common barklouse

(Hyalopsocus striatus)

Conservation Status
common barklouse (Hyalopsocus striatus)
Photo by Alfredo Colon
  IUCN Red List

not listed

     
  NatureServe

not listed

     
  Minnesota

not listed

     
           
           
           
           
 
Description
 
 

There are just two North American species of Hyalopsocus. Only one, Hyalopsocus striatus, has been recorded in Minnesota.

Hyalopsocus striatus is a small insect but a medium to large sized common barklouse. It occurs mostly in the northeastern United States and southeastern Canada. There are spotty records in the western United States, and only a few records in Minnesota. It is probably underreported, being overlooked due to its small size, and being difficult to distinguish from many similar species for the same reason. It is found on the trunks and branches of both hardwood trees and pine trees, on the shady sides of wood buildings, and on shaded wood piles.

Adults are to 516 (3.5 to 8.0 mm). The body is soft and bulbous.

The head is relative large for the body. The forehead is swollen. The mouth parts are optimized for chewing. There are nine rod-shaped sensory receptors near the end of the upper lip (labrum).

There are four membranous wings, two large forewings and two small hindwings. Both males and females have long, well developed forewings. On the forewing the basal one-third or two-thirds of the pterostigma is clear, the narrow posterior margin is clear, and the remainder is brown. There is a well-defined or diffuse spot bordering the branching of the first cubitus vein (M-Cu1), mostly after the branching point. The basal half of cell 1a is brown. Cell Cu2 is brown before the nodulus. There is a diffuse brown spot around the junction of the radial sector and the media veins (Rs-M).

 
     
 

Size

 
 

Total Length: to 516 (3.5 to 8.0 mm)

 
     
 

Similar Species

 
     
     
 
Habitat
 
 

Deciduous and mixed woodlands, wood buildings, and wood piles

 
     
 
Biology
 
 

Season

 
 

 

 
     
 

Behavior

 
 

Adults are attracted to light at night.

 
     
 

Life Cycle

 
 

 

 
     
 

Larval Food

 
 

 

 
     
 

Adult Food

 
 

Algae

 
     
 
Distribution
 
 

Distribution Map

 

Sources

24, 29, 30, 82.

 
  11/14/2020      
         
 

Occurrence

 
 

 

 
         
 
Taxonomy
 
 

Order

Psocodea (barklice, booklice, and parasitic lice)  
 

Suborder

Psocomorpha  
 

Superfamily

Psocetae  
 

Family

Psocidae (common barklice)  
 

Subfamily

Psocinae  
 

Tribe

Psocini  
 

Genus

Hyalopsocus  
       
 

Synonyms

 
 

 

 
       
 

Common Names

 
 

No species in this genus has a common name, nor does the genus itself. The common name for the family Psocidae is common barklice, and is applied here for convenience.

 
       

 

 

 

 

 

 

Glossary

Labrum

The upper part of the mouth, sometimes considered the lower part of the face, corresponding to the upper lip, on an insect or crustacean.

 

Nodus

On a dragonfly, the small notch on the lead edge of each wing about halfway between the body and the tip.

 

Pterostigma

The dark, blood-filled second cell at the leading edge of each wing toward the tip on many insects. It is heaver than adjacent, similar sized areas and is thought to dampen wing vibrations and signal mates. (= stigma. More precise than stigma but less often used, even by entomologists.)

 

 

 

 

 

       
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Alfredo Colon
       
  common barklouse (Hyalopsocus striatus)    
       
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Alfredo Colon
September 2019

Location: Woodbury, Minnesota

common barklouse (Hyalopsocus striatus)


     
     
 
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Created: 11/14/2020

Last Updated:

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