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Long-Legged Sac Spider (Cheiracanthuim mildei)

Detailing the identifying qualities of the Long-Legged Sac Spider, including physical features and territorial reach.

 Updated: 1/23/2014; Authored By Staff Writer; Content ¬©

  Long-Legged Sac Spider  
Picture of Long-legged-Sac-Spider
Picture of Long-legged-Sac-Spider Picture of Long-legged-Sac-Spider

The commonly seen Long-Legged Sac Spider is best admired from a distance. Their bites can be a bit painful.

This pale spider is typically found in homes and offices (on ceilings, in corners, under beds, etc). They build thin silk tent-like shelters in these corners and dark spaces. The Long-Legged Sac Spider is a fast runner because it is an ambush predator. The silk shelters are not for ensnaring prey, but for resting. Its non-lethal venomous bite is painful humans and can be slow to heal.

Its thorax is darker than its abdomen. The abdomen has a center line marking that starts thicker at the 'waist' and tapers off before getting halfway down the abdomen. They are somewhat translucent and can range from a dark yellow to almost pale green or white.

Picture of the Long-Legged Sac Spider
Picture of the Long-Legged Sac Spider

Long-Legged Sac Spider Information

Category: Spider
Common Name: Long-Legged Sac Spider
Scientific Name: Cheiracanthuim mildei

Taxonomy Hierarchy

 Arrow graphic Kingdom: Animalia
  Arrow graphic Phylum: Arthropoda
   Arrow graphic Class: Arachnida
    Arrow graphic Order: Araneae
     Arrow graphic Family: Miturgidae
      Arrow graphic Genus: Cheiracanthuim
       Arrow graphic Species: mildei

Size, Identifying Tags and Territorial Reach

Size (Adult, Length): Size (Adult, Length): 5 mm to 9 mm (0.195 inches to 0.351 inches)
Identifying Colors: white; cream; tan; yellow
Additional Descriptors: fast, albino, biting, venomous

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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