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Oak Timberworm Weevil (Arrhenodes minutus)

Detailing the physical features, habits, territorial reach and other identifying qualities of the Oak Timberworm Weevil

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The long beak and narrow body of the Oak Timberworm Weevil strays from the more familiar weevil's snout and humpback.

Updated: 01/04/2022; Authored By Staff Writer; Content ©www.InsectIdentification.org
An Oak Timberworm Weevil female lays her fertilized eggs on the injured or scraped parts of an oak tree, then it pushes each egg deeper into the tree's wound. She then covers the eggs with frass, a powdery mix of her own feces and wood shavings. Finding injured spots on the tree saves her the time and effort of having to chew an opening into the bark.

Healthy trees require her to use that long beak to break into the bark to create an opening. Unlike most beetles, the female Oak Timberworm Beetle consistently cleans her antennae of wood debris while she bores into fresh bark. The male guards her while she works. Each newly hatched larva bores deeper into the wood. The larva's tunneling through the wood leaves what look like pin holes in the timber, reducing the wood's usability once it is harvested. These tiny holes can be numerous and unsightly, making the wood a poor choice for flooring, furniture and other products, which lowers the lumber's grade and value.

The majority of this weevil's life is spent inside the tree. Adults tend to remain just under the bark, where they feast on fungi, sap, and other insects living in that layer of the trunk. Look for slender, black Oak Timberworm Weevils under the bark of oak trees or near gashes and cuts on the trunk. They are attracted to lights at night.©InsectIdentification.org

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General Characteristics

Capability, Shape, Texture/Pattern, Benefits, Dangers

Taxonomic Hierarchy

Species Breakdown
Kingdom: Animalia
  Phylum: Arthropoda
    Class: Insecta
      Order: Coleoptera
        Family: Brentidae
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          Genus: Arrhenodes
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            Species: minutus

Identifying Information

Size, Colors, Features
Scientific Name: Arrhenodes minutus
Category: Beetle
Size (Adult; Length): 7mm to 22mm (0.27" to 0.86")
Colorwheel Graphic Colors: black; orange; yellow

Relative Size Comparison

Typical Size Between 7mm (0.3in) and 22mm (0.9in)
Lo: 7mm
Md: 14.5mm
Hi: 22mm

Territorial Map*

U.S., Canada, and Mexico
State of Alabama graphic
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Canadian territory of Alberta graphic
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Canadian territory of Newfoundland and Labrador graphic
Canadian territory of Ontario graphic
Canadian territory of Quebec graphic
Canadian territory of Saskatchewan graphic
Territory map graphic of the country of Mexico
Contiguous United States shape map layer graphic
Prince Edward Is.  
* MAP NOTES: The territorial heat map above showcases (in red) the states and territories of North America where the Oak Timberworm Weevil may be found (but is not limited to). This sort of data is useful when attempting to see concentrations of particular species across the continent as well as revealing possible migratory patterns over a species' given lifespan. Some insects are naturally confined by environment, weather, mating habits, food resources and the like while others see widespread expansion across most, or all, of North America. States/Territories shown above are a general indicator of areas inhabited by the Oak Timberworm Weevil. Insects generally go where they please, typically driven by diet, environmental changes, and / or mating habits.
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