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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.


 Updated: 2/26/2018; Authored By Staff Writer; Content ¬©www.InsectIdentification.org



  Cribellate Orb Weaver  
Picture of Cribellate-Orb-Weaver


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





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 get 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 only spiders that lacks venom. Instead of chemically immobilizing their prey, Cribellate Orb Weavers kill their victims by winding them tightly in silk, squeezing them to death.
Basic Information
Common Name: Cribellate Orb Weaver
Other Name(s): Feather-legged Orb Weaver
Scientific Name: Uloborus spp.
Category: Spider


General Identification
Size (Adult; Length): 3mm to 7mm (0.12in to 0.27in)
Colorwheel Graphic
Identifying Colors: brown; tan; white
Additional Descriptors: long, tucked, silk




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


Spider Anatomy (Typical)
Graphic showing basic parts of spider anatomy
1
Legs: Spiders have four pairs of legs and these are attached to the cephalothorax.
2
Pedipalps: Small appendages near the mouth used as taste and smell organs.
3
Cephalothorax: Contains eyes, head, mouthparts, and legs.
4
Abdomen: Contains various organs related to digestion, reproduction, and web-making.
5
Spinnerets: Used in the production of spider silk for fashioning webs or catching prey.
NOTE: Unlike insects, spiders have both an endoskeleton (internal) and exoskeleton (external).


Territorial Reach (A-to-Z)
Note: An insect's reach is not limited by lines drawn on a map and therefore species may appear in areas, regions and/or states beyond those listed below as they are driven by environmental factors (such as climate change), available food supplies and mating patterns. Grayed-out selections below indicate that the subject in question has not been reported in that particular territory. U.S. states and Canadian provinces / territories are clickable to their respective bug listings.
Alabama
Alaska
Arizona
Arkansas
California
Colorado
Connecticut
Delware
Florida
Georgia
Hawaii
Idaho
Illinois
Indiana
Iowa
Kansas
Kentucky
Louisiana
Maine
Maryland
Massachusetts
Michigan
Minnesota
Mississippi
Missouri
Montana
Nebraska
Nevada
New Hampshire
New Jersey
New Mexico
New York
North Carolina
North Dakota
Ohio
Oklahoma
Oregon
Pennsylvania
Rhode Island
South Carolina
South Dakota
Tennessee
Texas
Utah
Vermont
Virginia
Washington
West Virginia
Wisconsin
Wyoming
Canadian National Flag Graphic
Alberta
British Columbia
Manitoba
New Brunswick
Newfoundland and Labrador
Nova Scotia
Ontario
Prince Edward Island
Quebec
Saskatchewan
Mexican National Flag Graphic
Mexico


Territorial Area Map (Visual Reference Guide)
The map below 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 can be useful in seeing concentrations of a particular species over the continent as well as revealing possible migratory patterns over a species' given lifespan. Some species 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.
Alaska  
Hawaii  
Prince Edward Is.  
State of Alabama graphic
State of Arizona graphic
State of Arkansas graphic
State of California graphic
State of Colorado graphic
State of Delware graphic
State of Florida graphic
State of Georgia graphic
State of Idaho graphic
State of Illinois graphic
State of Indiana graphic
State of Iowa graphic
State of Kansas graphic
State of Kentucky graphic
State of Louisiana graphic
State of Maine graphic
State of Maryland graphic
State of Michigan graphic
State of Minnesota graphic
State of Mississippi graphic
State of Missouri graphic
State of Montana graphic
State of Nebraska graphic
State of Nevada graphic
State of New England graphic
State of New Jersey graphic
State of New Mexico graphic
State of New York graphic
State of North Carolina graphic
State of North Dakota graphic
State of Ohio graphic
State of Oklahoma graphic
State of Oregon graphic
State of Pennsylvania graphic
State of South Carolina graphic
State of South Dakota graphic
State of Tennessee graphic
State of Texas graphic
State of Utah graphic
State of Virginia graphic
State of Washington graphic
State of West Virginia graphic
State of Wisconsin graphic
State of Wyoming graphic
Canadian territory of Alberta graphic
Canadian territory of British Columbia graphic
Canadian territory of Manitoba graphic
Canadian territory of New Brunswick graphic
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


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