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Running Spider (Trachelas sp.)


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

 Updated: 3/4/2019; Authored By Staff Writer; Content ¬©www.InsectIdentification.org




Running Spiders are always on the hunt and use their silk only to build a small shelter for the occasional break and mealtime.



Running Spiders, or sac spiders, do not form webs. Instead they hunt their prey with lightning-quick speed. They are fast and stealthy, ambushing insects that are either unaware of their presence or unable to flee fast enough.

The dark reddish head and thorax are in stark contrast to the tan abdomen. Hind legs are the palest color of the eight, appearing almost white. The pedipalps in front of the face are feelers and are large enough to be mistaken for a fifth pair of legs.

All spiders (except Cribellate Orbweavers) have venom and use it to immobilize or kill prey. This particular genus of spider is said to have a pretty painful bite to humans, but its venom is not dangerous like a Black Widow or Brown Recluse's. That said, a few reports of an infection arising at the bite site (possibly from scratching or touching it) have been made, as well as a lengthy healing time for a wound to heal. As every body is different, see a medical professional if you think a spider bite is getting worse or more painful.
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Taxonomic Hierarchy
Kingdom: Animalia
  Phylum: Arthropoda
    Class: Arachnida
      Order: Araneae
        Family: Corrinidae
          Genus: Trachelas
            Species: sp.
Identifying Information
Scientific Name: Trachelas sp.
Category: Spider
Size (Adult; Length): 3mm to 10mm (0.12in to 0.39in)
Colorwheel Graphic Colors: red; brown; white; tan
Descriptors: biting, venomous, fast
Territorial Map
Alaska  
Hawaii  
Prince Edward Is.  
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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
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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).