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Sac Spider (Trachelas spp.)


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

 Updated: 2/3/2014; Authored By Staff Writer; Content ¬©www.InsectIdentification.org




Sac Spiders should be a good incentive to keep up with the laundry. They like to hide in the clothes and will bite their way out if they have to.



When it comes to catching prey, Sac Spiders are predatory hunters, not web weavers. They use their spider silk to weave tent-like sacs between leaves or on tree trunks for retreats though. Sac Spiders are fast runners. They may appear tan, yellowish or even slightly greenish. Only 8 native species inhabit North America.

The group of various Sac Spiders are known to deliver painful bites to humans. These spiders are not outright aggressive, but if threatened, they bite defensively. Because they are wanderers, they sometimes rest in a pile of clothes (clean or dirty) that have been left on the floor. When someone moves it, or puts on something from the pile, the Sac Spider may get trapped between the clothing and the person's skin and bite him/her to escape.

Like all spiders (except Cribellate Orbweavers), they produce a venom designed to immobilize their insect prey. While their venom is not seriously dangerous like a Brown Recluse's or Black Widow's, Sac Spider bites are slow to heal. It is not uncommon for the bite area to get infected as victims frequently scratch or touch it.




Taxonomic Hierarchy
Kingdom: Animalia
  Phylum: Arthropoda
    Class: Arachnida
      Order: Araneae
        Family: Corinnidae
          Genus: Trachelas
            Species: spp.
Identifying Information
Scientific Name: Trachelas spp.
Category: Spider
Size (Adult; Length): 5mm to 8mm (0.20in to 0.31in)
Colorwheel Graphic Colors: red; brown; tan; green; yellow
Descriptors: biting, venomous
Territorial Map
Alaska  
Hawaii  
Prince Edward Is.  
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State of Delware graphic
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Territory map graphic of the country of Mexico
Contiguous United States shape map layer graphic


Territorial Reach (A-to-Z)
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
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 above as they are driven by environmental factors (such as climate change), available food supplies and mating patterns. Grayed-out selections 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.




Spider Anatomy
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).