dogwood sawfly

(Macremphytus testaceus)

Conservation Status
dogwood sawfly (Macremphytus testaceus)
Photo by Alfredo Colon
  IUCN Red List

not listed

 
  NatureServe

not listed

 
  Minnesota

not listed

 
       
       
       
 
Description
 
 

Macremphytus testaceus is a large dogwood sawfly. It occurs in the United States and southern Canada from the east coast to the Great Plains. It is most common in the northeast, uncommon in the southeast, and there a just a handful records in the west and in Central and South America.

Adults are wasp-like in appearance but the abdomen is broadly joined to the thorax and they do not sting. Females are to 716 (10.0 to 10.8 mm) in length. Males are smaller, averaging 516 (8.3 mm) in length.

The head is mostly reddish brown with small areas of black. The plate on the front of the face (clypeus) has a deep circular impression for half or more of its length, and a ridge on the front margin. The antennae are long and are compressed laterally. There are nine segments. The first and second segments and the basal half of the third segment are reddish-brown. The second segment is short, as wide or wider than long. The outer (distal) half of the third segment and the fourth and fifth segments are black. The third segment is as long as or slightly longer than the fourth. The last four segments are white.

The thorax is black, sometimes with a few reddish-brown spots. A small plate over each wing base (tegula) and a plate near the rear margin of the thorax (metascutellum) are whitish. The plate in the middle of the front margin of the thorax (mesoscutum) may be whitish or black.

The abdomen is reddish-brown to dark brown.

The legs are reddish-brown to whitish. The third segment (femur) and fourth segment (tibia) are reddish-brown on the basal half, black on the distal half.

The wings are lightly and uniformly tinted brown. On the forewing the anal crossvein is oblique.

 
     
 

Size

 
 

Male: Average 516 (8.3 mm)

Female: to 716 (10.0 to 10.8 mm)

 
     
 

Similar Species

 
 

Dogwood sawfly (Macremphytus tarsatus) is mostly black.

 
     
 
Habitat
 
 

Deciduous and mixed forests, yards with ornamental dogwoods.

 
     
 
Biology
 
 

Season

 
 

One generation per year. May to July.

 
     
 

Behavior

 
 

 

 
     
 

Life Cycle

 
 

Females lay up to 100 or more eggs on the underside of a single dogwood leaf. The eggs hatch in July and feed on the leaf, skeletonizing it. The final instar larva seeks rotted wood, or house siding, to make a cocoon, in which it overwinters. Adults emerge in May and June.

 
     
 

Larva Food

 
 

Leaves of dogwoods

 
     
 

Adult Food

 
 

 

 
     
 
Distribution
 
 

Distribution Map

 

Sources

24, 29, 30.

 
  5/6/2021      
         
 

Occurrence

 
 

 

 
         
 
Taxonomy
 
 

Order

Hymenoptera (ants, bees, wasps, and sawflies)  
 

Suborder

Symphyta (sawflies, horntails, and wood wasps)  
 

Superfamily

Tenthredinoidea (typical sawflies)

 
 

Family

Tenthredinidae (common sawflies)

 
 

Subfamily

Allantinae

 
  Tribe Allantini  
 

Genus

Macremphytus (dogwood sawflies)  
       
 

Synonyms

 
 

 

 
       
 

Common Names

 
 

This species has no common name. The common name for the genus Macremphytus is dogwood sawflies, and is used here for convenience.

 
       

 

 

 

 

 

 

Glossary

Clypeus

On insects, a hardened plate on the face above the upper lip (labrum).

 

Femur

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

 

Tegula

A small, hardened, plate, scale, or flap-like structure that overlaps the base of the forewing of insects in the orders Lepidoptera, Hymenoptera, Diptera, and Homoptera. Plural: tegulae.

 

Tibia

The fourth segment of an insect leg, after the femur and before the tarsus (foot). The fifth segment of a spider leg or palp.

 

 

 

 

 

 
 
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Alfredo Colon

 
    dogwood sawfly (Macremphytus testaceus)   dogwood sawfly (Macremphytus testaceus)  
           
    dogwood sawfly (Macremphytus testaceus)      
           
 
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  Alfredo Colon
8/30/2019

Location: Slinger, Wisconsin

dogwood sawfly (Macremphytus testaceus)

 
  Alfredo Colon
8/15/2019

Location: Woodbury, Minnesota

dogwood sawfly (Macremphytus testaceus)

 
  Alfredo Colon
8/9/2019

Location: Woodbury, Minnesota

dogwood sawfly (Macremphytus testaceus)

 
           
 
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Created: 5/6/2021

Last Updated:

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