., Locke, M. M., Moran, K., Marshall, S. A., Crins, W. J., Young, A. D. (2019). Field Guide to the Flower Flies of Northeastern North America. United States: Princeton University Press.

 
  1/13/2021    
         
 
Taxonomy
 
 

Order

Diptera (gnats, mosquitoes, true flies)  
 

Suborder

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

Infraorder

Muscomorpha  
  Section Aschiza  
 

Superfamily

Syrphoidea  
 

Family

Syrphidae (hover flies)  
 

Subfamily

Syrphinae  
 

Tribe

Bacchini  
       
 

Subordinate Taxa

 
 

blackspine sedgesitter (Platycheirus scambus)

cobalt sedgesitter (Platycheirus pictipes)

comb-legged sedgesitter (Platycheirus immarginatus)

confusing sedgesitter (Platycheirus confusus)

coppery sedgesitter (Platycheirus luteipennis)

delicate sedgesitter (Platycheirus angustatus)

eastern forest sedgesitter (Platycheirus obscurus)

fourspot sedgesitter (Platycheirus rosarum)

hornhand sedgesitter (Platycheirus granditarsis)

many-tufted sedgesitter (Platycheirus scutatus)

meadow sedgesitter (Platycheirus quadratus)

nearctic broadhand sedgesitter (Platycheirus nearcticus)

pearly sedgesitter (Platycheirus hyperboreus)

silver sedgesitter (Platycheirus varipes)

smoky-winged sedgesitter (Platycheirus clypeatus)

Thompson’s sedgesitter (Platycheirus thompsoni)

twospear sedgesitter (Platycheirus nodosus)

yellow sedgesitter (Platycheirus modestus)

yellowspine sedgesitter (Platycheirus scamboides)

 
       
 

Synonyms

 
 

 

 
       
 

Common Names

 
 

This genus has no common name. All of the named species are called “sedgesitters”. However, I could find no source that referred to the genus itself by that common name. The common name for the family Syrphidae is hover flies, and is used here for convenience.

 
       

 

 

 

 

 

Glossary

Costa

On ferns: The central axis of a pinna, to which pinnules are attached. On mosses: the central axis (midvein) of a leaf. On insects: The vein on the leading edge of the forewing.

 

Scutellum

The exoskeletal plate covering the rearward (posterior) part of the middle segment of the thorax in some insects. In Coleoptera, Hemiptera, and Homoptera, the dorsal, often triangular plate behind the pronotum and between the bases of the front wings. In Diptera, the exoskeletal plate between the abdomen and the thorax.

 

Scutum

The forward (anterior) portion of the middle segment of the thorax (mesonotum) in insects and some arachnids.

 

 

 

 

 

       
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Alfredo Colon
       
  hoverfly (Platycheirus sp.)    
       
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  Platycheirus
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  Platycheirus  
 
About

Family: Syrphidae
Subfamily: Syrphinae
Tribe: Bacchini

- Platycheirus (syrphid fly)
- Platycheirus quadratus (syrphid fly)

 
     

 

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Alfredo Colon
8/13/2019

Location: Woodbury, MN

hoverfly (Platycheirus sp.)


     
     
 
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Created: 1/13/2021

Last Updated:

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