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Cribellate Orb Weaver (Uloborus spp.)


Detailing the physical features, habits, territorial reach and other identifying qualities of the Cribellate Orb Weaver


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The tropical Cribellate Orb Weaver spins a very fine silk web that uses design, not substance, to tangle its prey.



Updated: 01/26/2021; Authored By Staff Writer; Content ©www.InsectIdentification.org
The legs of the Cribellate Orb Weaver have flared, feathery tufts of hair at the 'ankles'. The front pairs of legs are extremely long. Oftentimes these front legs are stretched out in front of the spider, grouped next to each other. This position elongates the spider while it sits on its web. Two bumps at the top of the abdomen help disguise the brown and white speckled abdomen.

Webs are built flat and parallel to the ground, at or around knee-height. The spider sits on it, or near it, in its tucked position. Sometimes it lies in wait on the underside of the web, giving it the appearance of a dead flower or piece of leaf. The Cribellate Orb Weaver creates a web that lacks sticky silk. The web itself has tiny gaps between the strands that easily catch the legs of insects landing on it. Small prey are easily tangled, rendering sticky silk unnecessary. The cribellum on the legs allow the spider to 'comb' its web, keeping the fine strands separated until prey enters.

This tiny spider is found in humid, tropical climates and is one of the few spiders that lack venom. Instead of chemically immobilizing their prey, Cribellate Orb Weavers kill their victims by winding them tightly in silk, squeezing them to death.©InsectIdentification.org


Note: The above text is EXCLUSIVE to the site www.InsectIdentification.org. It is the product of hours of research and work made possible with the help of contributors, educators, and topic specialists. If you happen upon this text anywhere else on the internet or in print, please let us know at InsectIdentification AT gmail DOT com so that we may take appropriate action against the offender / offending site and continue to protect this original work.


General Characteristics


Capability, Shape, Texture/Pattern, Benefits, Dangers


Taxonomic Hierarchy


Species Breakdown
Kingdom: Animalia
  Phylum: Arthropoda
    Class: Arachnida
      Order: Araneae
        Family: Uloboridae
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          Genus: Uloborus
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            Species: spp.

Identifying Information


Size, Colors, Features
Scientific Name: Uloborus spp.
Other Name(s): Feather-legged Orb Weaver
Category: Spider
Size (Adult; Length): 3mm to 7mm (0.11" to 0.27")
Colorwheel Graphic Colors: brown; tan; white
Descriptors: long, tucked, silk


Relative Size Comparison


Typical Size Between 3mm (0.1in) and 7mm (0.3in)
Lo: 3mm
Md: 5mm
Hi: 7mm

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 Cribellate Orb Weaver 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 Cribellate Orb Weaver. Insects generally go where they please, typically driven by diet, environmental changes, and / or mating habits.
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