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Running Spider (Trachelas sp.)

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

 Updated: 1/30/2014; Authored By Staff Writer; Content ¬©

  Running Spider  
Picture of Running-Spider
Picture of Running-Spider Picture of Running-Spider

Running Spiders almost never rest. They are always on the hunt and use their silk 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.

The dark reddish head and thorax are in contrast from the tan abdomen. Hind legs are the lightest of the eight, appearing almost white. Their pedipalps are feelers in the front of the face and are large enough to be mistaken for a 5th pair of legs, albeit shorter ones.

All spiders (except Cribellate Orbweavers) have venom used to immobilize or kill their prey. This particular genus of spider is said to have a pretty painful bite to humans, though their 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. As every body is different, see a medical professional if you think a spider bite is getting worse or more painful.

Picture of the Running Spider
Picture of the Running Spider

Running Spider Information

Category: Spider
Common Name: Running Spider
Scientific Name: Trachelas sp.

Taxonomy Hierarchy

 Arrow graphic Kingdom: Animalia
  Arrow graphic Phylum: Arthropoda
   Arrow graphic Class: Arachnida
    Arrow graphic Order: Araneae
     Arrow graphic Family: Corrinidae
      Arrow graphic Genus: Trachelas
       Arrow graphic Species: sp.

Size, Identifying Tags and Territorial Reach

Size (Adult, Length): Size (Adult, Length): 3 mm to 10 mm (0.117 inches to 0.39 inches)
Identifying Colors: red; brown; white; tan
Additional Descriptors: biting, venomous, fast

North American Territorial Reach (Though Not Limited To): Alabama; Alaska; Arizona; Arkansas; California; Colorado; Connecticut; Delaware; 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; Alberta; British Columbia; Manitoba; New Brunswick; Newfoundland and Labrador; Nova Scotia; Ontario; Prince Edward Island; Quebec; Saskatchewan; Mexico

A Note About Territorial Reach: Keep in mind that 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. Insects are driven by environmental factors, food supplies and mating patterns and do not nescessarily work within hard-and-fast territorial lines like we humans do.

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