common barklouse

(Hyalopsocus striatus)

               
Conservation Status

IUCN Red List

not listed

common barklouse (Hyalopsocus striatus)

NatureServe

not listed

Minnesota

not listed

Occurrence

 

Flight/Season

 

Habitat

Deciduous and mixed woodlands, wood buildings, and wood piles

Size

Total Length: to 516 (3.5 to 8.0 mm)

Photo by Alfredo Colon
 
Identification

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).

 
Similar
Species

 

 
Nymphal Food

 

 
Adult Food

Algae

 
Life Cycle

 

 
Behavior

Adults are attracted to light at night.

 
Distribution Distribution Map  

Sources: 24, 29, 30, 82.

 
Comments

 

 
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

In Odonata and Hymenoptera, the dark, blood-filled second cell at the leading edge of each wing toward the tip. 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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