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House Spider (Metaltella simoni)

Detailing the physical features, habits, territorial reach and other identifying qualities of the House Spider

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One of many types of House Spiders, Metaltella simoni actually came a long way to make itself at home in yours.

Updated: 01/04/2022; Authored By Staff Writer; Content ©www.InsectIdentification.org
The dark brown House spider, M. simoni is native to the eastern South American countries of Argentina, Brazil and Uruguay. It arrived in North America in the 1900's via trade routes between the two continents. It has established a stable presence in the warm, humid states along the Gulf of Mexico as well as parts of California. M. simoni appears to be outcompeting native spiders, like T. brunnea, for resources, which is cause for concern in those regions.

This House Spider is not known to be harmful to humans. Its gangly legs and dark body make it easy to spot on light-colored ceilings and walls. It is also comfortable living outdoors and can be found on trees, on the ground and under rocks and leaf litter. Its web is a fluffy mess of spider silk that has been combed out to maximize its efficacy. Females lay fertilized eggs in a sac of bumpy silk and hide it using dirt, debris or other nearby material.

This spider is commonly mistaken for a Brown Recluse (even though it clearly lacks the tell-tale dark 'violin-shaped' mark on its head) as well as the non-aggressive Hacklemesh Weaver spider.©InsectIdentification.org

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General Characteristics

Capability, Shape, Texture/Pattern, Benefits, Dangers
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Taxonomic Hierarchy

Species Breakdown
Kingdom: Animalia
  Phylum: Arthropoda
    Class: Arachnida
      Order: Araneae
        Family: Amphinectidae
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          Genus: Metaltella
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            Species: simoni

Identifying Information

Size, Colors, Features
Scientific Name: Metaltella simoni
Category: Spider
Size (Adult; Length): 6mm to 10mm (0.23" to 0.39")
Colorwheel Graphic Colors: brown; black
Descriptors: shiny; glossy; scrawny

Relative Size Comparison

Typical Size Between 6mm (0.2in) and 10mm (0.4in)
Lo: 6mm
Md: 8mm
Hi: 10mm

Territorial Map*

U.S., Canada, and Mexico
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Prince Edward Is.  
* MAP NOTES: The territorial heat map above showcases (in red) the states and territories of North America where the House Spider 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 House Spider. Insects generally go where they please, typically driven by diet, environmental changes, and / or mating habits.
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