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Sycamore Seed Bug (Belonochilus numenius)


Detailing the physical features, habits, territorial reach and other identifying qualities of the Sycamore Seed Bug



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Image Credit: Mike R. from Genoa, WV
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Newly introduced to Europe, the Sycamore Seed Bug feeds on the seeds of sycamore trees and has the potential to become a pest in urban areas.



Updated: 08/23/2019; Authored By Staff Writer; Content ©www.InsectIdentification.org
Native to North America, the Sycamore Seed Bug lives and eats on sycamore trees, which are also called plane trees. True to the bug's name, it feeds on the tree's seeds, which limits the spreading of fertile seeds to other areas. How they arrived in Europe is unknown, but they have been noticed in substantial numbers in parks and walkways lined with plane trees. They may become a nuisance over time, creating a need to spray trees. Sycamore Seed Bugs are able to survive cold winters as eggs; in warmer parts of their range, adults can take shelter under the bark of their host tree.

Sycamore Seed Bugs are long and a mottled dark brown. A triangular plate on the back sits near the head. Transparent wing tips are exposed and overlap each other by the end of the abdomen. Adults are active from mid-spring through autumn and 3 to 4 generations can be produced in a single year.




General Characteristics
Capability, Shape, Texture/Pattern, Benefits, Dangers




Taxonomic Hierarchy
Species Breakdown
Kingdom: Animalia
  Phylum: Arthropoda
    Class: Insecta
      Order: Hemiptera
        Family: Lydaeidae
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          Genus: Belonochilus
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            Species: numenius
Identifying Information
Size, Colors, Features
Scientific Name: Belonochilus numenius
Category: True Bug
Size (Adult; Length): 8mm to 10mm (0.31" to 0.39")
Colorwheel Graphic Colors: brown, tan
Relative Size Comparison
Typical Size Between 8mm (0.3in) and 10mm (0.4in)
Lo: 8mm
Md: 9mm
Hi: 10mm
Territorial Map*
U.S., Canada, and Mexico
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Territory map graphic of the country of Mexico
Contiguous United States shape map layer graphic
Alaska  
Hawaii  
Prince Edward Is.  
* MAP NOTES: The territorial heat map above showcases (in red) the states and territories of North America where the Sycamore Seed Bug 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 Sycamore Seed Bug. Insects generally go where they please, typically driven by diet, environmental changes, and / or mating habits.

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